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set of utility functions that wrap the calendar module and erlangs now() date() and time() functions
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| -module(date_util). | |
| -export([ | |
| epoch/0, epoch_hires/0, | |
| epoch_gregorian_seconds/0, epoch_to_gregorian_seconds/1, | |
| now_to_seconds/1, now_to_seconds_hires/1, | |
| now_to_gregorian_seconds/0, | |
| now_to_milliseconds/1, now_to_milliseconds_hires/1, | |
| gregorian_seconds_to_epoch/1, | |
| date_to_epoch/1, datetime_to_epoch/1, | |
| day_difference/2, | |
| is_older_by/3, is_sooner_by/3, | |
| is_time_older_than/2, is_time_sooner_than/2, | |
| add/2, subtract/2 | |
| ]). | |
| epoch() -> | |
| now_to_seconds(now()). | |
| epoch_hires() -> | |
| now_to_seconds_hires(now()). | |
| now_to_seconds({Mega, Sec, _}) -> | |
| (Mega * 1000000) + Sec. | |
| now_to_milliseconds({Mega, Sec, Micro}) -> | |
| now_to_seconds({Mega, Sec, Micro}) * 1000. | |
| now_to_seconds_hires({Mega, Sec, Micro}) -> | |
| now_to_seconds({Mega, Sec, Micro}) + (Micro / 1000000). | |
| now_to_milliseconds_hires({Mega, Sec, Micro}) -> | |
| now_to_seconds_hires({Mega, Sec, Micro}) * 1000. | |
| epoch_gregorian_seconds() -> | |
| calendar:datetime_to_gregorian_seconds({{1970,1,1}, {0,0,0}}). | |
| now_to_gregorian_seconds() -> | |
| epoch_to_gregorian_seconds(now()). | |
| epoch_to_gregorian_seconds({Mega, Sec, Micro}) -> | |
| epoch_to_gregorian_seconds(now_to_seconds({Mega, Sec, Micro})); | |
| epoch_to_gregorian_seconds(Now) -> | |
| EpochSecs = epoch_gregorian_seconds(), | |
| Now + EpochSecs. | |
| gregorian_seconds_to_epoch(Secs) -> | |
| EpochSecs = epoch_gregorian_seconds(), | |
| Secs - EpochSecs. | |
| date_to_epoch(Date) -> | |
| datetime_to_epoch({Date, {0,0,0} }). | |
| datetime_to_epoch({Date, Time}) -> | |
| gregorian_seconds_to_epoch( | |
| calendar:datetime_to_gregorian_seconds({Date, Time})). | |
| is_older_by(T1, T2, {days, N}) -> | |
| N1 = day_difference(T1, T2), | |
| case N1 of | |
| N2 when (-N < N2) -> | |
| true; | |
| _ -> | |
| false | |
| end. | |
| is_sooner_by(T1, T2, {days, N}) -> | |
| case day_difference(T1, T2) of | |
| N1 when N > N1 -> | |
| true; | |
| _ -> | |
| false | |
| end. | |
| is_time_older_than({Date, Time}, Mark) -> | |
| is_time_older_than(calendar:datetime_to_gregorian_seconds({Date, Time}), | |
| Mark); | |
| is_time_older_than(Time, {DateMark, TimeMark}) -> | |
| is_time_older_than(Time, | |
| calendar:datetime_to_gregorian_seconds({DateMark, | |
| TimeMark})); | |
| is_time_older_than(Time, Mark) when | |
| is_integer(Time), | |
| is_integer(Mark) -> | |
| Time < Mark. | |
| day_difference({D1, _}, D2) -> | |
| day_difference(D1, D2); | |
| day_difference(D1, {D2, _}) -> | |
| day_difference(D1, D2); | |
| day_difference(D1, D2) -> | |
| Days1 = calendar:date_to_gregorian_days(D1), | |
| Days2 = calendar:date_to_gregorian_days(D2), | |
| Days1 - Days2. | |
| is_time_sooner_than({Date, Time}, Mark) -> | |
| is_time_sooner_than(calendar:datetime_to_gregorian_seconds({Date, Time}), | |
| Mark); | |
| is_time_sooner_than(Time, {DateMark, TimeMark}) -> | |
| is_time_sooner_than(Time, | |
| calendar:datetime_to_gregorian_seconds({DateMark, | |
| TimeMark})); | |
| is_time_sooner_than(Time, Mark) when | |
| is_integer(Time), | |
| is_integer(Mark) -> | |
| Time > Mark. | |
| subtract(Date, {days, N}) -> | |
| New = calendar:date_to_gregorian_days(Date) - N, | |
| calendar:gregorian_days_to_date(New). | |
| add(Date, {days, N}) -> | |
| New = calendar:date_to_gregorian_days(Date) + N, | |
| calendar:gregorian_days_to_date(New). |
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