[SOLVED] "at command" parses timespec incorrectly

Hi, all
I'd like to execute a command at UTC time.
But "at command" execute a command at the time one hour before when I specified.

this form is correct.
$this->bbcode_second_pass_quote('', '$') printf ": do nothing\n" | TZ=GMT+0 at 0400
warning: commands will be executed using /bin/sh
job 49 at Tue Apr 18 04:00:00 2017

[WarheadsSE]

https://linux.die.net/man/1/at

From all I can tell, your use of 'UTC' in the string is screwing it up.


https://www.archlinux.org/packages/community/x86_64/at/

If this is somehow a bug, this isn't something to report to us, unless you can somehow trace it down specifically to Arch Linux ARM

[h2o]

I found this article.
https://bugs.debian.org/cgi-bin/bugrepo ... bug=364975

This strange behavior seems to be related to daylight saving time.
I found out the cause, so I will consider how to avoid it.

[WarheadsSE]

If you're planning on have the running be at UTC, why not just use TZ=UTC0 in place of TZ=GMT+0 ?

[h2o]

Even if "UTC 0" is set, the behavior does not change.
The "at command" with the time specified in UTC seems to work correctly only during officially set daylight saving time.
"officially set daylight saving time" means the tm_isdst is set.
I live in areas which do not use daylight saving time, so the command is always scheduled an hour before.
I will specify an hour later to "At command".