On 3/22/22 05:40, Almaz Mingaleev wrote:
Here are the last transitions in Africa/Casablanca output (rearguard format):
transition,type,[UTC time],[Type offset],[Type isDST] 3672612000,1,2086-05-19T02:00:00Z,PT1H,DST 3699828000,2,2087-03-30T02:00:00Z,PT0S,STD 3703456800,3,2087-05-11T02:00:00Z,PT1H,STD
So change is from standard to standard, even though offset changes from 0h to 1h. Is that expected behaviour?
Yes, as tzdb frowns on permanent daylight saving time for reasons discussed recently. This issue occurs due to the rearguard format's contortion of post-2018 Morocco data to pretend that standard time is daylight saving and vice versa. Even with that contortion, we don't want the normal post-2087 prediction (standard time only) to be contorted into a rearguard post-2087 prediction of daylight saving only.