Default Time Zone
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:
[edit system] time-zone (GMThour-offset | time-zone);
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:
[edit]
user@host# set system time-zone America/New_York
[edit]
user@host# show
system {
time-zone 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.