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Daylight Savings Time
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Daylight Savings Time
The SMC6624M switch provides a way to automatically adjust the system
clock for Daylight Savings Time (DST) changes. In addition to the value “none”
(no time changes), there are five pre-defined settings, named:
■ Alaska
■ Canada and Continental US
■ Middle Europe and Portugal
■ Southern Hemisphere
■ Western Europe
The pre-defined settings follow these rules:
Alaska:
• Begin DST at 2am the first Sunday on or after April 24th.
• End DST at 2am the first Sunday on or after October 25th.
Canada and Continental US:
• Begin DST at 2am the first Sunday on or after April 1st.
• End DST at 2am the first Sunday on or after October 25th.
Middle Europe and Portugal:
• Begin DST at 2am the first Sunday on or after March 25th.
• End DST at 2am the first Sunday on or after September 24th.
Southern Hemisphere:
• Begin DST at 2am the first Sunday on or after October 25th.
• End DST at 2am the first Sunday on or after March 1st.
Western Europe:
• Begin DST at 2am the first Sunday on or after March 23rd.
• End DST at 2am the first Sunday on or after October 23rd.
A sixth option named “User defined” allows the user to customize the DST
configuration by entering the beginning month and date plus the ending month
and date for the time change. The menu interface screen looks like this (all
month/date entries are at their default values):