Rafael Sisto created LANG-850:
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Summary: DateUtils.truncatedCompareTo not working properly with
DST timezones
Key: LANG-850
URL: https://issues.apache.org/jira/browse/LANG-850
Project: Commons Lang
Issue Type: Bug
Components: lang.time.*
Affects Versions: 3.1
Environment: java version "1.6.0_32"
Windows 7
Timezone: America/Montevideo
Reporter: Rafael Sisto
Priority: Minor
The method truncatedCompareTo doesn't work properly when comparing 2 calendars
in a different timezone (when one of them is "America/Montevideo", the same as
the machine running the test).
Here is the sample code to reproduce.
The Timezone of the computer has to be set to UTC-3 Montevideo, with DST.
{quote}
GregorianCalendar c1 = new GregorianCalendar(2012,10,6);
System.out.println("The time: " + c1.getTime());
c1.setTimeZone(TimeZone.getTimeZone("America/Montevideo"));
Calendar truncate1 = DateUtils.truncate(c1, Calendar.MONTH);
System.out.println("America/Montevideo then truncated: " + truncate1.getTime());
GregorianCalendar c2 = new GregorianCalendar(2012,10,6);
c2.setTimeZone(TimeZone.getTimeZone("GMT"));
Calendar truncate2 = DateUtils.truncate(c2, Calendar.MONTH);
System.out.println("GMT then truncated: " + truncate2.getTime());
System.out.println("Truncated compare: " + DateUtils.truncatedCompareTo(c1, c2,
Calendar.MONTH));
{quote}
The output:
{quote}
The time: Tue Nov 06 00:00:00 UYST 2012
America/Montevideo then truncated: Thu Nov 01 00:00:00 UYST 2012
GMT then truncated: Wed Oct 31 22:00:00 UYST 2012
Truncated compare: 1
{quote}
A suggestion is to change the TimeZone of both calendars before truncating. For
example, setting both to TimeZone.getDefault().
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