Manual

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Москва, Новозаводская ул., 18, стр. 1
353
Chapter 42 Summer Time Configuration
42.1 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.
42.2 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.
42.3 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.
Configuration procedure is as follows: