> A first step to debug date issues is to check current timezone

Thanks Max.

>     (getenv "TZ")

This returns nil

>     $ timedatectl

And this returns

               Local time: mié 2022-03-30 12:17:36 CEST
           Universal time: mié 2022-03-30 10:17:36 UTC
                 RTC time: mié 2022-03-30 10:17:37
                Time zone: Europe/Madrid (CEST, +0200)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no

> I have not looked what changed in emacs in respect to timezones.

The function `encode-time', which is implemented in C, has changed,
since it returns different things in Emacs 27 and Emacs 29, when it
receives as argument the return value of (org-parse-time-string
<timestamp>).

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