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Matrix ETERNITY NE System Manual
Daylight Saving Time (DST)
What's this?
Daylight Saving Time (DST) is the practice of advancing clocks so that afternoons have more daylight and
mornings have less. Typically clocks are adjusted forward one hour near the start of spring and are adjusted
backward in autumn.
Many countries of the world use DST, though the start and end dates of DST vary with location and year. Even
within countries, uniform DST may not be observed. For example the states of Arizona and Hawaii do not observe
DST. Certain countries may observe DST in certain years, for instance Guatemala, while in most countries of Asia
and Africa, and in certain countries of South America, DST is not observed at all.
When ETERNITY is installed in a country/region where DST is used, it is necessary to synchronize the Real Time
Clock of ETERNITY NE with the local time.
So, if you are installing ETERNITY in a country where DST is used, find out the DST convention currently in use in
that country, and adjust DST accordingly.
How it works
The forward and backward adjustment of clocks can be Scheduled or Manual.
•
Scheduled DST Adjustment:
The Real Time Clock of the ETERNITY is advanced and set backward
automatically according to the DST convention of the country/region where the ETERNITY is installed.
Scheduled DST Adjustment is useful in countries/regions where DST Time is fixed, e.g. Europe, USA and
Canada without yearly variations.
The table below gives describes the DST conventions followed in the different countries for which
ETERNITY will automatically adjust DST.
The DST Type is to be selected according to the country/region where the system is installed.
When DST Mode is set to 'Scheduled' and the DST Type is selected, the system will automatically adjust
DST at the preset dates and time for the country/region where the system is installed.
For example, if ETERNITY is installed Spain, the DST Type 01 applicable to this country should be
programmed as Scheduled DST. The system will automatically advance the clock on the last Sunday of
March at 01.59.03:00 am every year (the start date of DST) and set the clock backward on the last Sunday
of October at 02.59.02:00 am of the same year.
•
Manual DST Adjustment:
The Real Time Clock of the ETERNITY is advanced and set backward
manually according to the DST convention of the country/region where the ETERNITY is installed.
Manual DST Adjustment is to be used in regions/countries that have no fixed DST Convention and where
yearly variations in DST practices are likely.
When DST Mode is set as 'Manual', you must program the start and the end time, i.e. the time at which the
clock is to be advanced and the time at which the clock is to be delayed.
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