Bug 435765

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User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.12) Gecko/20080201 Firefox/2.0.0.12

Description of problem:
If you use a date with 'at' to schedule a job in the gap between 2am and 3am on the morning that daylight saving time begins, then at will reschedule the job for after 3am.  (This makes sense, since the hour between 2 and 3 doesn't exist on that day.)

But if you use a day of the week with at, it will schedule the job an hour earlier, between 1 and 2.

> date
Mon Mar  3 10:19:39 PST 2008
> at -f ./attest 0230 Mar9
job 29 at Sun Mar  9 03:30:00 2008
> at -f ./attest 0230 sunday
job 30 at Sun Mar  9 01:30:00 2008

Something similar also happens in the fall:

> at -f ./attest 0230 Nov2
job 31 at Sun Nov  2 02:30:00 2008
> at -f ./attest 0230 sunday + 34 weeks
job 32 at Sun Nov  2 01:30:00 2008



Version-Release number of selected component (if applicable):
at-3.1.10-19.fc8

How reproducible:
Always


Steps to Reproduce:
1. echo "date >> /tmp/xxx" > attest
2. set the date to be the week before Mar 9, 2008
3. at -f ./attest 0230 Mar9
4. at -f ./attest 0230 sunday

Actual Results:
job 29 at Sun Mar  9 03:30:00 2008
job 30 at Sun Mar  9 01:30:00 2008


Expected Results:
job 29 at Sun Mar  9 03:30:00 2008
job 30 at Sun Mar  9 03:30:00 2008


Additional info:
Granted, this is an obscure problem that will only occur in two hours of the year.

I'm not even sure that rescheduling jobs that fall into the DST gap an hour later is the proper thing to do.  I would think, however, that all jobs should be rescheduled the same way, regardless of the format used to specify the time and date.