Hi - Because of how Internet Explorer reports javascript dates back to Seaside (as detected by Brian Murphy-Dye when using the FullCalendar jQuery plugin) I added the ability to determine the timezone based on the abbreviation IE reports. I used the list here: https://en.wikipedia.org/wiki/Time_zone_abbreviations to create an expanded version of TimeZone class>>#timeZones which encompasses those shown in the list on wikipedia. And added some convenience methods. Its not as useful or sophisticated as David Lewis's TimeZone database or Chronos, but its more than what's in the image now. If someone wants it I can make an issue and package my changes up for review. Right now I'm just including them as extensions to the JQWidgetBox-JQFullCalendar-Core package. Thanks for whatever guidance you care to provide. Paul DeBruicker