Jordan definition problem

Jesper Nørgaard jnorgard at
Mon Apr 6 22:50:29 UTC 2009

There is a subtle problem in the Tzdata2009e file about Jordan:

> The Council of Ministers decided in 2002 to adopt the principle of timely
> submission of the summer at 60 minutes as of midnight on the last Thursday
> of the month of March of each year.

The problem is quite similar to the problem of the San Luis timezone in
Argentina. The rule is this time Last Thursday in March at midnight, but has
been implemented in 2009e as Last Friday in March, which is not the same.
The problem occurs first in 2005, where starts DST Thursday
the of March at 23:59:59, while the rules of 2009e will impose DST to
start Friday the of March 2005 at 0:00.

In the tz database there are quite a lot of midnight-rules, however all have
been end of DST thus it was possible to say 23:00s instead of 24:00. I
wonder if there is a problem making the following definition:
> ! Rule	Jordan	2002	max	-	Mar	lastThu	24:00s	1:00
If there is, it might be necessary to hand-code the dates where Last
Thursday of March is the

Regards, Jeser Nørgaard Welen

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