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-rw-r--r--erts/emulator/test/time_SUITE.erl22
1 files changed, 17 insertions, 5 deletions
diff --git a/erts/emulator/test/time_SUITE.erl b/erts/emulator/test/time_SUITE.erl
index 4d12e3449c..a0a8a9c42c 100644
--- a/erts/emulator/test/time_SUITE.erl
+++ b/erts/emulator/test/time_SUITE.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1997-2011. All Rights Reserved.
+%% Copyright Ericsson AB 1997-2013. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
@@ -241,14 +241,26 @@ compare(Utc0, Local) ->
%% Two linear times can be subtracted to give their difference
%% in seconds.
%%
-%% XXX Limitations: The length of months and leap years are not
-%% taken into account; thus a comparision of dates is only
-%% valid if they are in the SAME month.
+%% XXX Limitations: Simplified leap year calc will fail for 2100 :-)
linear_time({{Year, Mon, Day}, {Hour, Min, Sec}}) ->
- 86400*(366*Year + 31*(Mon-1) + (Day-1)) +
+ 86400*(year_to_days(Year) + month_to_days(Year,Mon) + (Day-1)) +
3600*Hour + 60*Min + Sec.
+year_to_days(Year) ->
+ Year * 365 + (Year-1) div 4.
+
+month_to_days(Year, Mon) ->
+ DoM = [31,days_in_february(Year),31,30,31,30,31,31,30,31,30,31],
+ {PastMonths,_} = lists:split(Mon-1, DoM),
+ lists:sum(PastMonths).
+
+days_in_february(Year) ->
+ case (Year rem 4) of
+ 0 -> 29;
+ _ -> 28
+ end.
+
%% This functions returns either the normal timezone or the
%% the DST timezone, depending on the given UTC time.
%%