Time zone rules change

Robert Elz kre at munnari.OZ.AU
Thu Sep 14 11:17:19 UTC 2006


    Date:        Wed, 13 Sep 2006 23:27:58 +0200
    From:        Oscar van Vlijmen <ovv at hetnet.nl>
    Message-ID:  <C12E447E.7EA3%ovv at hetnet.nl>

  | The first couple of theoretical Ramadans (day 1 of month 9 in the Islamic
  | calendar) start at:
  | 
  | Islamic year - Gregorian date (year, month, day)
  | 1427 - 2006,9,24
  | 1428 - 2007,9,13
  | 1429 - 2008,9,2
  | 1430 - 2009,8,22
  | 1431 - 2010,8,11
  | 1432 - 2011,8,1
  | 1433 - 2012,7,20
  | 1434 - 2013,7,9
  | 1435 - 2014,6,29
  | 1436 - 2015,6,18
  | 1437 - 2016,6,7
  | 1438 - 2017,5,27
  | 1439 - 2018,5,16
  | 1440 - 2019,5,6
  | 1441 - 2020,4,24

If these are correct (and a difference of a day or two can't matter)
then it is pretty clear that the "eve of Ramadan" rule for ending
summer time won't last past the next few years, 2011 at the latest
I'd guess, but perhaps more likely just this year and the next couple,
as by 2009 the entire month of Ramadan would fall before the last Thurs
of September, so switching back to that rule might be logical again
(with the next disruption not until 2020 when the start of simmer time
will fall into Ramadan).

It might be worth assuming that this year and next will both be affected
(for now) and setting approximate dates in the next rev of the zone file.

kre



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