Sntp-Server Timezone - HP ProCurve 420 Management And Configuration Manual

Command Line Reference
System Management Commands
6-22
Example
This sets daylight savings time to be used from March 31st to October 31st.
HP420(config)#sntp-server daylight-saving
Enter Daylight saving from which month<1-12>: 3
and which day<1-31>: 31
Enter Daylight saving end to which month<1-12>: 10
and which day<1-31>: 31
HP420(config)#

sntp-server timezone

This command sets the time zone for the access point's internal clock.
Syntax
sntp-server timezone <hours>
hours - Number of hours before/after UTC. (Range: -12 to +12 hours)
Default Setting
None
Command Mode
Global Configuration
Command Usage
This command sets the local time zone relative to the Coordinated
Universal Time (UTC, formerly Greenwich Mean Time or GMT), based on
the earth's prime meridian, zero degrees longitude. To display a time
corresponding to your local time, you must indicate the number of hours
and minutes your time zone is east (before) or west (after) of UTC.
Example
HP420(config)#sntp-server timezone +8
HP420(config)#