I understood crontab used UTC time - daylight saving shouldn't apply

> On 8 Apr 2020, at 10:07, Ed Greshko <ed.gres...@greshko.com> wrote:
> 
> On 2020-04-08 16:56, Patrick O'Callaghan wrote:
>>> On Wed, 2020-04-08 at 07:52 +0800, Ed Greshko wrote:
>>> On 2020-04-08 07:27, Cameron Simpson wrote:
>>>> On 07Apr2020 07:07, Terry Barnaby <ter...@beam.ltd.uk> wrote:
>>>>> 01 23 * * 1 root /src/bbackup/bbackup-beam
>>>> [...]
>>>> 
>>>> 1:23am. Do not the timezone shifts happen at 2am (avoids horrible day 
>>>> changes if it happened at 12am). So 1:23am can happen twice if 2am steps 
>>>> back to 1am.
>>>> 
>>>> Our summer time just ended here. Might a similar shift have happened for 
>>>> you?
>>> Well, except that the format of the crontab is....
>>> 
>>> Minute  Hour Day-of-Month .....
>> How does that avoid the problem? The same time can still happen twice.
>> 
> 
> ????
> 
> How can 23:01 happen twice at the switch to/from DST?
> 
> -- 
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