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@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?
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.