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.
poc