Model 5601MSC
Model 5601MSC Master SPG/Master Clock System
Page - 144 Revision 2.2 MASTER CLOCK
How does the transition to DST start?
Let's say that DST starts at 2:00 am local time and DST is one hour ahead of standard time:
DST or normal? Comments
DST started, time advanced by one hour
Note that local time is never 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 from DST end?
Let's say that DST ends at 2:00 am local time and DST is one hour ahead of standard time:
DST or normal? Comments
…3556 seconds from 01:00:02 to 01:59:57 daylight saving time not shown…
Time is turned back to normal
…3556 seconds from 01:00:02 to 01:59:57 standard time not shown…
Note that local time between 1:00:00 and 1:59:59 actually is repeated twice this day, first during DST
time, then clocks are turned back one hour to normal time, and the hour is repeated during standard
time and therefore this day has 25 hours (instead of 24 hours). To avoid confusion when referring to
time within this hour, it is important to tell whether it happened before or after the change back to
normal time. For further information about daylight saving time in your area consult the web page
http://www.timeanddate.com/time/aboutdst.html
.
Because of the variation of daylight saving time rules throughout the world, the 5601MSC has several
menu items to allow the user to set the DST rules for their region. These rules affect all outputs for
which DST is enabled.
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