[tz] FW: [Ext] The TZ Coordination
milamberspace at gmail.com
Sun May 31 14:03:50 UTC 2020
On 5/31/20 12:09 PM, Florian Weimer wrote:
> * Paul Eggert:
>> On 5/30/20 7:00 AM, Florian Weimer wrote:
>>>> Would this be a good opportunity to engage with the government of Morocco
>>>> to encourage them to give more warning?
>>> My understanding is that at present, they don't know themselves in
>> Yes, I think you're right.
>>> They would have to redefine the criteria to something based
>>> exclusively on astronomical calculations
>> That shouldn't be necessary, as they're using a conservative
>> approximation; that is, it's OK if their approximation is a bit off
>> because all they need to do is to bracket the actual Ramadan rather
>> than predict its Gregorian dates exactly. If they had an algorithm
>> they could publish it and we could use it. And it would be
>> technically feasible for them to have an algorithm; see the
>> Morocco-prediction code in the tzdb 'africa' file for an example
> It looks like the algorithm predicted correctly the data of Eid
> al-Fitr as 24 May, but the derivation of the end date from that is
> suspicious. I think it would make more sense if the time change does
> not happen on Eid itself.
In Morocco (where I live), the end of Ramadan (arabic month) is follow
by the Eid al-Fitr, and concretely it's 1 or 2 day off for the people
(with traditional visiting of family, big lunches/diners, etc.). So for
this year the astronomical calculations don't include the following 2
day off in the calc. This 2 days have fall in a Sunday/Monday, so it's
not acceptable by people to have a time shift during these 2 day off.
Perhaps, you can modify the (predict) rules for next years : if the end
of Ramadan is a (probable) Friday or Saturday (and so the 2 day off is
on a weekend), the next time shift will be the next weekend.
> A rule like this would ensure that Eid
> still uses the same time as Ramadan in every year, which is likely
> what people expect.
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