![]() I bring this up, because if someone working in California needs an item from someone in New York both sides must agree on how to handle the time-zone differences. Note that this creates a cascading effect, i.e, people in New York go to work 3 hours earlier than people in California, and therefore go home 3 hours earlier. In America as a whole, most people start their work day at 8AM local time, meaning he would have been at work 2 hours. Calculations to the west require that you subtract to a maximum of 12.Calculations to the east require that you add to a maximum of 12.The hard part in determining the time is this: Is the time zone that you're calculating determined to be East or West of the UTC/GMT line? You are correct in your calculation that you can subtract 8, which will give you the time in PDT (Pacific Daylight Time). 9:00 pm 21:00 PST (Pacific Standard Time) (Portland, OR, USA). Portland to CST call time Best time for a conference call or a meeting is between 8am-4pm in Portland which corresponds to 10am-6pm in CST. In order to calculate local time, each timezone in the world has an OFFSET VALUE, as you have correctly deduced: PST (Pacific Standard Time) is 2 hours behind Central Standard Time 9:00 pm 21:00 in Portland, OR, USA is 11:00 pm 23:00 in CST. UTC stands for Coordinated Universal Time, also known as the Universal Time Code, and is abbreviated in settings files as Unless specified by the server's customer facing documentation, all timezone info is stored as UTC. UTC is 8 hours ahead of Portland, and has the same time as Greenwich Mean Time. New editions of the database and code are published as changes warrant, usually several times per year.Īll linux based servers use the zoneinfo database to coordinate time across the Internet as a whole. The database, as well as some reference source code, is in the public domain. It also includes transitions such as daylight saving time, and also records leap seconds. The database attempts to record historical time zones and all civil changes since 1970, the Unix time epoch. Its uniform naming convention for time zones, such as America/New_York and Europe/Paris, was designed by Paul Eggert. Paul Eggert is currently its editor and maintainer. It is sometimes called the Olson database, referring to the founding contributor, Arthur David Olson. The tz database, also called tzdata, the zoneinfo database or IANA (Internet Assigned Numbers Authority) time zone database, is a collaborative compilation of information about the world's time zones, primarily intended for use with computer programs and operating systems. Can you calculate my offset and give me the proper zoneinfo entry? I'll give the answers below, but first, quoting Wikipedia:
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