Winter	Summer	Civilian Time
-5	-4	EDT - Eastern Daylight
-4	-3	ADT - Atlantic Daylight
0	+1	BST - British Summer Time
-6	-5	CDT - Central Daylight
-7	-6	MDT - Mountain Daylight
-8	-7	PDT - Pacific Daylight
-9	-8	YDT - Yukon Daylight
-10	-9	HDT - Hawaii Daylight
+1	+2	CET - Central European Time

This table uses +/- references to Greenwich Main Time (GMT).

How to use this table:

The formula to use is as follows (meeting time - (your timezone value - meeting timezone value) = local meeting time).

For example, say that we have a guild meeting at 14:00 EDT in the summer and that you are in Alaska then your timezone is HDT.
The guild meeting will then take place at the (meeting time - (HDT - EDT) = local meeting time).
Using the formula the result would be 14 - (-9 - -4) = 9:00 AM.

Or simply use the calculator over here. :o)