Hi All, According to the tar ball tzdata2008c.tar.gz following results are coming: ftp://elsie.nci.nih.gov/pub/tzdata2008c.tar.gz Asia/Karachi Sat May 31 18:59:59 2008 UTC = Sat May 31 23:59:59 2008 PKT isdst=0 Asia/Karachi Sat May 31 19:00:00 2008 UTC = Sun Jun 1 01:00:00 2008 PKST isdst=1 Asia/Karachi Sun Aug 31 17:59:59 2008 UTC = Sun Aug 31 23:59:59 2008 PKST isdst=1 Asia/Karachi Sun Aug 31 18:00:00 2008 UTC = Sun Aug 31 23:00:00 2008 PKT isdst=0 But, accordin to the Pakistan requirement this is the requirement: Reference:http://www.timeanddate.com/worldclock/clockchange.html?n=106 Sunday, June 1, 2008 at 12:00:59 AM No +5 hours PKT Sunday, June 1, 2008 at 1:01:00 AM 1 hour +6 hours PKST Sunday, August 31, 2008 at 12:00:59 AM 1 hour +6 hours PKST Saturday, August 30, 2008 at 11:01:00 PM No +5 hours PKT can you please comment on the above difference. Thanks and Regards Ariz