[857] | 1 | /* Copyright (c) 2002,2003 CrystalClear Software, Inc.
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| 2 | * Use, modification and distribution is subject to the
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| 3 | * Boost Software License, Version 1.0. (See accompanying
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| 4 | * file LICENSE-1.0 or http://www.boost.org/LICENSE-1.0)
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| 5 | * Author: Jeff Garland, Bart Garst
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| 6 | * $Date: 2003/12/03 02:28:02 $
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| 7 | */
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| 8 |
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| 9 | #ifndef NO_BOOST_DATE_TIME_INLINE
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| 10 | #undef BOOST_DATE_TIME_INLINE
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| 11 | #define BOOST_DATE_TIME_INLINE inline
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| 12 | #endif
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| 13 |
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| 14 | namespace boost {
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| 15 | namespace date_time {
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| 16 | //! Return the day of the week (0==Sunday, 1==Monday, etc)
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| 17 | /*! Converts a the year-month-day into a day of the week number
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| 18 | */
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| 19 | template<typename ymd_type_, typename date_int_type_>
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| 20 | BOOST_DATE_TIME_INLINE
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| 21 | unsigned short
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| 22 | gregorian_calendar_base<ymd_type_,date_int_type_>::day_of_week(const ymd_type& ymd) {
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| 23 | unsigned short a = static_cast<unsigned short>((14-ymd.month)/12);
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| 24 | unsigned short y = static_cast<unsigned short>(ymd.year - a);
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| 25 | unsigned short m = static_cast<unsigned short>(ymd.month + 12*a - 2);
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| 26 | unsigned short d = static_cast<unsigned short>((ymd.day + y + (y/4) - (y/100) + (y/400) + (31*m)/12) % 7);
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| 27 | //std::cout << year << "-" << month << "-" << day << " is day: " << d << "\n";
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| 28 | return d;
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| 29 | }
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| 30 |
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| 31 | //!Return the iso week number for the date
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| 32 | /*!Implements the rules associated with the iso 8601 week number.
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| 33 | Basically the rule is that Week 1 of the year is the week that contains
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| 34 | January 4th or the week that contains the first Thursday in January.
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| 35 | Reference for this algorithm is the Calendar FAQ by Claus Tondering, April 2000.
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| 36 | */
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| 37 | template<typename ymd_type_, typename date_int_type_>
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| 38 | BOOST_DATE_TIME_INLINE
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| 39 | int
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| 40 | gregorian_calendar_base<ymd_type_,date_int_type_>::week_number(const ymd_type& ymd) {
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| 41 | unsigned long julianbegin = julian_day_number(ymd_type(ymd.year,1,1));
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| 42 | unsigned long juliantoday = julian_day_number(ymd);
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| 43 | unsigned long day = (julianbegin + 3) % 7;
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| 44 | unsigned long week = (juliantoday + day - julianbegin + 4)/7;
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| 45 |
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| 46 | if ((week >= 1) && (week <= 52)) {
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| 47 | return week;
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| 48 | }
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| 49 |
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| 50 | if ((week == 53)) {
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| 51 | if((day==6) ||(day == 5 && is_leap_year(ymd.year))) {
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| 52 | return week; //under these circumstances week == 53.
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| 53 | } else {
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| 54 | return 1; //monday - wednesday is in week 1 of next year
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| 55 | }
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| 56 | }
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| 57 | //if the week is not in current year recalculate using the previous year as the beginning year
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| 58 | else if (week == 0) {
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| 59 | julianbegin = julian_day_number(ymd_type(static_cast<unsigned short>(ymd.year-1),1,1));
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| 60 | juliantoday = julian_day_number(ymd);
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| 61 | day = (julianbegin + 3) % 7;
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| 62 | week = (juliantoday + day - julianbegin + 4)/7;
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| 63 | return week;
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| 64 | }
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| 65 |
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| 66 | return week; //not reachable -- well except if day == 5 and is_leap_year != true
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| 67 |
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| 68 | }
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| 69 |
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| 70 | //! Convert a ymd_type into a day number
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| 71 | /*! The day number is an absolute number of days since the start of count
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| 72 | */
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| 73 | template<typename ymd_type_, typename date_int_type_>
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| 74 | BOOST_DATE_TIME_INLINE
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| 75 | date_int_type_
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| 76 | gregorian_calendar_base<ymd_type_,date_int_type_>::day_number(const ymd_type& ymd)
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| 77 | {
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| 78 | unsigned short a = static_cast<unsigned short>((14-ymd.month)/12);
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| 79 | unsigned short y = static_cast<unsigned short>(ymd.year + 4800 - a);
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| 80 | unsigned short m = static_cast<unsigned short>(ymd.month + 12*a - 3);
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| 81 | unsigned long d = ymd.day + ((153*m + 2)/5) + 365*y + (y/4) - (y/100) + (y/400) - 32045;
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| 82 | return d;
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| 83 | }
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| 84 |
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| 85 | //! Convert a year-month-day into the julian day number
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| 86 | /*! Since this implementation uses julian day internally, this is the same as the day_number.
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| 87 | */
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| 88 | template<typename ymd_type_, typename date_int_type_>
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| 89 | BOOST_DATE_TIME_INLINE
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| 90 | date_int_type_
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| 91 | gregorian_calendar_base<ymd_type_,date_int_type_>::julian_day_number(const ymd_type& ymd)
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| 92 | {
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| 93 | return day_number(ymd);
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| 94 | }
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| 95 |
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| 96 | //! Convert year-month-day into a modified julian day number
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| 97 | /*! The day number is an absolute number of days.
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| 98 | * MJD 0 thus started on 17 Nov 1858(Gregorian) at 00:00:00 UTC
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| 99 | */
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| 100 | template<typename ymd_type_, typename date_int_type_>
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| 101 | BOOST_DATE_TIME_INLINE
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| 102 | long
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| 103 | gregorian_calendar_base<ymd_type_,date_int_type_>::modjulian_day_number(const ymd_type& ymd)
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| 104 | {
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| 105 | return julian_day_number(ymd)-2400001; //prerounded
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| 106 | }
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| 107 |
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| 108 | //! Change a day number into a year-month-day
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| 109 | template<typename ymd_type_, typename date_int_type_>
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| 110 | BOOST_DATE_TIME_INLINE
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| 111 | ymd_type_
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| 112 | gregorian_calendar_base<ymd_type_,date_int_type_>::from_day_number(date_int_type dayNumber)
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| 113 | {
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| 114 | date_int_type a = dayNumber + 32044;
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| 115 | date_int_type b = (4*a + 3)/146097;
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| 116 | date_int_type c = a-((146097*b)/4);
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| 117 | date_int_type d = (4*c + 3)/1461;
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| 118 | date_int_type e = c - (1461*d)/4;
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| 119 | date_int_type m = (5*e + 2)/153;
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| 120 | unsigned short day = static_cast<unsigned short>(e - ((153*m + 2)/5) + 1);
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| 121 | unsigned short month = static_cast<unsigned short>(m + 3 - 12 * (m/10));
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| 122 | year_type year = static_cast<unsigned short>(100*b + d - 4800 + (m/10));
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| 123 | //std::cout << year << "-" << month << "-" << day << "\n";
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| 124 |
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| 125 | return ymd_type(static_cast<unsigned short>(year),month,day);
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| 126 | }
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| 127 |
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| 128 | //! Change a day number into a year-month-day
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| 129 | template<typename ymd_type_, typename date_int_type_>
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| 130 | BOOST_DATE_TIME_INLINE
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| 131 | ymd_type_
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| 132 | gregorian_calendar_base<ymd_type_,date_int_type_>::from_julian_day_number(date_int_type dayNumber)
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| 133 | {
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| 134 | date_int_type a = dayNumber + 32044;
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| 135 | date_int_type b = (4*a+3)/146097;
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| 136 | date_int_type c = a - ((146097*b)/4);
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| 137 | date_int_type d = (4*c + 3)/1461;
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| 138 | date_int_type e = c - ((1461*d)/4);
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| 139 | date_int_type m = (5*e + 2)/153;
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| 140 | unsigned short day = static_cast<unsigned short>(e - ((153*m + 2)/5) + 1);
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| 141 | unsigned short month = static_cast<unsigned short>(m + 3 - 12 * (m/10));
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| 142 | year_type year = static_cast<year_type>(100*b + d - 4800 + (m/10));
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| 143 | //std::cout << year << "-" << month << "-" << day << "\n";
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| 144 |
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| 145 | return ymd_type(year,month,day);
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| 146 | }
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| 147 |
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| 148 | //! Change a modified julian day number into a year-month-day
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| 149 | template<typename ymd_type_, typename date_int_type_>
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| 150 | BOOST_DATE_TIME_INLINE
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| 151 | ymd_type_
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| 152 | gregorian_calendar_base<ymd_type_,date_int_type_>::from_modjulian_day_number(long dayNumber) {
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| 153 | date_int_type jd = dayNumber + 2400001; //is 2400000.5 prerounded
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| 154 | return from_julian_day_number(jd);
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| 155 | }
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| 156 |
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| 157 | //! Determine if the provided year is a leap year
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| 158 | /*!
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| 159 | *@return true if year is a leap year, false otherwise
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| 160 | */
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| 161 | template<typename ymd_type_, typename date_int_type_>
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| 162 | BOOST_DATE_TIME_INLINE
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| 163 | bool
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| 164 | gregorian_calendar_base<ymd_type_,date_int_type_>::is_leap_year(year_type year)
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| 165 | {
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| 166 | //divisible by 4, not if divisible by 100, but true if divisible by 400
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| 167 | return (!(year % 4)) && ((year % 100) || (!(year % 400)));
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| 168 | }
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| 169 |
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| 170 | //! Calculate the last day of the month
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| 171 | /*! Find the day which is the end of the month given year and month
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| 172 | * No error checking is performed.
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| 173 | */
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| 174 | template<typename ymd_type_, typename date_int_type_>
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| 175 | BOOST_DATE_TIME_INLINE
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| 176 | unsigned short
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| 177 | gregorian_calendar_base<ymd_type_,date_int_type_>::end_of_month_day(year_type year,
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| 178 | month_type month)
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| 179 | {
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| 180 | switch (month) {
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| 181 | case 2:
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| 182 | if (is_leap_year(year)) {
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| 183 | return 29;
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| 184 | } else {
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| 185 | return 28;
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| 186 | };
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| 187 | case 4:
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| 188 | case 6:
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| 189 | case 9:
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| 190 | case 11:
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| 191 | return 30;
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| 192 | default:
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| 193 | return 31;
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| 194 | };
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| 195 |
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| 196 | }
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| 197 |
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| 198 | //! Provide the ymd_type specification for the calandar start
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| 199 | template<typename ymd_type_, typename date_int_type_>
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| 200 | BOOST_DATE_TIME_INLINE
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| 201 | ymd_type_
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| 202 | gregorian_calendar_base<ymd_type_,date_int_type_>::epoch()
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| 203 | {
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| 204 | return ymd_type(1400,1,1);
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| 205 | }
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| 206 |
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| 207 | //! Defines length of a week for week calculations
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| 208 | template<typename ymd_type_, typename date_int_type_>
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| 209 | BOOST_DATE_TIME_INLINE
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| 210 | unsigned short
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| 211 | gregorian_calendar_base<ymd_type_,date_int_type_>::days_in_week()
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| 212 | {
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| 213 | return 7;
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| 214 | }
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| 215 |
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| 216 |
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| 217 | } } //namespace gregorian
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| 218 |
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| 219 |
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