diff options
Diffstat (limited to 'src/libical/icaltime.c')
| -rw-r--r-- | src/libical/icaltime.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/src/libical/icaltime.c b/src/libical/icaltime.c index 223ebb0a..fe03aee5 100644 --- a/src/libical/icaltime.c +++ b/src/libical/icaltime.c @@ -111,6 +111,7 @@ static time_t icaltime_timegm(const struct tm *tm) static time_t make_time(struct tm *tm, int tzm) { time_t tim; + int febs; static int days[] = { -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 }; @@ -145,12 +146,17 @@ static time_t make_time(struct tm *tm, int tzm) tim = (time_t) ((tm->tm_year - 70) * 365 + ((tm->tm_year - 1) / 4) - 17); + /* adjust: no leap days every 100 years, except every 400 years. */ + + febs = (tm->tm_year - 100) - ((tm->tm_mon <= 1) ? 1 : 0); + tim -= febs / 100; + tim += febs / 400; + /* add number of days elapsed in the current year */ tim += days[tm->tm_mon]; - /* check and adjust for leap years (the leap year check only valid - during the 32-bit era */ + /* check and adjust for leap years */ if ((tm->tm_year & 3) == 0 && tm->tm_mon > 1) tim += 1; |