diff options
Diffstat (limited to 'calendar/cal-util/timeutil.c')
-rw-r--r-- | calendar/cal-util/timeutil.c | 312 |
1 files changed, 0 insertions, 312 deletions
diff --git a/calendar/cal-util/timeutil.c b/calendar/cal-util/timeutil.c deleted file mode 100644 index 6bc893831d..0000000000 --- a/calendar/cal-util/timeutil.c +++ /dev/null @@ -1,312 +0,0 @@ -/* Miscellaneous time-related utilities - * - * Copyright (C) 1998 The Free Software Foundation - * - * Authors: Federico Mena <federico@nuclecu.unam.mx> - * Miguel de Icaza <miguel@nuclecu.unam.mx> - */ - -#include <libgnome/libgnome.h> -#include <string.h> -#include "timeutil.h" - - - -void -print_time_t (time_t t) -{ - struct tm *tm = localtime (&t); - - printf ("%d/%02d/%02d %02d:%02d:%02d", - 1900 + tm->tm_year, tm->tm_mon+1, tm->tm_mday, - tm->tm_hour, tm->tm_min, tm->tm_sec); -} - -char * -isodate_from_time_t (time_t t) -{ - struct tm *tm; - static char isotime [40]; - - tm = localtime (&t); - strftime (isotime, sizeof (isotime)-1, "%Y%m%dT%H%M%S", tm); - return isotime; -} - -time_t -time_add_minutes (time_t time, int minutes) -{ - struct tm *tm = localtime (&time); - time_t new_time; - - tm->tm_min += minutes; - if ((new_time = mktime (tm)) == -1) { - g_message ("time_add_minutes(): mktime() could not handle " - "adding %d minutes with\n", minutes); - print_time_t (time); - printf ("\n"); - return time; - } - return new_time; -} - -/* Adds a day onto the time, using local time. - Note that if clocks go forward due to daylight savings time, there are - some non-existent local times, so the hour may be changed to make it a - valid time. This also means that it may not be wise to keep calling - time_add_day() to step through a certain period - if the hour gets changed - to make it valid time, any further calls to time_add_day() will also return - this hour, which may not be what you want. */ -time_t -time_add_day (time_t time, int days) -{ - struct tm *tm = localtime (&time); - time_t new_time; -#if 0 - int dst_flag = tm->tm_isdst; -#endif - - tm->tm_mday += days; - tm->tm_isdst = -1; - - if ((new_time = mktime (tm)) == -1) { - g_message ("time_add_day(): mktime() could not handling adding %d days with\n", - days); - print_time_t (time); - printf ("\n"); - return time; - } - -#if 0 - /* I don't know what this is for. See also time_day_begin() and - time_day_end(). - Damon. */ - if (dst_flag > tm->tm_isdst) { - tm->tm_hour++; - new_time += 3600; - } else if (dst_flag < tm->tm_isdst) { - tm->tm_hour--; - new_time -= 3600; - } -#endif - - return new_time; -} - -time_t -time_add_week (time_t time, int weeks) -{ - return time_add_day (time, weeks * 7); -} - -time_t -time_add_month (time_t time, int months) -{ - struct tm *tm = localtime (&time); - time_t new_time; - int mday; - - mday = tm->tm_mday; - - tm->tm_mon += months; - tm->tm_isdst = -1; - if ((new_time = mktime (tm)) == -1) { - g_message ("time_add_month(): mktime() could not handling adding %d months with\n", - months); - print_time_t (time); - printf ("\n"); - return time; - } - tm = localtime (&new_time); - if (tm->tm_mday < mday) { - tm->tm_mon--; - tm->tm_mday = time_days_in_month (tm->tm_year+1900, tm->tm_mon); - return new_time = mktime (tm); - } - else - return new_time; -} - -time_t -time_add_year (time_t time, int years) -{ - struct tm *tm = localtime (&time); - time_t new_time; - - tm->tm_year += years; - if ((new_time = mktime (tm)) == -1) { - g_message ("time_add_year(): mktime() could not handling adding %d years with\n", - years); - print_time_t (time); - printf ("\n"); - return time; - } - return new_time; -} - -/* Number of days in a month, for normal and leap years */ -static const int days_in_month[2][12] = { - { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, - { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } -}; - -/* Returns whether the specified year is a leap year */ -static int -is_leap_year (int year) -{ - if (year <= 1752) - return !(year % 4); - else - return (!(year % 4) && (year % 100)) || !(year % 400); -} - -int -time_days_in_month (int year, int month) -{ - g_return_val_if_fail (year >= 1900, 0); - g_return_val_if_fail ((month >= 0) && (month < 12), 0); - - return days_in_month [is_leap_year (year)][month]; -} - -time_t -time_from_day (int year, int month, int day) -{ - struct tm tm; - - memset (&tm, 0, sizeof (tm)); - tm.tm_year = year - 1900; - tm.tm_mon = month; - tm.tm_mday = day; - tm.tm_isdst = -1; - - return mktime (&tm); -} - -time_t -time_year_begin (time_t t) -{ - struct tm tm; - - tm = *localtime (&t); - tm.tm_hour = 0; - tm.tm_min = 0; - tm.tm_sec = 0; - tm.tm_mon = 0; - tm.tm_mday = 1; - tm.tm_isdst = -1; - - return mktime (&tm); -} - -time_t -time_year_end (time_t t) -{ - struct tm tm; - - tm = *localtime (&t); - tm.tm_hour = 0; - tm.tm_min = 0; - tm.tm_sec = 0; - tm.tm_mon = 0; - tm.tm_mday = 1; - tm.tm_year++; - tm.tm_isdst = -1; - - return mktime (&tm); -} - -time_t -time_month_begin (time_t t) -{ - struct tm tm; - - tm = *localtime (&t); - tm.tm_hour = 0; - tm.tm_min = 0; - tm.tm_sec = 0; - tm.tm_mday = 1; - tm.tm_isdst = -1; - - return mktime (&tm); -} - -time_t -time_month_end (time_t t) -{ - struct tm tm; - - tm = *localtime (&t); - tm.tm_hour = 0; - tm.tm_min = 0; - tm.tm_sec = 0; - tm.tm_mday = 1; - tm.tm_mon++; - tm.tm_isdst = -1; - - return mktime (&tm); -} - -time_t -time_week_begin (time_t t) -{ - struct tm tm; - - /* FIXME: make it take week_starts_on_monday into account */ - - tm = *localtime (&t); - tm.tm_hour = 0; - tm.tm_min = 0; - tm.tm_sec = 0; - tm.tm_mday -= tm.tm_wday; - tm.tm_isdst = -1; - - return mktime (&tm); -} - -time_t -time_week_end (time_t t) -{ - struct tm tm; - - /* FIXME: make it take week_starts_on_monday into account */ - - tm = *localtime (&t); - tm.tm_hour = 0; - tm.tm_min = 0; - tm.tm_sec = 0; - tm.tm_mday += 7 - tm.tm_wday; - tm.tm_isdst = -1; - - return mktime (&tm); -} - -/* Returns the start of the day, according to the local time. */ -time_t -time_day_begin (time_t t) -{ - struct tm tm; - - tm = *localtime (&t); - tm.tm_hour = 0; - tm.tm_min = 0; - tm.tm_sec = 0; - tm.tm_isdst = -1; - - return mktime (&tm); -} - -/* Returns the end of the day, according to the local time. */ -time_t -time_day_end (time_t t) -{ - struct tm tm; - - tm = *localtime (&t); - tm.tm_mday++; - tm.tm_hour = 0; - tm.tm_min = 0; - tm.tm_sec = 0; - tm.tm_isdst = -1; - - return mktime (&tm); -} |