lotuswordpro/source/filter/localtime.cxx

   1 /*************************************************************************
   2  *
   3  *  The Contents of this file are made available subject to the terms of
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   5  *
   6  *         - GNU Lesser General Public License Version 2.1
   7  *         - Sun Industry Standards Source License Version 1.1
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   9  *  Sun Microsystems Inc., October, 2000
  10  *
  11  *  GNU Lesser General Public License Version 2.1
  12  *  =============================================
  13  *  Copyright 2000 by Sun Microsystems, Inc.
  14  *  901 San Antonio Road, Palo Alto, CA 94303, USA
  15  *
  16  *  This library is free software; you can redistribute it and/or
  17  *  modify it under the terms of the GNU Lesser General Public
  18  *  License version 2.1, as published by the Free Software Foundation.
  19  *
  20  *  This library is distributed in the hope that it will be useful,
  21  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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  23  *  Lesser General Public License for more details.
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  25  *  You should have received a copy of the GNU Lesser General Public
  26  *  License along with this library; if not, write to the Free Software
  27  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  28  *  MA  02111-1307  USA
  29  *
  30  *
  31  *  Sun Industry Standards Source License Version 1.1
  32  *  =================================================
  33  *  The contents of this file are subject to the Sun Industry Standards
  34  *  Source License Version 1.1 (the "License"); You may not use this file
  35  *  except in compliance with the License. You may obtain a copy of the
  36  *  License at http://www.openoffice.org/license.html.
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  45  *  The Initial Developer of the Original Code is: IBM Corporation
  46  *
  47  *  Copyright: 2008 by IBM Corporation
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  49  *  All Rights Reserved.
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  51  *  Contributor(s): _______________________________________
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  53  *
  54  ************************************************************************/
  55 #include "localtime.hxx"
  56 #include <limits.h>
  57 #include <unicode/timezone.h>
  58 //End by
  59 const long DAY_SEC =24 * 60 * 60;
  60 const long YEAR_SEC = 365 * DAY_SEC;
  61 const long FOURYEAR_SEC = 4 * YEAR_SEC + DAY_SEC;
  62 #ifndef LONG_MAX
  63 const long LONG_MAX=2147483647;
  64 #endif
  65 const long TIMEZONE = -28800;
  66 //01-01-70 was a Thursday
  67 const long BASE_DOW = 4;
  68
  69 long _lpdays[] = {-1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365};
  70
  71 long _days[] = {-1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364};
  72
  73 bool LtgGmTime(long rtime,LtTm& rtm)
  74 {
  75         if (rtime < 0)
  76         {
  77                 return false;
  78         }
  79         //is-current-year-a-leap-year flag
  80         int islpyr = 0;
  81
  82         long tmptim;
  83         long caltim = rtime;
  84         tmptim = (long)(caltim / FOURYEAR_SEC);
  85         caltim -= ((long)tmptim * FOURYEAR_SEC);
  86
  87         //
  88         //Determine which year of the interval
  89         //
  90         // 1970, 1974, 1978,...,etc.
  91         tmptim = (tmptim * 4) + 70;
  92
  93         if (caltim >= YEAR_SEC)
  94         {
  95                 //1971, 1975, 1979,...,etc.
  96                 tmptim++;
  97                 caltim -= YEAR_SEC;
  98
  99                 if ( caltim >= YEAR_SEC )
 100                 {
 101                         // 1972, 1976, 1980,...,etc.
 102                         tmptim++;
 103                         caltim -= YEAR_SEC;
 104
 105                         //Note, it takes 366 days-worth of seconds to get past a leap year.
 106                         if (caltim >= (YEAR_SEC + DAY_SEC))
 107                         {
 108                                 //1973, 1977, 1981,...,etc.
 109                                 tmptim++;
 110                                 caltim -= (YEAR_SEC + DAY_SEC);
 111                         }
 112                         else
 113                         {
 114                                 //In a leap year after all, set the flag.
 115                                 islpyr++;
 116                         }
 117                 }
 118         }
 119
 120         //
 121         //tmptim now holds the value for tm_year. caltim now holds the
 122         //number of elapsed seconds since the beginning of that year.
 123         //
 124         rtm.tm_year = tmptim;
 125         //
 126         //Determine days since January 1 (0 - 365). This is the tm_yday value.
 127         //Leave caltim with number of elapsed seconds in that day.
 128         //
 129         rtm.tm_yday = (long)(caltim / DAY_SEC);
 130         caltim -= (long)(rtm.tm_yday) * DAY_SEC;
 131         //
 132         //Determine months since January (0 - 11) and day of month (1 - 31)
 133         //
 134         long* mdays;
 135         if ( islpyr )
 136         {
 137                 mdays = _lpdays;
 138         }
 139         else
 140         {
 141                 mdays = _days;
 142         }
 143
 144         for ( tmptim = 1 ; mdays[tmptim] < rtm.tm_yday ; tmptim++ ) ;
 145
 146         rtm.tm_mon = --tmptim;
 147
 148         rtm.tm_mday = rtm.tm_yday - mdays[tmptim];
 149
 150         //
 151         //Determine days since Sunday (0 - 6)
 152         //
 153         rtm.tm_wday = ((long)(rtime / DAY_SEC) + BASE_DOW) % 7;
 154         //
 155         //Determine hours since midnight (0 - 23), minutes after the hour
 156         //(0 - 59), and seconds after the minute (0 - 59).
 157         //
 158         rtm.tm_hour = (long)(caltim / 3600);
 159         caltim -= (long)rtm.tm_hour * 3600;
 160
 161         rtm.tm_min = (long)(caltim / 60);
 162         rtm.tm_sec = (long)(caltim - (rtm.tm_min) * 60);
 163
 164         rtm.tm_isdst = 0;
 165
 166         //
 167         //
 168         //
 169         //adjust year & month
 170         rtm.tm_year += 1900;
 171         ++(rtm.tm_mon);
 172
 173         return true;
 174
 175 };
 176 bool LtgLocalTime(long rtime,LtTm& rtm)
 177 {
 178         long ltime;
 179         if (rtime < 0)
 180         {
 181                 return false;
 182         }
 183
 184         if ((rtime > 3 * DAY_SEC)&&(rtime < LONG_MAX - 3 * DAY_SEC))
 185         {
 186                 TimeZone* pLocalZone = TimeZone::createDefault();
 187                 long offset = (pLocalZone->getRawOffset())/1000;
 188                 ltime = rtime + offset;
 189                 return LtgGmTime(ltime,rtm);
 190         }
 191         return false;
 192 };