From 83515e39e7c321910082fa3ef8a06a659c51f70a Mon Sep 17 00:00:00 2001 From: Hans Bolinder Date: Thu, 22 Feb 2018 13:33:40 +0100 Subject: stdlib: Add system time functions to module calendar --- lib/stdlib/doc/src/calendar.xml | 18 +++++++++++++++++- lib/stdlib/src/calendar.erl | 23 +++++++++++++++++++++-- lib/stdlib/test/calendar_SUITE.erl | 24 +++++++++++++++++++++--- 3 files changed, 59 insertions(+), 6 deletions(-) (limited to 'lib/stdlib') diff --git a/lib/stdlib/doc/src/calendar.xml b/lib/stdlib/doc/src/calendar.xml index 65b3edcdf6..0c4a30ce16 100644 --- a/lib/stdlib/doc/src/calendar.xml +++ b/lib/stdlib/doc/src/calendar.xml @@ -4,7 +4,7 @@
- 19962016 + 19962018 Ericsson AB. All Rights Reserved. @@ -338,6 +338,22 @@ + + + Convert system time to local date and time. + +

Converts a specified system time into local date and time.

+ + + + + + Convert system time to universal date and time. + +

Converts a specified system time into universal date and time.

+ + + Compute the difference between two times (deprecated). 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. diff --git a/lib/stdlib/test/calendar_SUITE.erl b/lib/stdlib/test/calendar_SUITE.erl index 20053dfe54..52c3cc68eb 100644 --- a/lib/stdlib/test/calendar_SUITE.erl +++ b/lib/stdlib/test/calendar_SUITE.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 1997-2016. All Rights Reserved. +%% Copyright Ericsson AB 1997-2018. 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. @@ -30,7 +30,8 @@ leap_years/1, last_day_of_the_month/1, local_time_to_universal_time_dst/1, - iso_week_number/1]). + iso_week_number/1, + system_time/1]). -define(START_YEAR, 1947). -define(END_YEAR, 2012). @@ -40,7 +41,8 @@ suite() -> [{ct_hooks,[ts_install_cth]}]. all() -> [gregorian_days, gregorian_seconds, day_of_the_week, day_of_the_week_calibrate, leap_years, - last_day_of_the_month, local_time_to_universal_time_dst, iso_week_number]. + last_day_of_the_month, local_time_to_universal_time_dst, + iso_week_number, system_time]. groups() -> []. @@ -157,6 +159,22 @@ local_time_to_universal_time_dst_x(Config) when is_list(Config) -> iso_week_number(Config) when is_list(Config) -> check_iso_week_number(). +system_time(Config) when is_list(Config) -> + EpochDate = {{1970,1,1}, {0,0,0}}, + Epoch = calendar:datetime_to_gregorian_seconds(EpochDate), + Y0 = {{0,1,1},{0,0,0}}, + + EpochDate = calendar:system_time_to_universal_time(0, second), + 0 = calendar:datetime_to_gregorian_seconds(Y0), + Y0 = calendar:system_time_to_universal_time(-Epoch, second), + + T = erlang:system_time(second), + UDate = calendar:system_time_to_universal_time(T, second), + LDate = erlang:universaltime_to_localtime(UDate), + LDate = calendar:system_time_to_local_time(T, second), + + ok. + %% %% LOCAL FUNCTIONS %% -- cgit v1.2.3