Hi, I have written a Firefox add-on which uses a timezone data file which I generate from the tz data files. It is called Simple Timer + Clocks, and the homepage is http://simpletimerclocks.mozdev.org/ It has various functions including: # display your local clock # track the local time in locations around the world # receive notifications at specific times of the day (using your local time, or local time in other timezones) # receive notifications on specific dates (ie. calendar function) # count up from zero # count down from any time (less than 24 hours). You can set as many timers as you want # event logging for completed count ups, count downs, notifications and calendar events It existed for a while on mozdev.org, just recently I made it available for download through AMO. Regards, George Bradt