I’m having an issue with a site where entry times are being modified by EE when submitting.
Example:
I create an entry and set the Entry Date to 2011-06-03 08:00 AM. After submitting, I edit this entry and it shows the Entry Date as 2011-06-03 09:00 AM. One hour later.
Worthy of note:
Site localization and my member account are both… Server Time Zone = UTC -5 EST | Daylight Saving Time = No
Using latest 2.1.3, Build: 20101220
I had a similar issue several months ago, but resolved by changing up the DST.
EDIT: Seems this is an all too common issue. Hacking the core fixes the issue. See this tidbit in a bug report for the solution: https://support.ellislab.com/bugs/detail/15202/#10499