Bug#1076385: tzdata: Wrong time conversion between IST and CEST timezone, using /usr/bin/date.

["Adam D. Barratt" <adam@adam-barratt.org.uk>]

On Mon, 2024-07-15 at 15:53 +0200, Michal Heppler wrote:
> I noticed that thew `date -d ...` utility converts time between EST
> and CEST timezone in wrong way. The time is shifted by 1 hour later:
> 
> # cat /etc/timezone
> Europe/Prague
> # date -d '7:00AM EST'
> Po 15. července 2024, 14:00:00 CEST
> 
> Env. LANG and LC_* does not change result, just not localised:
> 
> # date -d '07:00 EST'
> Mon Jul 15 14:00:00 CEST 2024
> 
> The expected time is 13:00 CEST.

I may be missing something here, but... EST is UTC-0500, and CEST is
UTC+0200. The difference between the two is therefore 7 hours, which is
what the above shows.

Are you perhaps confusing the meanings of the "S" in each of the
abbreviations? While CEST is Central European Summer Time - i.e.
observing daylight savings - EST is Eastern _Standard_ Time, i.e. _not_
observing daylight savings. The equivalent of CEST for the Eastern
timezone is EDT.

Regards,

Adam