On 2020-04-08 20:21, Patrick O'Callaghan wrote:
> On Wed, 2020-04-08 at 17:06 +0800, Ed Greshko 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 <terry1@xxxxxxxxxxx> 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?
> It can happen when switching from summer time (i.e. "fall back"),
> though not on switching to summer time ("spring forward"), which of
> course is the OP's case.
>
> I don't know how it works where you live, but in the UK the autumn
> switch occurs at 2am, which reverts back to being 1am. Thus a time such
> as 1:30am occurs twice, and events programmed for that time can be
> triggered twice.
>
BUT, we are specifically addressing the OP's situation and the time in his crontab ISN'T within the
time frame of when BST (the OP is in the UK) starts/ends.
Daylight saving time 2020 in United Kingdom began at 1:00 AM on
Sunday, March 29
and ends at 2:00 AM on
Sunday, October 25
All times are in United Kingdom Time.
Not near 23:01 which is the OP's cron start time.
--
The key to getting good answers is to ask good questions.
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