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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