I'm forwarding this message from Joseph Thurakal, who is not on the time zone mailing list. Those of you who are on the time zone mailing list: please direct replies appropriately. JT: the idea if you're writing a C language program is to set the time zone environment variable to the value associated with the US central time zone location of interest, fill in a "struct tm" with the values associated with the instant of interest, call "mktime" to find the "time_t" value associated with the filled-in structure, then re-set the time zone enviroment variable to the appropriate "another time zone" value and feed mktime's returned time_t value to "localtime." --ado ________________________________ From: Joseph Thurakal [mailto:josephthurakal@gmail.com] Sent: Friday, October 27, 2006 7:55 AM To: tz@lecserver.nci.nih.gov Subject: tz database help Hi, My name is Joseph Thurakal and I am new to tz database. I am trying to figure out how to convert historic US central time zone times into another time zone, and I can't figure this out from the readme files. Could you outline how to do this or point me to a good source? Thanks for your help. Joe