diff options
Diffstat (limited to 'lib/stdlib/src/calendar.erl')
| -rw-r--r-- | lib/stdlib/src/calendar.erl | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/lib/stdlib/src/calendar.erl b/lib/stdlib/src/calendar.erl index 55a0cfc9a1..2e24e8c133 100644 --- a/lib/stdlib/src/calendar.erl +++ b/lib/stdlib/src/calendar.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 1996-2016. All Rights Reserved. +%% Copyright Ericsson AB 1996-2018. All Rights Reserved. %% %% Licensed under the Apache License, Version 2.0 (the "License"); %% you may not use this file except in compliance with the License. @@ -41,6 +41,8 @@ now_to_universal_time/1, seconds_to_daystime/1, seconds_to_time/1, + system_time_to_local_time/2, + system_time_to_universal_time/2, time_difference/2, time_to_seconds/1, universal_time/0, @@ -59,6 +61,7 @@ -define(DAYS_PER_100YEARS, 36524). -define(DAYS_PER_400YEARS, 146097). -define(DAYS_FROM_0_TO_1970, 719528). +-define(SECONDS_FROM_0_TO_1970, (?DAYS_FROM_0_TO_1970*?SECONDS_PER_DAY)). %%---------------------------------------------------------------------- %% Types @@ -309,7 +312,7 @@ local_time_to_universal_time_dst(DateTime) -> -spec now_to_datetime(Now) -> datetime1970() when Now :: erlang:timestamp(). now_to_datetime({MSec, Sec, _uSec}) -> - Sec0 = MSec*1000000 + Sec + ?DAYS_FROM_0_TO_1970*?SECONDS_PER_DAY, + Sec0 = MSec*1000000 + Sec + ?SECONDS_FROM_0_TO_1970, gregorian_seconds_to_datetime(Sec0). -spec now_to_universal_time(Now) -> datetime1970() when @@ -363,6 +366,22 @@ seconds_to_time(Secs) when Secs >= 0, Secs < ?SECONDS_PER_DAY -> Second = Secs1 rem ?SECONDS_PER_MINUTE, {Hour, Minute, Second}. +-spec system_time_to_local_time(Time, TimeUnit) -> datetime() when + Time :: integer(), + TimeUnit :: erlang:time_unit(). + +system_time_to_local_time(Time, TimeUnit) -> + UniversalDate = system_time_to_universal_time(Time, TimeUnit), + erlang:universaltime_to_localtime(UniversalDate). + +-spec system_time_to_universal_time(Time, TimeUnit) -> datetime() when + Time :: integer(), + TimeUnit :: erlang:time_unit(). + +system_time_to_universal_time(Time, TimeUnit) -> + Secs = erlang:convert_time_unit(Time, TimeUnit, second), + gregorian_seconds_to_datetime(Secs + ?SECONDS_FROM_0_TO_1970). + %% time_difference(T1, T2) = Tdiff %% %% Returns the difference between two {Date, Time} structures. |