On Mon, Nov 8, 2010 at 1:38 PM, Paul Gilmartin <[email protected]> wrote: <deleted> > And the concept of exactly two time zones, "GMT" and "LOCAL" is > parochial. There are 24 zones (actually far more), and a proper > conversion function has two arguments: > > localtime( UTC, zone ) > > ... dealing with the need to operate various LPARs with > different local time zones but the same STP. In fact, it > even allows z/OS processes within the same LPAR to operate > with different time zones as easily as: <deleted>
http://www.worldtimezone.com/ Beyond the 26 hourly time zone from +14 Tarawa, Kiribati to -11 Midway Island, Hawaii there are several time zones with 30 minute offsets and a few with 15 minute offsets. Within a time zone you can have a Northern Hemisphere Summer DST and a Southern Hemishere Sumer DST, and different countries having different changeover dates. Australia even lets the individual states change their offset and change dates with just a few weeks notice, not like the 18 months notice the U.S. gave for the 2007 change. Australia even did a special Sydney Olympics 2000 changeover date. What I would like to see, but I doubt it would ever be implemented, would be like the Leap Second rule. If you need to drop a second, you skip the last second of June 30 or December 31. If you need to add a second, you have another second at the end of June 30 or December 31, enumberated as 23:59:60. For falling back, instead of repeating the hour from 01:00 to 02:00, extend the 1 oclock and 2 oclock hour from 60 minutes to 90 minutes. 0000-0059, 0100-0189, 0200-0289, 0300-0359. On an manually set clock change during the time change, you let the clock run to 30 minutes past the hour during minutes 60-89, set it back 30 minutes, let it run for 90 minutes for the 00-89 minutes, and set the clock back another 30 minutes. -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
