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
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