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Java Forum / General / October 2007Riyadh Timezone
Java TimeZone classes say: Offset DST 3.117777777777778 3.117777777777778 Asia/Riyadh87 GMT+03:07 3.117777777777778 3.117777777777778 Asia/Riyadh88 GMT+03:07 3.117777777777778 3.117777777777778 Asia/Riyadh89 GMT+03:07 3.117777777777778 3.117777777777778 Mideast/Riyadh87 GMT+03:07 3.117777777777778 3.117777777777778 Mideast/Riyadh88 GMT+03:07 3.117777777777778 3.117777777777778 Mideast/Riyadh89 GMT+03:07 In other words 3 hours and 7 minutes, most peculiar. What is even more peculiar is every website I checked on the web says the offset is a simple three hours. What gives? Where did those 7 minutes come from? I speculate it is used at Mecca to arrange for true solar time.  SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com On Thu, 11 Oct 2007 03:39:38 GMT, Roedy Green <see_website@mindprod.com.invalid> wrote, quoted or indirectly quoted someone who said : >In other words 3 hours and 7 minutes, most peculiar. What is even >more peculiar is every website I checked on the web says the offset is >a simple three hours. What gives? Where did those 7 minutes come >from? there is also an entry for a plain 3.0 hours. 3.0 3.0 Asia/Riyadh Arabia Standard Time SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com On Thu, 11 Oct 2007 03:39:38 GMT, Roedy Green <see_website@mindprod.com.invalid> wrote, quoted or indirectly quoted someone who said : >Java TimeZone classes say: > [quoted text clipped - 18 lines] > >I speculate it is used at Mecca to arrange for true solar time. this is my best guess as to what is going on: Use Asia/Riyadh for Arabia Standard Time. Asia/Riyadh87, Asia/Riyadh88 and Asia/Riyadh89 are 3 hours and 7 minutes east of UTC so presumably that Muslims could use natural sun time at Mecca in 1987 through 1989. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com > Java TimeZone classes say: > [quoted text clipped - 18 lines] > > I speculate it is used at Mecca to arrange for true solar time. AFAIK Saudia Arabia used apparent solar time from 1987 to 1989. /gordon -- On Oct 11, 5:39 am, Roedy Green <see_webs...@mindprod.com.invalid> wrote: > Java TimeZone classes say: > [quoted text clipped - 16 lines] > a simple three hours. What gives? Where did those 7 minutes come > from? The above offset is wrong and right. First it should be 3:07:04 (four seconds more than you have). Second, these 3:07:04 are kind of an average. Each individual day in the year is slightly shifted, so that sunset happens at 00:00 local time. And sunset is the begin of the Islamic day. They moved what Christians would call midnight to the sunset, including per-day corrections to make it fit - for that particular location. At least almost. Third, in parallel to these three years Riyhad is just using an offset of 3:00 since 1950 for its normal timezone. Until 1950 it was 3:06:52. [All offset data courtesy of the National Institute of Health "Olson" database - from which also Sun took the timezone data for Java. Just that Sun decided to use an own binary encoding instead of using the standard one.] In comp.lang.java.programmer message <1192123676.198138.207720@g4g2000hs f.googlegroups.com>, Thu, 11 Oct 2007 17:27:56, Hunter Gratzner <a24900@googlemail.com> posted: >Third, in parallel to these three years Riyhad is just using an offset >of 3:00 since 1950 for its normal timezone. Until 1950 it was 3:06:52. Is it known whether anywhere in the world still ever uses, for its civil time, an offset from GMT/UTC which is not a multiple of fifteen minutes? Is it known whether there is more than one location which routinely changes its clocks between winter and summer by an amount other than one hour? In each case, can it be confirmed by means independent of the traditional databases? Signature(c) John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v6.05 IE 6. Web <URL:http://www.merlyn.demon.co.uk/> - w. FAQish topics, links, acronyms PAS EXE etc : <URL:http://www.merlyn.demon.co.uk/programs/> - see 00index.htm Dates - miscdate.htm moredate.htm js-dates.htm pas-time.htm critdate.htm etc. > Is it known whether anywhere in the world still ever uses, for its > civil time, an offset from GMT/UTC which is not a multiple of > fifteen minutes? AFAIK, all are multiples of 30 minutes except Nepal (UTC+5:45) and Chatham Islands (NZ) (UTC+12:45). The latter is odd in that it's an offset greater than 12 hours from UTC (and +13:45 in the summer). > Is it known whether there is more than one location which routinely > changes its clocks between winter and summer by an amount other than > one hour? Lord Howe Island (Aus) changes from UTC+10:30 to UTC+11 in the summer. I have a vague recollection of someplace that observes 2H DST, but can't think of one off hand. /gordon -- On Fri, 12 Oct 2007 14:44:14 +0100, Dr J R Stockton <jrs@merlyn.demon.co.uk> wrote, quoted or indirectly quoted someone who said : > (c) John Stockton, Surrey, UK. I would like to publicly thank Dr. Stockton. It has taken me several days to incorporate all the corrections and improvements to the Java glossary he found on time and calendars. I hope you will find the new versions have more precise language. in particular see: http://mindprod.com/jgloss/calendar.html http://mindprod.com/jgloss/utc.html http://mindprod.com/jgloss/gmt.html http://mindprod.com/jgloss/leapyear.html http://mindprod.com/jgloss/leapsecond.html http://mindprod.com/jgloss/time.html http://mindprod.com/jgloss/gregoriancalendar.html http://mindprod.com/jgloss/timezone.html http://mindprod.com/jgloss/summertime.html http://mindprod.com/jgloss/missingdays.html http://mindprod.com/applet/holidays.html SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com > Is it known whether anywhere in the world still ever uses, for its civil > time, an offset from GMT/UTC which is not a multiple of fifteen minutes? I would search "the traditional database" for potential candidates. > Is it known whether there is more than one location which routinely > changes its clocks between winter and summer by an amount other than one > hour? Again I would search "the traditional database" for potential candidates. > In each case, can it be confirmed by means independent of the > traditional databases? You didn't say "easily confirmed", so I'd say you can. Once you have potential candidates, contact the embassy of that country, their local science academy, their astronomy academy, the leading university, or whatever you can come up with. Try to find out who has the power to make the time decision for that region. Locate a copy of the decision, law, etc. Get it translated into your language. And you have your confirmation. Further, "the traditional database" often lists the source of their information. You could try to obtain that source to verify that it states what is claimed it states. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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