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Modifying the Default Time Zone for a Router or Switch Running Junos OS

The default local time zone on a router or a switching device is UTC (Coordinated Universal Time, formerly known as Greenwich Mean Time, or GMT). To modify the local time zone, include the time-zone statement at the [edit system] hierarchy level:

You can use the GMT hour-offset option to set the time zone relative to UTC (GMT) time. By default, hour-offset is 0. You can configure this to be a value in the range from –14 to +12.

You can also specify time-zone as a string such as PDT (Pacific Daylight Time) or WET (Western European Time), or specify the continent and major city.


Junos OS complies with the POSIX time-zone standard, which is counter-intuitive to the way time zones are generally indicated relative to UTC. A time zone ahead of UTC (east of the Greenwich meridian) is commonly indicated as GMT +n; for example, the Central European Time (CET) zone is indicated as GMT +1. However, this is not true for POSIX time zone designations. POSIX indicates CET as GMT-1. If you include the set system time-zone GMT+1 statement for a router or a switch in the CET zone, your device time will be set to one hour behind GMT, or two hours behind the actual CET time. For this reason, you might find it easier to use the POSIX time-zone strings, which you can list by entering set system time-zone ?.

For the time zone change to take effect for all processes running on the router or switch, you must reboot the router or switch.

The following example shows how to change the current time zone to America/New_York:

Starting in Junos OS Release 15.1F6, for the routers with the RE-MX-X6, RE-MX-X8, and RE-PTX-X8 Routing Engines, the date and time zones are synchronized from the admin guest Junos OS to the host OS. Thus, the guest OS and the host OS use the same time zone and there is no difference in the timestamps in system log files of Junos OS and the host OS. This time zone and date synchronization changes the time zone of the host from the default UTC to the configured time zone. However, for the time zone change to take effect for all processes running on the router, reboot the router by using the request vmhost reboot command.