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How can I make cron jobs run on GMT, not local time?

this is my crontab file:

#m  h           d   m   wday    command
5   0,6,12,18   *   *   *   ~/Documents/bash/transfer.sh

my jobs seem to be running at the local time (GMT+11) I am running os x snow leopard, but will move the code onto linux when development is complete.

The linux environment may be a shared environment where I may has less control over configuration.

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2 Answers 2

Not all versions of cron support running jobs using a time zone other than the system's.

If yours does, it's likely that the specification should be TZ=GMT or TZ=UTC (without the angle brackets). In some cases, the variable would be CRON_TZ.

The best thing to do is check the documentation specific to the particular system. See man 5 crontab.

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You perhaps could wrap the original crond binary.

mv /usr/sbin/crond /usr/sbin/crond.real
cat > /usr/sbin/crond
export TZ
exec crond.real ${1+"$@"}
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hello hlovdal, could you please explain these steps? –  compound eye Feb 24 '11 at 23:46
Are you copying crond to crond.real, then replacing crond with a short script, in which you set and export TZ, then execute crond.real? –  compound eye Feb 24 '11 at 23:55
Not copying but moving, but yes the rest of your analysis is correct. –  hlovdal Feb 25 '11 at 3:17

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