clock summer-time
Use clock summer-time to configure the device to use daylight saving time during a specific period of time.
Use undo clock summer-time to cancel the configuration.
Syntax
clock summer-time name start-time start-date end-time end-date add-time
undo clock summer-time
Default
Daylight saving time is disabled.
Views
System view
Pre-defined user roles
network-admin
mdc-admin
Parameters
name: Specifies a name for the daylight saving time schedule, a case-sensitive string of 1 to 32 characters.
start-time: Specifies the start time in the hh:mm:ss format. The hh value is in the range of 0 to 23, the mm value is in the range of 0 to 59, and the ss value is in the range of 0 to 59. The leading zero in a segment can be omitted. If the seconds segment is 0 (hh:mm:00), you can omit it. If both the minutes and seconds segments are 0 (hh:00:00), you can omit both of the segments. For example, to specify 08:00:00, you can enter 8.
start-date: Specifies the start date in one of the following formats:
MM/DD. The MM value is in the range of 1 to 12, and the value range for DD depends on the month value.
month week date, where:
month—Takes January, February, March, April, May, June, July, August, September, October, November or December.
week—Represents week of the month. It takes first, second, third, fourth, fifth, or last.
day—Takes Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, or Saturday.
end-time: Specifies the end time in the hh:mm:ss format. The hh value is in the range of 0 to 23, the mm value is in the range of 0 to 59, and the ss value is in the range of 0 to 59. The leading zero in a segment can be omitted. If the seconds segment is 0 (hh:mm:00), you can omit it. If both the minutes and seconds segments are 0 (hh:00:00), you can omit both of the segments. For example, to specify 08:00:00, you can enter 8.
end-date: Specifies the end date in one of the following formats:
MM/DD. The MM value is in the range of 1 to 12, and the value range for DD depends on the month value.
month week date, where:
month—Takes January, February, March, April, May, June, July, August, September, October, November or December.
week—Represents week of the month. It takes first, second, third, fourth, fifth, or last.
day—Takes Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, or Saturday.
add-time: Specifies the time to be added to the standard time, in the hh:mm:ss format. The hh value is in the range of 0 to 23, the mm value is in the range of 0 to 59, and the ss value is in the range of 0 to 59. The leading zero in a segment can be omitted. If the seconds segment is 0 (hh:mm:00), you can omit it. If both the minutes and seconds segments are 0 (hh:00:00), you can omit both of the segments. For example, to specify 08:00:00, you can enter 8.
Usage guidelines
The daylight saving time, together with the UTC time and local time zone, determines the system time. You can use the display clock command to view the system time.
A correct system time setting is essential to network management and communication. Set the system time correctly or use NTP to synchronize your device with a trusted time source before you run it on the network.
Examples
# Set the system time ahead 1 hour for the period between 06:00:00 on 08/01 and 06:00:00 on 09/01.
<Sysname> system-view [Sysname] clock summer-time PDT 6 08/01 6 09/01 1
Related commands
clock protocol
clock timezone
display clock