Hello JodaTime Users,
I just noticed a strange behavior of JodaTime and was wondering if this
is a bug in the library. I've tested with jodatime 1.3 and 1.1 on JDK
1.5.03 on Windows (same problem on Solaris though) and my local timezone
is EST. I understand that in the US the daylight time rules change as
of 2007 when daylight time begins on March 11th and ends on November
4th.
I am basically parsing a string with only a date element and noticed
while running with jodatime 1.3 the time zone information is off and it
is still EDT (-04:00) instead of EST (-05:00). When running with
jodatime 1.1 everything is fine. Does this perhaps have anything to do
with the time zone updates regarding the US daylight savings time rules
changes that went into jodatime > 1.1 ?
Below is some code and outputs using the different libraries:
public void testJodaDateParsing() throws Exception {
DateTimeFormatter JODA_JDK_LIKE_FORMATTER =
DateTimeFormat.forPattern("EE MMM d HH:mm:ss zz yyyy");
DateTimeFormatter JODA_DATE_FORMATTER =
DateTimeFormat.forPattern("M/d/yyyy");
SimpleDateFormat JDK_DATE_FORMATTER = new
SimpleDateFormat("M/d/yyyy");
String dateStr = "3/20/2011";
Date jdkDate = JDK_DATE_FORMATTER.parse(dateStr);
DateTime jodaDate = JODA_DATE_FORMATTER.parseDateTime(dateStr);
System.out.println("Millis jodaDate: " + jodaDate.getMillis() +
"\t : " + JODA_JDK_LIKE_FORMATTER.print(jodaDate));
System.out.println("Millis jdkDate : " + jdkDate.getTime() +
"\t : " + jdkDate);
System.out.println("JODA_DATE_FORMATTER.getZone(): " +
JODA_DATE_FORMATTER.getZone());
System.out.println("DateTimeZone.getDefault() : " +
DateTimeZone.getDefault());
System.out.println("TimeZone.getDefault() : " +
TimeZone.getDefault());
} //END: testJodaDateParsing()
For jodatime 1.3:
------------------------------------------------------------------------
-----------------
Millis jodaDate: 1300593600000 : Sun Mar 20 00:00:00 EDT 2011
Millis jdkDate : 1300597200000 : Sun Mar 20 00:00:00 EST 2011
JODA_DATE_FORMATTER.getZone(): null
DateTimeZone.getDefault() : America/New_York
TimeZone.getDefault() :
sun.util.calendar.ZoneInfo[id="America/New_York",offset=-18000000,dstSav
ings=3600000,useDaylight=true,transitions=235,lastRule=java.util.SimpleT
imeZone[id=America/New_York,offset=-18000000,dstSavings=3600000,useDayli
ght=true,startYear=0,startMode=3,startMonth=3,startDay=1,startDayOfWeek=
1,startTime=7200000,startTimeMode=0,endMode=2,endMonth=9,endDay=-1,endDa
yOfWeek=1,endTime=7200000,endTimeMode=0]]
------------------------------------------------------------------------
-----------------
For jodatime 1.1:
------------------------------------------------------------------------
-----------------
Millis jodaDate: 1300597200000 : Sun Mar 20 00:00:00 EST 2011
Millis jdkDate : 1300597200000 : Sun Mar 20 00:00:00 EST 2011
JODA_DATE_FORMATTER.getZone(): null
DateTimeZone.getDefault() : America/New_York
TimeZone.getDefault() :
sun.util.calendar.ZoneInfo[id="America/New_York",offset=-18000000,dstSav
ings=3600000,useDaylight=true,transitions=235,lastRule=java.util.SimpleT
imeZone[id=America/New_York,offset=-18000000,dstSavings=3600000,useDayli
ght=true,startYear=0,startMode=3,startMonth=3,startDay=1,startDayOfWeek=
1,startTime=7200000,startTimeMode=0,endMode=2,endMonth=9,endDay=-1,endDa
yOfWeek=1,endTime=7200000,endTimeMode=0]]
------------------------------------------------------------------------
-----------------
Regards,
Sebastian
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