I wonder if anyone else has noticed a DST(Daylight Savings Time) issue today.
This morning, I happened to check the guide information on my Vizio VX32L on Channel 4-1. I was looking for the program schedule information imbedded in the PSIP, and I happened to notice that the clock was an hour fast. The TV seemed to think we are on DST. I checked all the channels that I have active. Channels 2,4,6,9,12,20, and 59 were an hour fast. Channels 7 and 31 were correct.
I remember looking at the ATSC standard some years ago, and I believe that there are 2 PSIP fields that allow a tuner to determine if DST is currently active. One is a field that indicates that it is currently Daylight Savings Time. The other is a day of the month field that should be 0 if there is no pending change to DST status, but should contain the day of the month for a pending change to the DST status if the change is LESS THAN a month away. That second field allows the receiver to switch the DST status on the transition day, even if the tuner is not tuned to a station with valid PSIP information. I didn't notice the problem until today, so I suspect the second field is the issue. Colorado switches to DST on March 10, 2013. I believe the stations should begin placing a 10 in that field on February 11, 2013, but it should still be 0 on February 10, 2013. I suspect that the staions I am having trouble with placed a 10 in the field early today. I presume that many of the stations use the same PSIP generation software or services, and that would explain why so many stations have the same issue.
I presume that my TV will again report the correct time on February 11, 2013 on all the stations, because it will know that a 10 in the transition field has to be March 10, 2013.
I am just guessing what is in the PSIP fields, because of the time displayed by my TV. That is the only tool I have available to me.
Does anyone have any tools that actually report the PSIP field content?
Am I wrong in my understanding of the what the stations should be placing in the PSIP DST fields?