[tz] [PATCH] Estimate Morocco 2013-2038 transitions for Ramadan.

Erik Homoet ehomoet at quintessence.net
Thu Mar 7 10:51:22 UTC 2013


Hi Paul,

Thanks for the update. Does this also mean that there will an updated tzdata
file coming soon?

Best regards,
Erik


On 07/03/13 07:38, "Paul Eggert" <eggert at cs.ucla.edu> wrote:

> Here's a proposed patch to try to address the problem with Moroccan DST.
> I've pushed this to the unofficial github version of the tz database.
> ===
> * africa (Morocco): Use GNU Emacs 24.3 to estimate Ramadan-based
> DST transition dates for 2013-2038.  Heads-up by Erik Homoet in
> <http://mm.icann.org/pipermail/tz/2013-February/018680.html>.
> ---
>  africa | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 54 insertions(+), 1 deletion(-)
> 
> diff --git a/africa b/africa
> index f378cc4..5f4f8eb 100644
> --- a/africa
> +++ b/africa
> @@ -846,6 +846,41 @@ Zone Indian/Mayotte 3:00:56 - LMT 1911 Jul # Mamoutzou
>  # 3:00 am Friday, July 20, 2012 and will again be advanced by 60 minutes
>  # August 20, 2012 from 2:00 am.
>  
> +# From Paul Eggert (2013-03-06):
> +# Morocco's daylight-saving transitions due to Ramadan seem to be
> +# announced a bit in advance.  On 2012-07-11 the Moroccan government
> +# announced that year's Ramadan daylight-saving transitions would be
> +# 2012-07-20 and 2012-08-20; see
> +# <http://www.mmsp.gov.ma/fr/actualites.aspx?id=288>.
> +#
> +# To estimate what the Moroccan government will do in future years,
> +# transition dates for 2013 through 2021 were determined by running
> +# the following program under GNU Emacs 24.3:
> +#
> +# (let ((islamic-year 1434))
> +#   (while (< islamic-year 1444)
> +#     (let ((a
> +#      (calendar-gregorian-from-absolute
> +#       (calendar-islamic-to-absolute (list 9 1 islamic-year))))
> +#     (b
> +#      (calendar-gregorian-from-absolute
> +#       (calendar-islamic-to-absolute (list 10 1 islamic-year)))))
> +# (insert
> +#  (format
> +#   (concat "Rule\tMorocco\t%d\tonly\t-\t%s\t %2d\t 3:00\t0\t-\n"
> +#    "Rule\tMorocco\t%d\tonly\t-\t%s\t %2d\t 2:00\t1:00\tS\n")
> +#   (car (cdr (cdr a))) (calendar-month-name (car a) t) (car (cdr a))
> +#   (car (cdr (cdr b))) (calendar-month-name (car b) t) (car (cdr b)))))
> +#     (setq islamic-year (+ 1 islamic-year))))
> +#
> +# with the results hand-edited for 2020-2022, when the normal spring-forward
> +# date falls during the estimated Ramadan.
> +#
> +# From 2023 through 2038 Ramadan is not predicted to overlap with
> +# daylight saving time.  Starting in 2039 there will be overlap again,
> +# but 32-bit time_t values roll around in 2038 so for now do not worry
> +# about dates after 2038.
> +
>  # RULE NAME FROM TO TYPE IN ON AT SAVE LETTER/S
>  
>  Rule Morocco 1939 only - Sep 12  0:00 1:00 S
> @@ -871,10 +906,28 @@ Rule Morocco 2010 only - May  2  0:00 1:00 S
>  Rule Morocco 2010 only - Aug  8  0:00 0 -
>  Rule Morocco 2011 only - Apr  3  0:00 1:00 S
>  Rule Morocco 2011 only - Jul  31  0 0 -
> -Rule Morocco 2012 max - Apr  lastSun 2:00 1:00 S
> +Rule Morocco 2012 2019 - Apr  lastSun 2:00 1:00 S
>  Rule Morocco 2012 max - Sep  lastSun 3:00 0 -
>  Rule Morocco 2012 only - Jul  20  3:00 0 -
>  Rule Morocco 2012 only - Aug  20  2:00 1:00 S
> +Rule Morocco 2013 only - Jul   9  3:00 0 -
> +Rule Morocco 2013 only - Aug   8  2:00 1:00 S
> +Rule Morocco 2014 only - Jun  29  3:00 0 -
> +Rule Morocco 2014 only - Jul  29  2:00 1:00 S
> +Rule Morocco 2015 only - Jun  18  3:00 0 -
> +Rule Morocco 2015 only - Jul  18  2:00 1:00 S
> +Rule Morocco 2016 only - Jun   7  3:00 0 -
> +Rule Morocco 2016 only - Jul   7  2:00 1:00 S
> +Rule Morocco 2017 only - May  27  3:00 0 -
> +Rule Morocco 2017 only - Jun  26  2:00 1:00 S
> +Rule Morocco 2018 only - May  16  3:00 0 -
> +Rule Morocco 2018 only - Jun  15  2:00 1:00 S
> +Rule Morocco 2019 only - May   6  3:00 0 -
> +Rule Morocco 2019 only - Jun   5  2:00 1:00 S
> +Rule Morocco 2020 only - May  24  2:00 1:00 S
> +Rule Morocco 2021 only - May  13  2:00 1:00 S
> +Rule Morocco 2022 only - May   3  2:00 1:00 S
> +Rule Morocco 2023 max - Apr  lastSun 2:00 1:00 S
>  
>  # Zone NAME  GMTOFF RULES FORMAT [UNTIL]
>  Zone Africa/Casablanca -0:30:20 - LMT 1913 Oct 26


Erik Homoet
Business Consultant
quintessence consulting AMS
mobile: +31 614534022
email: ehomoet at quintessence.net
skype: erik_qc_ams





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