Since r18.5, the internal date-time stamp in log records has been stored as UTC and not local time as was the case previously.
There is no currently documented way to programmatically convert such timestamps to a local time.
IDMSIN01 can be used to so this with request code 5 and format code 7.
See Knowledge Document TEC1610613 for more information on how to do this (including sample code).
http://www.ca.com/us/support/ca-support-online/product-content/knowledgebase-articles/tec1610613.aspx