clock daylight-saving-time

Function

The clock daylight-saving-time command sets the start time and end time of the daylight saving time.

The undo clock daylight-saving-time command deletes the daylight saving time setting.

By default, the daylight saving time is disabled.

Format

clock daylight-saving-time dstname one-year start-time start-date end-time end-date offset

clock daylight-saving-time dstname repeating start-time repeat-start-date end-time repeat-end-date offset [ startyear [ endyear ] ]

clock daylight-saving-time dstname repeating start-time { { first | second | third | fourth | last } startweekday startmonth end-time { first | second | third | fourth | last } endweekday endmonth } offset [ startyear [ endyear ] ]

undo clock daylight-saving-time

Parameters

Parameter	Description	Value
dstname	specifies the name of summer time zone. It is a string data type. The string length range is from 1 to 32 characters.	The value is a string of 1 to 32 characters, spaces not supported. When quotation marks are used around the string, spaces are allowed in the string.
one-year start-time	Sets the summer start time to a specific year.	HH specifies the hour, which is an integer ranging from 0 to 23. MM specifies the minute, which is an integer ranging from 0 to 59.
start-date	Specifies the daylight saving start date in the format of YYYY-MM-DD.	YYYY specifies the year, which is an integer ranging from 2000 to 2037. MM specifies the month, which is an integer ranging from 1 to 12. DD specifies the day, which is an integer ranging from 1 to 31.
end-time	Specifies the daylight saving end time in the format of HH:MM.	HH specifies the hour, which is an integer ranging from 0 to 23. MM specifies the minute, which is an integer ranging from 0 to 59.
end-date	Specifies the daylight saving end date in the format of YYYY-MM-DD.	YYYY specifies the year, which is an integer ranging from 2000 to 2037. MM specifies the month, which is an integer ranging from 1 to 12. DD specifies the day, which is an integer ranging from 1 to 31.
offset	Specifies the time offset added to the summer time.	The value is in the format of HH:MM, where HH indicates the hour and MM indicates the minute. The value ranges from 00:01 to 02:00.
repeating start-time	Configures summer time for set of years.	HH specifies the hour, which is an integer ranging from 0 to 23. MM specifies the minute, which is an integer ranging from 0 to 59.
repeat-start-date	specifies the start date, when configures summer time to the years from a certain year.	It is in the format of MM-DD. The value of MM ranges from 1 to 12; the value of DD ranges from 1 to 31.
repeat-end-date	specifies the start date, when configures summer time to the years from a certain year.	It is in the format of MM-DD. The value of MM ranges from 1 to 12; the value of DD ranges from 1 to 31.
startyear	specifies the start year, when configures summer time to the years from a certain year.	It is in the format of YYYY. The value of YYYY ranges from 2000 to 2037.
endyear	specifies the end year, when configures summer time to the years from a certain year.	It is in the format of YYYY. The value of YYYY ranges from 2000 to 2037.
first	Indicates the first working day in a specified month.	-
second	Indicates the second working day in a specified month.	-
third	Indicates the third working day in a specified month.	-
fourth	Indicates the fourth working day in a specified month.	-
last	Indicates the last working day in a specified month.	-
startweekday	Specifies the start weekday.	The value range is Mon, Tue, Wed, Thu, Fri, Sat, Sun.
startmonth	Specifies the start month.	The value range is Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov and Dec.
endweekday	Specifies the end weekday.	The value range is Mon, Tue, Wed, Thu, Fri, Sat, Sun.
endmonth	Specifies the end month.	The value range is Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov and Dec.

Views

System view

Default Level

3: Management level

Task Name and Operations

Task Name	Operations
system	write

Usage Guidelines

Usage Scenario

When the configuration becomes effective, you can use the display clock command to check the configuration. In addition, the message time such as log time and debug time is displayed in the configured summer time.

In VS mode, this command is supported only by the admin VS.

Configuration Impact

Note the following issues:

The time in messages such as logs and debugging information is the local time adjusted according to the time zone and the configured daylight saving time.
The time in the output of the display commands is the local time adjusted based on the time zone and the configured daylight saving time.

Before you remove the configuration of the daylight saving time, note the following points:

If the configured daylight saving time has taken effect, after you remove the configuration of the daylight saving time, the router minus the offset of the daylight saving time.
If the configured daylight saving time does not take effect, removing the configuration of the daylight saving time does not affect on the system time.

Follow-up Procedure

Run the display clock command to view detailed information about the system time after the configured daylight saving time takes effect.

Example

# Set the daylight saving time named z2 starting from 2020-02-01, 11:22 and ending on 2020-08-11, 22:11, with an offset of 01:04.

<HUAWEI> system-view
[~HUAWEI] clock daylight-saving-time z2 one-year 11:22 2020-02-01 22:11 2020-08-11 01:04

# Set the daylight saving time named z3 of repeating-date type with optional parameters start-year of 2012 and end-year of 2020 with an offset of 01:04.

<HUAWEI> system-view
[~HUAWEI] clock daylight-saving-time z3 repeating 08:00 02-01 22:11 08-08 01:04 2012 2020