PLANET WGSW-52040 - Manual (Page 487)

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Chapter 64 Summer Time Configuration
64.1 Introduction to Summer Time
Summer time is also called daylight saving time, it is a time system for saving energy sources. In summer the
time is advanced 1 hour to keep early hours, reduce the lighting, so as to save electrolighting. The rule that
adopt summer time is different in each country. At present, almost 110 countries implement summer time.
Compare with the standard time, usually set summer time 1 hour late, for example, when summer time is
implementing, 10:00 am of the standard time is considered 11:00 am of summer time.
64.2 Summer Time Configuration Task Sequence
1. Configure absolute or recurrent time range of summer time
Command Explanation
Global Mode
clock summer-time <word> absolute
<HH:MM> <YYYY.MM.DD> <HH:MM>
<YYYY.MM.DD> [<offset>]
no clock summer-time
Set absolute time range of summer time, start
and end summer time is configured with
specified year.
clock summer-time <word> recurring
<HH:MM> <MM.DD> <HH:MM> <MM.DD>
[<offset>]
no clock summer-time
Set recurrent time range of summer time,
every year the summer time begins from the
start time and end at the end time.
clock summer-time <word> recurring
<HH:MM> <week> <day> <month>
<HH:MM> <week> <day> <month>
[<offset>]
no clock summer-time
Set recurrent time range of summer time,
every year the summer time begins from the
start time and end at the end time.
64.3 Examples of Summer Time
Example1:
The configuration requirement in the following: The summer time from 23:00 on April 1th, 2012 to 00:00 on
October 1th, 2012, clock offset as 1 hour, and summer time is named as 2012.