User manual

TCDS Series User Manual – Rev. 2.0.1 Page 17
Time Zone Offsets
The TCDS time display maintains time as UTC initially. A time zone offset or bias can be provided to
adjust the time for display purposes. A bias can be set as a positive (+) or negative (-) value with a
resolution of one second.
If the time code being input into the TCDS is different from UTC do not adjust the time zone
and/or DST offset.
Daylight Saving Time
An automatic daylight saving time (summer time for European Union) adjustment can be configured
separately and in addition to a time zone offset.
The incoming time code must have a date encoded in a format recognized by the TCDS
for daylight savings time adjustments to be performed. For best reliability Masterclock
recommends a time code source that encodes full date information, such as
Masterclock’s GPS200A time code generator.
For SMPTE time codes, date must be encoded to the Leitch specification. IRIG-B date decoding is
supported for the IEEE 1344 standard. Masterclock’s master clock system also supports these
specifications.
Pre 2007 Standard – U.S.A. and Canada
Traditional US/Canada daylight/summer time is configured as one (1) hour positive bias. For
the U.S. (through 2006) and Canada, daylight savings time begins on the first Sunday of April
at 2:00AM (Local Time) and ends on the last Sunday of October at 2:00AM (Local Time).
Post 2006 Standard – U.S.A. and Canada
On August 8, 2005, the Energy Policy Act of 2005 was signed. This Act changed the time
change dates for Daylight Saving Time in the U.S, effective in 2007. DST now begins on the
second Sunday of March at 2:00 AM (Local Time) and end the first Sunday of November at
2:00 AM (Local Time).
EU Standard – European Union
In the European Union, daylight change times are defined relative to the UTC time of day
instead of local time of day (like in the U.S.). For the European Union, summertime period
begins at 1:00 AM UTC on the last Sunday of March and ends at 1:00 AM UTC on the last
Sunday of October. European customers, please carefully consult the section entitled Device
Settings for details on setting daylight time.
To ensure proper year-around operation, daylight time adjustments must be configured
using the daylight time option and not with the time zone offset option.