When I use round or dateToString Function on DateTools class it is giving me wierd dates. If my date is for example 2008-15-10 11:22 and I try to round it to the DAY it is returning 20081510 but if only the hour is past 20:00 it increments the day for some reason. IE: 2008-15-10 21:22 would give me 20081511. Is this a bug or I am doing sthing wrong?

Hi,
did you check the timezone being used by the server where this is run?
The "2008-15-10 11:22" is not the internal representation but some form of visualization relative to the locale where the conversion is run (maybe your client? or a clever webapp localizing the time for you?), so it's possible that for the server an hour representing something >20h is really "tomorrow" from his point of view.

I run it on JBoss and user.timezone = America/New_York so it is correct, the date is timestamp from mysql which I think uses my system timezone: GMT-5 eastern time. I still don't know where that time shift could happen?

Hi,
as stated on the reference documentation in paragraph 4.2.1. Built-in bridges, all Dates are converted and indexed using GMT timezone.
This is strongly recommended for all servers, it really simplifies a lot of Date-math operations; you should covert to a different timezone on the presentation layer only.

BTW I might be wrong, but I think that GMT-5 is not the same as America/New_York, at least not at all moments of the year, as each state applies daylight shifts/legal hours at dates they decide themselves; another good reason to avoid using localized times on the server side.