On 2020-04-08 20:01, Andy Paterson via users wrote:
> I understood crontab used UTC time - daylight saving shouldn't apply
>

Not unless you set the CRON_TZ variable. 

Also, if that were the case then the man page wouldn't need to tell you....

   Daylight Saving Time and other time changes
       Local time changes of less than three hours, such as those caused by the
       Daylight Saving Time changes, are handled in a special way.   This  only
       applies  to  jobs  that  run at a specific time and jobs that run with a
       granularity greater than one hour.  Jobs that run  more  frequently  are
       scheduled normally.

       If time was adjusted one hour forward, those jobs that would have run in
       the interval that has been skipped will be run immediately.  Conversely,
       if time was adjusted backward, running the same job twice is avoided.

       Time  changes  of  more than 3 hours are considered to be corrections to
       the clock or the timezone, and the new time is used immediately.

       It is  possible  to  use  different  time  zones  for  crontables.   See
       crontab(5) for more information.


-- 
The key to getting good answers is to ask good questions.
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