diff options
Diffstat (limited to 'calendar/cal-util/timeutil.c')
| -rw-r--r-- | calendar/cal-util/timeutil.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/calendar/cal-util/timeutil.c b/calendar/cal-util/timeutil.c index 7ddc0e04d4..2f9156a6f5 100644 --- a/calendar/cal-util/timeutil.c +++ b/calendar/cal-util/timeutil.c @@ -116,12 +116,21 @@ time_add_minutes (time_t time, int minutes) 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; @@ -131,6 +140,9 @@ time_add_day (time_t time, int days) 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; @@ -138,6 +150,7 @@ time_add_day (time_t time, int days) tm->tm_hour--; new_time -= 3600; } +#endif return new_time; } @@ -336,9 +349,26 @@ time_week_end (time_t t) return mktime (&tm); } +/* Returns the start of the day, according to the local time. */ time_t time_day_begin (time_t t) { +#if 1 + 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); + +#else + /* This is the original code which sometimes produces a time of 1:00. + I don't understand why it looked at the tm_isdst flags at all. + - Damon. */ + struct tm tm; time_t temp = t - 43200; int dstflag, dstflag2; @@ -363,11 +393,29 @@ time_day_begin (time_t t) } return temp; +#endif } +/* Returns the end of the day, according to the local time. */ time_t time_day_end (time_t t) { +#if 1 + 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); + +#else + /* This is the original code which has more problems than + time_day_begin(). - Damon. */ + struct tm tm; time_t temp; int dstflag, dstflag2; @@ -394,6 +442,7 @@ time_day_end (time_t t) if(dstflag > dstflag2) { } return temp; +#endif } static char * |