Hi, I am wondering if Olsen database supports the above with the following specifics: If it does, please let me know which zone I should use. Note that in Microsoft XP and Windows 7, it contains a Mid-Atlantic time zone which observes DST. Thanks *Isaac # Atlantic Ocean or Mid Atlantic rules # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule MidAT 1980 max - Mar lastSun 2:00 1:00 - Rule MidAT 1980 max - Sep lastSun 2:00 0 - # Atlantic Ocean or Mid Atlantic # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Atlantic/Atlantic_Ocean -2:26:08 - LMT 1890 # -2:00 - GST 1980 # South Georgia Time -2:00 MidAT GST