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3.4.8. Daylight Saving Time Support
Daylight Saving Time (DST) or Summer Time as it is called in many countries, is a way of getting more
out of the summer days by advancing the clocks by one hour during the summer. Then, the sun will
appear to rise one hour later in the morning when people are usually asleep anyway, at the benefit of
one hour longer evenings when awake: The sunset and sunrise are one hour later than during normal
time.
To make DST work, the clocks have to be adjusted one hour ahead when DST begins, and adjusted
back one hour to standard time when DST ends. There are many countries observing DST, and many
who do not.
During the months March/April to September/October, the countries in the Northern Hemisphere are
having their summer and may observe DST, while the countries in the Southern Hemisphere are having
winter. During the rest of the year (September/October to March/April) the countries in the Southern
Hemisphere are having their summer and may observe DST, while the countries in the Northern
Hemisphere are having winter.
Daylight Saving Time is difficult to predict, as many countries change the transition days/principles
every year because of special happenings or conditions that have happened or will happen.
How does the transition to DST start?
Let's say that DST starts at 2:00 am local time and DST is one hour:
Local time
HH:MM:SS
01:59:58
01:59:59
03:00:00
03:00:01
03:00:02
Note that local time is never anything between 2:00:00 - 2:59:59 at the transition from standard time to
DST, this hour is skipped and therefore this day has only 23 hours (instead of 24 hours).
How does the transition to DST end?
Let's say that DST ends at 2:00 am local time and DST is one hour ahead of normal time:
Local time
HH:MM:SS
00:59:59
01:00:00
01:00:01
...3556 seconds from 01:00:02 to 01:59:57 daylight saving time not shown...
01:59.58
01:59.59
OPERATION
Model 8010TM-IRIG SDI Time Code Master with IRIG Reader Manual
DST start transition
DST or normal?
normal
normal
DST
DST
DST
DST end transition
DST or normal?
Revision 1.4.1
Comments
DST started, time advanced by one hour
DST
DST
DST
DST
DST
Comments
Page 3-12
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