Juniper SYSTEM BASICS - CONFIGURATION GUIDE V 11.1.X Configuration Manual page 556

JUNOSe 11.1.x System Basics Configuration Guide
clock summer-time date
clock summer-time recurring
clock timezone
show clock
526
Setting the System Clock Manually
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.
See clock summer-time date.
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.
See clock summer-time recurring.
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.
See clock timezone.
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)
See show clock.