From 469815129bd1ce53dc332d2c75142292e0604ef3 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn-Egil=20Dahlberg?= Date: Tue, 6 Dec 2011 01:33:46 +0100 Subject: Add utc <-> seconds conversions bifs --- erts/emulator/beam/erl_time_sup.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'erts/emulator/beam/erl_time_sup.c') diff --git a/erts/emulator/beam/erl_time_sup.c b/erts/emulator/beam/erl_time_sup.c index 695d08ae2d..00a4906caa 100644 --- a/erts/emulator/beam/erl_time_sup.c +++ b/erts/emulator/beam/erl_time_sup.c @@ -648,7 +648,36 @@ static time_t gregday(Sint year, Sint month, Sint day) return ndays - 135140; /* 135140 = Jan 1, 1970 */ } +#define SECONDS_PER_MINUTE (60) +#define SECONDS_PER_HOUR (60 * SECONDS_PER_MINUTE) +#define SECONDS_PER_DAY (24 * SECONDS_PER_HOUR) +#define SECONDS_PER_YEAR (86400) + + +int univ_to_seconds(Sint year, Sint month, Sint day, Sint hour, Sint minute, Sint second, Sint64 *time) { + Sint days; + + if (!(IN_RANGE(1600, year, INT_MAX - 1) && + IN_RANGE(1, month, 12) && + IN_RANGE(1, day, (mdays[month] + + (month == 2 + && (year % 4 == 0) + && (year % 100 != 0 || year % 400 == 0)))) && + IN_RANGE(0, hour, 23) && + IN_RANGE(0, minute, 59) && + IN_RANGE(0, second, 59))) { + return 0; + } + + days = gregday(year, month, day); + *time = SECONDS_PER_DAY; + *time *= days; /* don't try overflow it, it hurts */ + *time += SECONDS_PER_HOUR * hour; + *time += SECONDS_PER_MINUTE * minute; + *time += second; + return 1; +} int local_to_univ(Sint *year, Sint *month, Sint *day, -- cgit v1.2.3