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sol14113: Cron job date/time may not be updated when the system time zone is changed
Known IssueKnown Issue

Original Publication Date: 01/07/2013
Updated Date: 10/12/2016

Known Issue

After you change the BIG-IP system time zone, the cron daemon may not update the effective change of date and time to the existing cron jobs.

This issue occurs when all of the following conditions are met:

  • There are cron jobs configured in the BIG-IP system.
  • The BIG-IP system time zone was changed, with a difference of at least one hour.


A scheduled cron job runs at the date and time that is based on the previous time zone, and not based on the updated time zone.


As a result of this issue, you may encounter following symptom:

  • The cron jobs that you expect to run at the date or time that is based on the newly updated time zone do not occur.

    For example:

    The BIG-IP system has a log rotation cron job configured, by default, to start daily at 4:02 a.m. However, when you change the system time zone, the log may be rotated at a different time.



F5 Product Development has assigned ID 384208 to this issue. F5 has confirmed that this issue exists in the products listed in the Applies To box, located in the upper-right corner of this article. For information about releases or hotfixes that resolve this issue, refer to the following table:

Type of FixVersions FixedRelated Articles


To work around this issue, you can restart the cron daemon after you change the time zone of the BIG-IP system. To do so, perform the following procedure:

Impact of workaround: Performing the following procedure should not have a negative impact on your system.

  1. Log in to the BIG-IP command line.
  2. Restart the cron daemon by typing the following command:

    bigstart restart crond

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