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?

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