There are many "standard" binary formats for time. Some work with an offset/epoch and sometimes you have partitions as well (because of resets of the clock). This means you need extra information in order to decode it into a meaningful timestamp. It is not clear to me what format is used here. Sure you can read the bytes and interpret them as you like (un)signed int/float etc., but it's not clear how to transform this into a proper timestamp. I'm afraid more information is needed. Can you give more details on the phone station and the SW used? Why do you think the accuracy is less then a second? How did you arrive at the mapping binary -> human readable time?