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 <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?

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
_______________________________________________
users mailing list -- users@lists.fedoraproject.org
To unsubscribe send an email to users-le...@lists.fedoraproject.org
Fedora Code of Conduct: 
https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives: 
https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org

Reply via email to