Configure Time Zones
SUMMARY The time zone represents a region that observes the same time. It is recommended that you set the time zone before you configure the date and time on the network device.
Modify 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.
Internet Assigned Numbers Authority (IANA) Time Zone
Junos OS devices use the tz database, also known as the IANA Time Zone Database to manage time zones. This database is periodically updated by IANA to reflect political and time changes. As such, you may need from time to time to update this file to ensure the Junos devices continue to accurately reflect worldwide time zones and daylight savings time intervals.
To update the IANA Time Zone Database, perform the following steps:
Import and Install Time Zone Files
The IANA Time Zone Database is maintained by the Internet Assigned Numbers Authority (IANA), which is a department of the Internet Corporation for Assigned Names and Numbers (ICANN). You can download the latest IANA Time Zone Database file from the following URL: http://www.iana.org/time-zones.
The following steps will guide you through one method of installing the file to your device. However, depending on your network access and other preferences, you may need to modify these steps.
Configure Custom Time Zone
To use a custom time zone, follow these steps: