[857] | 1 | #ifndef LOCAL_TIME_LOCAL_DATE_TIME_HPP__
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| 2 | #define LOCAL_TIME_LOCAL_DATE_TIME_HPP__
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| 3 |
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| 4 | /* Copyright (c) 2003-2004 CrystalClear Software, Inc.
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| 5 | * Subject to the Boost Software License, Version 1.0.
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| 6 | * (See accompanying file LICENSE-1.0 or http://www.boost.org/LICENSE-1.0)
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| 7 | * Author: Jeff Garland, Bart Garst
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| 8 | * $Date: 2005/05/15 21:21:00 $
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| 9 | */
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| 10 |
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| 11 |
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| 12 | #include "boost/date_time/time.hpp"
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| 13 | #include "boost/date_time/posix_time/posix_time.hpp" //todo remove?
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| 14 | #include "boost/shared_ptr.hpp"
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| 15 | #include "boost/date_time/dst_rules.hpp"
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| 16 | #include "boost/date_time/time_zone_base.hpp"
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| 17 | #include "boost/date_time/special_defs.hpp"
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| 18 | #include <string>
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| 19 | #include <sstream>
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| 20 |
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| 21 | namespace boost {
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| 22 | namespace local_time {
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| 23 |
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| 24 | //! simple exception for reporting when STD or DST cannot be determined
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| 25 | struct ambiguous_result : public std::logic_error
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| 26 | {
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| 27 | ambiguous_result (std::string _msg="") :
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| 28 | std::logic_error(std::string("Daylight Savings Results are ambiguous: " + _msg)) {}
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| 29 | };
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| 30 | //! simple exception for when time label given cannot exist
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| 31 | struct time_label_invalid : public std::logic_error
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| 32 | {
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| 33 | time_label_invalid (std::string _msg="") :
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| 34 | std::logic_error(std::string("Time label given is invalid: " + _msg)) {}
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| 35 | };
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| 36 | struct dst_not_valid: public std::logic_error
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| 37 | {
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| 38 | dst_not_valid(std::string _msg="") :
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| 39 | std::logic_error(std::string("is_dst flag does not match resulting dst for time label given: " + _msg)) {}
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| 40 | };
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| 41 |
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| 42 | //TODO: I think these should be in local_date_time_base and not
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| 43 | // necessarily brought into the namespace
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| 44 | using date_time::time_is_dst_result;
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| 45 | using date_time::is_in_dst;
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| 46 | using date_time::is_not_in_dst;
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| 47 | using date_time::ambiguous;
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| 48 | using date_time::invalid_time_label;
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| 49 |
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| 50 | //! Representation of "wall-clock" time in a particular time zone
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| 51 | /*! Representation of "wall-clock" time in a particular time zone
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| 52 | * Local_date_time_base holds a time value (date and time offset from 00:00)
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| 53 | * along with a time zone. The time value is stored as UTC and conversions
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| 54 | * to wall clock time are made as needed. This approach allows for
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| 55 | * operations between wall-clock times in different time zones, and
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| 56 | * daylight savings time considerations, to be made. Time zones are
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| 57 | * required to be in the form of a boost::shared_ptr<time_zone_base>.
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| 58 | */
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| 59 | template<class utc_time_=posix_time::ptime,
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| 60 | class tz_type=date_time::time_zone_base<utc_time_> >
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| 61 | class local_date_time_base : public date_time::base_time<utc_time_,
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| 62 | boost::posix_time::posix_time_system> {
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| 63 | public:
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| 64 | typedef utc_time_ utc_time_type;
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| 65 | typedef typename utc_time_type::time_duration_type time_duration_type;
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| 66 | typedef typename utc_time_type::date_type date_type;
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| 67 | typedef typename date_type::duration_type date_duration_type;
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| 68 | typedef typename utc_time_type::time_system_type time_system_type;
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| 69 | /*! This constructor interprets the passed time as a UTC time.
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| 70 | * So, for example, if the passed timezone is UTC-5 then the
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| 71 | * time will be adjusted back 5 hours. The time zone allows for
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| 72 | * automatic calculation of whether the particular time is adjusted for
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| 73 | * daylight savings, etc.
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| 74 | * If the time zone shared pointer is null then time stays unadjusted.
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| 75 | *@param t A UTC time
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| 76 | *@param tz Timezone for to adjust the UTC time to.
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| 77 | */
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| 78 | local_date_time_base(utc_time_type t,
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| 79 | boost::shared_ptr<tz_type> tz) :
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| 80 | date_time::base_time<utc_time_type, time_system_type>(t),
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| 81 | zone_(tz)
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| 82 | {
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| 83 | // param was already utc so nothing more to do
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| 84 | }
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| 85 |
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| 86 | /*! This constructs a local time -- the passed time information
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| 87 | * understood to be in the passed tz. The DST flag must be passed
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| 88 | * to indicate whether the time is in daylight savings or not.
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| 89 | * @throws -- time_label_invalid if the time passed does not exist in
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| 90 | * the given locale. The non-existent case occurs typically
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| 91 | * during the shift-back from daylight savings time. When
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| 92 | * the clock is shifted forward a range of times
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| 93 | * (2 am to 3 am in the US) is skipped and hence is invalid.
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| 94 | * @throws -- dst_not_valid if the DST flag is passed for a period
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| 95 | * where DST is not active.
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| 96 | */
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| 97 | local_date_time_base(date_type d,
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| 98 | time_duration_type td,
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| 99 | boost::shared_ptr<tz_type> tz,
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| 100 | bool dst_flag) : //necessary for constr_adj()
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| 101 | date_time::base_time<utc_time_type,time_system_type>(construction_adjustment(utc_time_type(d, td), tz, dst_flag)),
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| 102 | zone_(tz)
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| 103 | {
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| 104 | if(tz != boost::shared_ptr<tz_type>() && tz->has_dst()){
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| 105 |
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| 106 | // d & td are already local so we use them
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| 107 | time_is_dst_result result = check_dst(d, td, tz);
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| 108 | bool in_dst = (result == is_in_dst); // less processing than is_dst()
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| 109 |
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| 110 | // ambig occurs at end, invalid at start
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| 111 | if(result == invalid_time_label){
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| 112 | // Ex: 2:15am local on trans-in day in nyc, dst_flag irrelevant
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| 113 | std::stringstream ss;
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| 114 | ss << "time given: " << d << ' ' << td;
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| 115 | throw time_label_invalid(ss.str());
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| 116 | }
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| 117 | else if(result != ambiguous && in_dst != dst_flag){
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| 118 | // is dst_flag accurate?
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| 119 | // Ex: false flag in NYC in June
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| 120 | std::stringstream ss;
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| 121 | ss << "flag given: " << (dst_flag ? "dst=true" : "dst=false")
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| 122 | << ", dst calculated: " << (in_dst ? "dst=true" : "dst=false");
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| 123 | throw dst_not_valid(ss.str());
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| 124 | }
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| 125 |
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| 126 | // everything checks out and conversion to utc already done
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| 127 | }
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| 128 | }
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| 129 |
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| 130 | //TODO maybe not the right set...Ignore the last 2 for now...
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| 131 | enum DST_CALC_OPTIONS { EXCEPTION_ON_ERROR, NOT_DATE_TIME_ON_ERROR };
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| 132 | //ASSUME_DST_ON_ERROR, ASSUME_NOT_DST_ON_ERROR };
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| 133 |
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| 134 | /*! This constructs a local time -- the passed time information
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| 135 | * understood to be in the passed tz. The DST flag is calculated
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| 136 | * according to the specified rule.
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| 137 | */
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| 138 | local_date_time_base(date_type d,
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| 139 | time_duration_type td,
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| 140 | boost::shared_ptr<tz_type> tz,
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| 141 | DST_CALC_OPTIONS calc_option) :
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| 142 | // dummy value - time_ is set in constructor code
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| 143 | date_time::base_time<utc_time_type,time_system_type>(utc_time_type(d,td)),
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| 144 | zone_(tz)
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| 145 | {
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| 146 | time_is_dst_result result = check_dst(d, td, tz);
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| 147 | if(result == ambiguous) {
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| 148 | if(calc_option == EXCEPTION_ON_ERROR){
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| 149 | std::stringstream ss;
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| 150 | ss << "time given: " << d << ' ' << td;
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| 151 | throw ambiguous_result(ss.str());
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| 152 | }
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| 153 | else{ // NADT on error
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| 154 | this->time_ = posix_time::posix_time_system::get_time_rep(date_type(date_time::not_a_date_time), time_duration_type(date_time::not_a_date_time));
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| 155 | }
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| 156 | }
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| 157 | else if(result == invalid_time_label){
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| 158 | if(calc_option == EXCEPTION_ON_ERROR){
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| 159 | std::stringstream ss;
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| 160 | ss << "time given: " << d << ' ' << td;
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| 161 | throw time_label_invalid(ss.str());
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| 162 | }
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| 163 | else{ // NADT on error
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| 164 | this->time_ = posix_time::posix_time_system::get_time_rep(date_type(date_time::not_a_date_time), time_duration_type(date_time::not_a_date_time));
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| 165 | }
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| 166 | }
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| 167 | else if(result == is_in_dst){
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| 168 | utc_time_type t =
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| 169 | construction_adjustment(utc_time_type(d, td), tz, true);
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| 170 | this->time_ = posix_time::posix_time_system::get_time_rep(t.date(),
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| 171 | t.time_of_day());
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| 172 | }
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| 173 | else{
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| 174 | utc_time_type t =
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| 175 | construction_adjustment(utc_time_type(d, td), tz, false);
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| 176 | this->time_ = posix_time::posix_time_system::get_time_rep(t.date(),
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| 177 | t.time_of_day());
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| 178 | }
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| 179 | }
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| 180 |
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| 181 |
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| 182 | //! Determines if given time label is in daylight savings for given zone
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| 183 | /*! Determines if given time label is in daylight savings for given zone.
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| 184 | * Takes a date and time_duration representing a local time, along
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| 185 | * with time zone, and returns a time_is_dst_result object as result.
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| 186 | */
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| 187 | static time_is_dst_result check_dst(date_type d,
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| 188 | time_duration_type td,
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| 189 | boost::shared_ptr<tz_type> tz)
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| 190 | {
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| 191 | if(tz != boost::shared_ptr<tz_type>() && tz->has_dst()) {
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| 192 | typedef typename date_time::dst_calculator<date_type, time_duration_type> dst_calculator;
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| 193 | return dst_calculator::local_is_dst(
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| 194 | d, td,
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| 195 | tz->dst_local_start_time(d.year()).date(),
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| 196 | tz->dst_local_start_time(d.year()).time_of_day(),
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| 197 | tz->dst_local_end_time(d.year()).date(),
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| 198 | tz->dst_local_end_time(d.year()).time_of_day(),
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| 199 | tz->dst_offset()
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| 200 | );
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| 201 | }
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| 202 | else{
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| 203 | return is_not_in_dst;
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| 204 | }
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| 205 | }
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| 206 |
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| 207 | //! Simple destructor, releases time zone if last referrer
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| 208 | ~local_date_time_base() {};
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| 209 |
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| 210 | //! Copy constructor
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| 211 | local_date_time_base(const local_date_time_base& rhs) :
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| 212 | date_time::base_time<utc_time_type, time_system_type>(rhs),
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| 213 | zone_(rhs.zone_)
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| 214 | {}
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| 215 |
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| 216 | //! Special values constructor
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| 217 | explicit local_date_time_base(const boost::date_time::special_values sv,
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| 218 | boost::shared_ptr<tz_type> tz = boost::shared_ptr<tz_type>()) :
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| 219 | date_time::base_time<utc_time_type, time_system_type>(utc_time_type(sv)),
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| 220 | zone_(tz)
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| 221 | {}
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| 222 |
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| 223 | //! returns time zone associated with calling instance
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| 224 | boost::shared_ptr<tz_type> zone() const
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| 225 | {
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| 226 | return zone_;
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| 227 | }
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| 228 | //! returns false is time_zone is NULL and if time value is a special_value
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| 229 | bool is_dst() const
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| 230 | {
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| 231 | if(zone_ != boost::shared_ptr<tz_type>() && zone_->has_dst() && !this->is_special()) {
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| 232 | // check_dst takes a local time, *this is utc
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| 233 | utc_time_type lt(this->time_);
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| 234 | lt += zone_->base_utc_offset();
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| 235 | // dst_offset only needs to be considered with ambiguous time labels
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| 236 | // make that adjustment there
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| 237 |
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| 238 | switch(check_dst(lt.date(), lt.time_of_day(), zone_)){
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| 239 | case is_not_in_dst:
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| 240 | return false;
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| 241 | case is_in_dst:
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| 242 | return true;
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| 243 | case ambiguous:
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| 244 | if(lt + zone_->dst_offset() < zone_->dst_local_end_time(lt.date().year())) {
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| 245 | return true;
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| 246 | }
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| 247 | break;
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| 248 | case invalid_time_label:
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| 249 | if(lt >= zone_->dst_local_start_time(lt.date().year())) {
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| 250 | return true;
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| 251 | }
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| 252 | break;
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| 253 | }
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| 254 | }
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| 255 | return false;
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| 256 | }
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| 257 | //! Returns object's time value as a utc representation
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| 258 | utc_time_type utc_time() const
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| 259 | {
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| 260 | return utc_time_type(this->time_);
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| 261 | }
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| 262 | //! Returns object's time value as a local representation
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| 263 | utc_time_type local_time() const
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| 264 | {
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| 265 | if(zone_ != boost::shared_ptr<tz_type>()){
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| 266 | utc_time_type lt = this->utc_time() + zone_->base_utc_offset();
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| 267 | if (is_dst()) {
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| 268 | lt += zone_->dst_offset();
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| 269 | }
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| 270 | return lt;
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| 271 | }
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| 272 | return utc_time_type(this->time_);
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| 273 | }
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| 274 | //! Returns string in the form "2003-Aug-20 05:00:00 EDT"
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| 275 | /*! Returns string in the form "2003-Aug-20 05:00:00 EDT". If
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| 276 | * time_zone is NULL the time zone abbreviation will be "UTC". The time
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| 277 | * zone abbrev will not be included if calling object is a special_value*/
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| 278 | std::string to_string() const
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| 279 | {
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| 280 | //TODO is this a temporary function ???
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| 281 | std::stringstream ss;
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| 282 | if(this->is_special()){
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| 283 | ss << utc_time();
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| 284 | return ss.str();
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| 285 | }
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| 286 | if(zone_ == boost::shared_ptr<tz_type>()) {
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| 287 | ss << utc_time() << " UTC";
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| 288 | return ss.str();
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| 289 | }
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| 290 | bool is_dst_ = is_dst();
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| 291 | utc_time_type lt = this->utc_time() + zone_->base_utc_offset();
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| 292 | if (is_dst_) {
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| 293 | lt += zone_->dst_offset();
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| 294 | }
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| 295 | ss << local_time() << " ";
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| 296 | if (is_dst()) {
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| 297 | ss << zone_->dst_zone_abbrev();
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| 298 | }
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| 299 | else {
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| 300 | ss << zone_->std_zone_abbrev();
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| 301 | }
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| 302 | return ss.str();
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| 303 | }
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| 304 | /*! returns a local_date_time_base in the given time zone with the
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| 305 | * optional time_duration added. */
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| 306 | local_date_time_base local_time_in(boost::shared_ptr<tz_type> new_tz,
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| 307 | time_duration_type td=time_duration_type(0,0,0)) const
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| 308 | {
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| 309 | return local_date_time_base(utc_time_type(this->time_) + td, new_tz);
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| 310 | }
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| 311 |
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| 312 | //! Returns name of associated time zone or "Coordinated Universal Time".
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| 313 | /*! Optional bool parameter will return time zone as an offset
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| 314 | * (ie "+07:00" extended iso format). Empty string is returned for
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| 315 | * classes that do not use a time_zone */
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| 316 | std::string zone_name(bool as_offset=false) const
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| 317 | {
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| 318 | if(zone_ == boost::shared_ptr<tz_type>()) {
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| 319 | if(as_offset) {
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| 320 | return std::string("Z");
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| 321 | }
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| 322 | else {
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| 323 | return std::string("Coordinated Universal Time");
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| 324 | }
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| 325 | }
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| 326 | if (is_dst()) {
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| 327 | if(as_offset) {
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| 328 | time_duration_type td = zone_->base_utc_offset();
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| 329 | td += zone_->dst_offset();
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| 330 | return zone_as_offset(td, ":");
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| 331 | }
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| 332 | else {
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| 333 | return zone_->dst_zone_name();
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| 334 | }
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| 335 | }
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| 336 | else {
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| 337 | if(as_offset) {
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| 338 | time_duration_type td = zone_->base_utc_offset();
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| 339 | return zone_as_offset(td, ":");
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| 340 | }
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| 341 | else {
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| 342 | return zone_->std_zone_name();
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| 343 | }
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| 344 | }
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| 345 | }
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| 346 | //! Returns abbreviation of associated time zone or "UTC".
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| 347 | /*! Optional bool parameter will return time zone as an offset
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| 348 | * (ie "+0700" iso format). Empty string is returned for classes
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| 349 | * that do not use a time_zone */
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| 350 | std::string zone_abbrev(bool as_offset=false) const
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| 351 | {
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| 352 | if(zone_ == boost::shared_ptr<tz_type>()) {
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| 353 | if(as_offset) {
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| 354 | return std::string("Z");
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| 355 | }
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| 356 | else {
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| 357 | return std::string("UTC");
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| 358 | }
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| 359 | }
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| 360 | if (is_dst()) {
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| 361 | if(as_offset) {
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| 362 | time_duration_type td = zone_->base_utc_offset();
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| 363 | td += zone_->dst_offset();
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| 364 | return zone_as_offset(td, "");
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| 365 | }
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| 366 | else {
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| 367 | return zone_->dst_zone_abbrev();
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| 368 | }
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| 369 | }
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| 370 | else {
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| 371 | if(as_offset) {
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| 372 | time_duration_type td = zone_->base_utc_offset();
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| 373 | return zone_as_offset(td, "");
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| 374 | }
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| 375 | else {
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| 376 | return zone_->std_zone_abbrev();
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| 377 | }
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| 378 | }
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| 379 | }
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| 380 |
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| 381 | //! returns a posix_time_zone string for the associated time_zone. If no time_zone, "UTC+00" is returned.
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| 382 | std::string zone_as_posix_string() const
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| 383 | {
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| 384 | if(zone_ == shared_ptr<tz_type>()) {
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| 385 | return std::string("UTC+00");
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| 386 | }
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| 387 | return zone_->to_posix_string();
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| 388 | }
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| 389 |
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| 390 | //! Equality comparison operator
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| 391 | /*bool operator==(const date_time::base_time<boost::posix_time::ptime,boost::posix_time::posix_time_system>& rhs) const
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| 392 | { // fails due to rhs.time_ being protected
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| 393 | return date_time::base_time<boost::posix_time::ptime,boost::posix_time::posix_time_system>::operator==(rhs);
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| 394 | //return this->time_ == rhs.time_;
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| 395 | }*/
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| 396 | //! Equality comparison operator
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| 397 | bool operator==(const local_date_time_base& rhs) const
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| 398 | {
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| 399 | return time_system_type::is_equal(this->time_, rhs.time_);
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| 400 | }
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| 401 | //! Non-Equality comparison operator
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| 402 | bool operator!=(const local_date_time_base& rhs) const
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| 403 | {
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| 404 | return !(*this == rhs);
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| 405 | }
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| 406 | //! Less than comparison operator
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| 407 | bool operator<(const local_date_time_base& rhs) const
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| 408 | {
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| 409 | return time_system_type::is_less(this->time_, rhs.time_);
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| 410 | }
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| 411 | //! Less than or equal to comparison operator
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| 412 | bool operator<=(const local_date_time_base& rhs) const
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| 413 | {
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| 414 | return (*this < rhs || *this == rhs);
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| 415 | }
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| 416 | //! Greater than comparison operator
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| 417 | bool operator>(const local_date_time_base& rhs) const
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| 418 | {
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| 419 | return !(*this <= rhs);
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| 420 | }
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| 421 | //! Greater than or equal to comparison operator
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| 422 | bool operator>=(const local_date_time_base& rhs) const
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| 423 | {
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| 424 | return (*this > rhs || *this == rhs);
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| 425 | }
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| 426 |
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| 427 | //! Local_date_time + date_duration
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| 428 | local_date_time_base operator+(const date_duration_type& dd) const
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| 429 | {
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| 430 | return local_date_time_base(time_system_type::add_days(this->time_,dd), zone_);
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| 431 | }
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| 432 | //! Local_date_time += date_duration
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| 433 | local_date_time_base operator+=(const date_duration_type& dd)
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| 434 | {
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| 435 | this->time_ = time_system_type::add_days(this->time_,dd);
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| 436 | return *this;
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| 437 | }
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| 438 | //! Local_date_time - date_duration
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| 439 | local_date_time_base operator-(const date_duration_type& dd) const
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| 440 | {
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| 441 | return local_date_time_base(time_system_type::subtract_days(this->time_,dd), zone_);
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| 442 | }
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| 443 | //! Local_date_time -= date_duration
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| 444 | local_date_time_base operator-=(const date_duration_type& dd)
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| 445 | {
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| 446 | this->time_ = time_system_type::subtract_days(this->time_,dd);
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| 447 | return *this;
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| 448 | }
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| 449 | //! Local_date_time + time_duration
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| 450 | local_date_time_base operator+(const time_duration_type& td) const
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| 451 | {
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| 452 | return local_date_time_base(time_system_type::add_time_duration(this->time_,td), zone_);
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| 453 | }
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| 454 | //! Local_date_time += time_duration
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| 455 | local_date_time_base operator+=(const time_duration_type& td)
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| 456 | {
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| 457 | this->time_ = time_system_type::add_time_duration(this->time_,td);
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| 458 | return *this;
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| 459 | }
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| 460 | //! Local_date_time - time_duration
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| 461 | local_date_time_base operator-(const time_duration_type& td) const
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| 462 | {
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| 463 | return local_date_time_base(time_system_type::subtract_time_duration(this->time_,td), zone_);
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| 464 | }
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| 465 | //! Local_date_time -= time_duration
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| 466 | local_date_time_base operator-=(const time_duration_type& td)
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| 467 | {
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| 468 | this->time_ = time_system_type::subtract_time_duration(this->time_,td);
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| 469 | return *this;
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| 470 | }
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| 471 | //! local_date_time -= local_date_time --> time_duration_type
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| 472 | time_duration_type operator-(const local_date_time_base& rhs) const
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| 473 | {
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| 474 | return utc_time_type(this->time_) - utc_time_type(rhs.time_);
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| 475 | }
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| 476 | private:
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| 477 | boost::shared_ptr<tz_type> zone_;
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| 478 | //bool is_dst_;
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| 479 |
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| 480 | /*! Adjust the passed in time to UTC?
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| 481 | */
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| 482 | utc_time_type construction_adjustment(utc_time_type t,
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| 483 | boost::shared_ptr<tz_type> zone,
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| 484 | bool is_dst)
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| 485 | {
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| 486 | if(zone != boost::shared_ptr<tz_type>()) {
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| 487 | if(is_dst && zone->has_dst()) {
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| 488 | t -= zone->dst_offset();
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| 489 | } // else no adjust
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| 490 | t -= zone->base_utc_offset();
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| 491 | }
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| 492 | return t;
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| 493 | }
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| 494 |
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| 495 | /*! Simple formatting code -- todo remove this?
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| 496 | */
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| 497 | std::string zone_as_offset(const time_duration_type& td,
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| 498 | const std::string& separator) const
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| 499 | {
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| 500 | std::stringstream ss;
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| 501 | if(td.is_negative()) {
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| 502 | // a negative duration is represented as "-[h]h:mm"
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| 503 | // we require two digits for the hour. A positive duration
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| 504 | // with the %H flag will always give two digits
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| 505 | ss << "-";
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| 506 | }
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| 507 | else {
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| 508 | ss << "+";
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| 509 | }
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| 510 | ss << std::setw(2) << std::setfill('0')
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| 511 | << date_time::absolute_value(td.hours())
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| 512 | << separator
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| 513 | << std::setw(2) << std::setfill('0')
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| 514 | << date_time::absolute_value(td.minutes());
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| 515 | return ss.str();
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| 516 | }
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| 517 | };
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| 518 |
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| 519 | //!Use the default parameters to define local_date_time
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| 520 | typedef local_date_time_base<> local_date_time;
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| 521 |
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| 522 | } }
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| 523 |
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| 524 |
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| 525 | #endif
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