Affects Version/s: 0.8.0
Fix Version/s: None
(Apologies if this is the wrong place to file Piggybank bugs)
and other http://svn.apache.org/viewvc/pig/trunk/contrib/piggybank/java/src/main/java/org/apache/pig/piggybank/evaluation/datetime/truncate/ classes that copy-paste the same code.
These classes parse dates like so:
DateTime dt = new DateTime((String)input.get(0).toString());
This has two problems:
(1) It messes up JVM static state by changing the DateTimeZone default time zone.
(2) It ignore timezone information in the input string, so times like "2009-12-09T23:59:59-0800" get truncated to "2009-12-10T00:00:00Z", which is the wrong day of year.
Instead, they should use something like this, which respects the input timezone and does not modify any global state:
DateTime dt ISODateTimeFormat.dateTime().withOffsetParsed().parseDateTime(isoDateString);
I have not provided a patch, because I'm not really set up to hack on Piggybank locally.
As a workaround, I am copy-pasting the classes into my own packages, and making the desired change.