mirror of
https://github.com/Mercury-Language/mercury.git
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91 lines
3.0 KiB
Mathematica
91 lines
3.0 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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%
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% In Melbourne, daylight savings
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% Starts: 2 am EST (Eastern Standard Time) on 26 October 2003
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% Ends: 2 am EST (Eastern Standard Time) on 28 March 2004
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% At start of daylight saving period, move clock forward one hour.
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% At end of daylight saving period, move clock back one hour.
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%
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:- module dst_test.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is det.
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:- implementation.
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:- import_module list.
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:- import_module maybe.
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:- import_module string.
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:- import_module time.
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main(!IO) :-
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difftest(!IO),
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local_vs_gm_test(!IO).
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:- pred difftest(io::di, io::uo) is det.
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difftest(!IO) :-
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% Sunday 2003-10-26 01:30:00
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mktime(tm(103, 9, 26, 1, 30, 0, 298, 0, yes(standard_time)),
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BeforeStart, !IO),
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% Sunday 2003-10-26 03:30:00
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mktime(tm(103, 9, 26, 3, 30, 0, 298, 0, yes(daylight_time)),
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AfterStart, !IO),
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% difference should be 1 hour
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( if difftime(AfterStart, BeforeStart) = 3600.0 then
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io.write_string("start DST succeeded\n", !IO)
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else
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io.write_string("start DST failed\n", !IO)
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),
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% Sunday 2004-03-28 02:30:00 (occurs twice)
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mktime(tm(104, 2, 28, 2, 30, 0, 87, 0, yes(daylight_time)),
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BeforeEnd, !IO),
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mktime(tm(104, 2, 28, 2, 30, 0, 87, 0, yes(standard_time)),
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AfterEnd, !IO),
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% difference should be 1 hour
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( if difftime(AfterEnd, BeforeEnd) = 3600.0 then
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io.write_string("end DST succeeded\n", !IO)
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else
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io.write_string("end DST failed\n", !IO)
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),
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io.nl(!IO).
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:- pred local_vs_gm_test(io::di, io::uo) is det.
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local_vs_gm_test(!IO) :-
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local_vs_gm(tm(103, 9, 26, 1, 59, 0, 298, 0, yes(standard_time)), !IO),
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local_vs_gm(tm(103, 9, 26, 3, 0, 0, 298, 0, yes(daylight_time)), !IO),
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local_vs_gm(tm(103, 9, 26, 3, 1, 0, 298, 0, yes(daylight_time)), !IO),
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io.nl(!IO),
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local_vs_gm(tm(104, 2, 28, 1, 59, 0, 87, 0, yes(daylight_time)), !IO),
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local_vs_gm(tm(104, 2, 28, 2, 0, 0, 87, 0, yes(daylight_time)), !IO),
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local_vs_gm(tm(104, 2, 28, 2, 1, 0, 87, 0, yes(daylight_time)), !IO),
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io.nl(!IO),
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local_vs_gm(tm(104, 2, 28, 2, 59, 0, 87, 0, yes(daylight_time)), !IO),
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local_vs_gm(tm(104, 2, 28, 2, 0, 0, 87, 0, yes(standard_time)), !IO),
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local_vs_gm(tm(104, 2, 28, 2, 1, 0, 87, 0, yes(standard_time)), !IO),
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io.nl(!IO),
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local_vs_gm(tm(104, 2, 28, 2, 59, 0, 87, 0, yes(standard_time)), !IO),
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local_vs_gm(tm(104, 2, 28, 3, 0, 0, 87, 0, yes(standard_time)), !IO),
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local_vs_gm(tm(104, 2, 28, 3, 1, 0, 87, 0, yes(standard_time)), !IO),
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io.nl(!IO).
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:- pred local_vs_gm(tm::in, io::di, io::uo) is det.
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local_vs_gm(TM, !IO) :-
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mktime(TM, Time, !IO),
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localtime(Time, LocalTM, !IO),
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LocalTimeStr = asctime(LocalTM),
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GmtTimeStr = asctime(gmtime(Time)),
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io.format("Local:\t%s", [s(LocalTimeStr)], !IO),
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io.format("GMT:\t%s", [s(GmtTimeStr)], !IO).
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