unix, no. 01 1970 .
DateTime dt = new DateTime(1970, 1, 1, 0, 0, 0, 0).AddSeconds(1268927156);
If both timestamps utc and local are the same, the timezone on your PBX is either set to UTC, or your timestamps are really UTC, or the timezone is set to UTC, but the time is set to your local time and you get your local time for both timestamps. You will need to find out which one, so you will know how to convert timestamps from UTC or not.
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