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Old 9-Nov-2014, 11:11 AM   #8
Senior Member
Join Date: Apr 2014
Location: Medford MA USA
Posts: 371
From the ATSC document a_65-2009.pdf (I can't get a clean link to it - just Google the name and you can see it), it's clear that the "time" is the absolute time, including the date.

From the format description of the STT,

"system_time A 32-bit unsigned integer quantity representing the current system time as then number of GPS seconds since 00:00:00 UTC, 6 January 1980."

So it's in the meta-data that each real channel transmits. Supposed to be accurate within a second.
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