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Fat AP and Cloud AP V200R010C00 Command Reference

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clock daylight-saving-time

clock daylight-saving-time

Function

The clock daylight-saving-time command sets the name, start time, and end time of the daylight saving time (DST).

The undo clock daylight-saving-time command cancels the DST settings.

By default, the DST is not used.

Format

clock daylight-saving-time time-zone-name one-year start-time start-date end-time end-date offset

clock daylight-saving-time time-zone-name repeating start-time { { first | second | third | fourth | last } weekday month | start-date1 } end-time { { first | second | third | fourth | last } weekday month | end-date1 } offset [ start-year [ end-year ] ]

undo clock daylight-saving-time

Parameters

Parameter Description Value
time-zone-name Specifies the name of the DST zone. The value is a string of 1 to 32 characters.
one-year Specifies the absolute DST. -
repeating Specifies the periodic DST. -
start-time Specifies the start time of the DST.

The start time is in the 24-hour format 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. If MM is not specified, the DST starts on the hour. You must enter at least one digit to specify HH. For example, when you enter 0, the start time is 00:00.

start-date Specifies the start date of the DST. The start date is in the format YYYY-MM-DD. The value of YYYY ranges from 2000 to 2030, the value of MM ranges from 1 to 12, and the value of DD ranges from 1 to 31.
end-time Specifies the end time of the DST.

The start time is in the 24-hour format 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. If MM is not specified, the DST starts on the hour. You must enter at least one digit to specify HH. For example, when you enter 0, the start time is 00:00.

end-date Specifies the end date of the DST. The end date is in the format YYYY-MM-DD. The value of YYYY ranges from 2000 to 2030, the value of MM ranges from 1 to 12, and the value of DD ranges from 1 to 31.
first Specifies the first workday in a month. -
second Specifies the second workday in a month. -
third Specifies the third workday in a month. -
fourth indicates the fourth workday in a month. -
last Specifies the last workday in a month. -
weekday Specifies a day of the week. The value is Mon, Tue, Wed, Thu, Fri, Sat, or Sun.
month Specifies a month. The value is Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, or Dec.
start-date1 Specifies the start date of the DST. The start date is in the format MM-DD. The value of MM ranges from 1 to 12, and the value of DD ranges from 1 to 31.
end-date1 Specifies the end date of the DST. The end date is in the format MM-DD. The value of MM ranges from 1 to 12, and the value of DD ranges from 1 to 31.
offset Specifies the DST offset. The offset is in the 24-hour format HH:MM. HH specifies the hour, which is an integer ranging from 0 to 2. MM specifies the minute, which is an integer ranging from 0 to 59. If MM is not specified, the offset is the specified hours. You must enter at least one digit to specify HH.

The offset should be shorter than or equal to 2 hours.

start-year Specifies the start year. The value is in the format YYYY and ranges from 2000 to 2030.
end-year Specifies the end year. The value is in the format YYYY and ranges from 2000 to 2030.

Views

User view

Default Level

3: Management level

Usage Guidelines

Usage Scenario

Daylight Saving Time (DST), also referred to as summer time, is a convention established by people for saving resources. In high latitude areas, it is earlier in summer than in winter at sunrise. To reduce evening usage of incandescent lighting and save energy, clocks are adjusted forward one hour.

Users can customize the DST zone according to their countries' or regions' convention. In addition, users can set how long clocks are adjusted forward, usually an hour. With DST enabled, when it is time to start DST, the system time is adjusted according to the user-specified DST. When it is time to end DST, the system time automatically returns to original time.

Configuration Impact

To configure the DST, note the following:
  • The time in logs and debugging information uses the local time adjusted based on the time zone and the configured DST.
  • The time in the output of the display commands uses the local time adjusted based on the time zone and the configured DST.
To remove configurations for the DST, note the following:
  • If the DST already takes effect when you remove the configurations, the device will adjust its clock by subtracting the value of the offset parameter from the current time.
  • If the DST does not take effect, removing the configurations will not affect the system time.

Precautions

  • The DST is configured in the summer. The DST duration ranges from one day to one year.

  • You can configure the start time and end time for periodic DST in one of the following modes: date+date, week+week, date+week, and week+date.

  • This configuration is not reset after the reset factory-configuration command is executed.

Example

# Set the periodic DST.
<Huawei> clock daylight-saving-time bj repeating 0 first sun jan 0 first sun apr 2 2009 2009
# Set the periodic DST by day.
<Huawei> clock daylight-saving-time bj repeating 12:11 1-1 1:0 3-4 1
# Set the absolute DST.
<Huawei> clock daylight-saving-time bj one-year 12:11 2010-10-2 1:00 2010-11-4 1
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Updated: 2019-11-21

Document ID: EDOC1100064352

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