DS_day_of_month [ATSC Semantics]
DS_day_of_month, is a five bit field in an ATSC System Time table which, when not equal to zero, signals the day of the month when the transport stream will either enter (if DS_status=0) or leave (if DS_status=1) daylight savings time. The date is calculated to be the Universal Coordinated Time date at which the change occurs locally.
PMCP equivalent:
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