[Zope] Dates off by one day

Recently moved to a new server farm and am having a problem with dates from MySQL that are rendered using strftime. The date in MySQL is correct (e.g. 2005-01-22) but if the date is rendered with strftime the date displayed is one day earlier (e.g., 2005-01-21). MySQL and Zope are on separate servers as they were before the switch to the new servers but this didn't happen in the old environment. Anyone have any thoughts on this? Thanks, Kevin