JUNOSe 9.1.x System Basics Configuration Guide > Configuring the System Clock > Setting the System Clock Manually

Setting the System Clock Manually

Before you set the system clock, obtain the following information about your time zone:

• The name of the time zone
• The difference (offset) between the time zone and UTC
• The dates and times of transitions to and from summer time (daylight saving time)
• The difference between the standard time and summer time (daylight saving time)

The international Web site www.timeanddate.com contains information about time zones.

NOTE: Be sure to set the time zone (default is UTC) and summer time dates before you set the clock.

You can set the system clock at any time. This process involves the following steps:

1. Set the time zone.
2. Set the summer time dates.
3. Set the time.
4. Check the clock settings.

clock set

• Use to set the time and date on your system manually.
• Use the following syntax for setting the time: HH:MM:SS. This is the current time in 24-hour format—hours:minutes:seconds.
• There are two acceptable date forms for this command. Both produce the same display when you run the show clock command.

• Day:month:year
• Month:day:year

• Examples

host1#clock set 08:12:42 12 March 2000

host1#clock set 11:12:55 March 10 2000

• There is no no version.

clock summer-time date

• Use to set the clock to switch automatically to summer time (daylight saving time).
• Example

host1(config)#clock summer-time PDT date 1 April 200X 2:00 

31 October 200X 2:00 60

• Use the no version to prevent automatic switching to summer time.

clock summer-time recurring

• Use to set the clock to summer time at the same time each year.
• Example—This overrides the default settings for PDT,

host1(config)#clock summer-time PDT recurring first Sunday April 2:00 last 
Sunday October 2:00

• Use the no version to prevent automatic switching to summer time.

clock timezone

• Use to set the time zone for display.
• Example—This sets the time zone to 5 hours behind UTC.

host1(config)#clock timezone EST -5

• Use the no version to set the time zone to UTC, the default setting.

show clock

• Use to display the system time and the date.
• Example 1—Shows time source value when clock is manually configured

host1#show clock detail

TUE JAN 23 2007 11:50:47 UTC

time source: manually entered by user

timezone: UTC (0 minutes from UTC)

• Example 2—Shows time source value when clock is synchronized with NTP

host1#show clock detail

TUE JAN 23 2007 11:50:47 UTC

time source: Configured via NTP

timezone: UTC (0 minutes from UTC)