I am working on the zigbee portion of wireshark. Wireshark uses traditional gmtime function, which has epoch year 1970. But Zigbee has its own epoch year 2000 Jan 1st. Hence, when a NTP time 0x00000000 is passed on to wireshark, I expect it to be 2000. Jan .1st. But, when I use tvb_ntp_ts function, it gives me errors. How can I resolve this issue? asked 27 Jul '13, 21:02  xjybentusi edited 27 Jul '13, 23:55  Guy Harris ♦♦ |
One Answer:
NTP times use neither the UN*X epoch of January 1, 1970, 00:00:00 UTC nor the Zigbee epoch of January 1, 2000 (presumably also 00:00:00 UTC). It, instead, uses an epoch of January 1, 1900, 00:00:00 "UTC", so you can't use any NTP time stamp functions to deal with UN*X times or Zigbee times. You would have to convert Zigbee times to UN*X/POSIX times; if you have a count of seconds since January 1, 2000, 00:00:00 UTC, you would have to add to it the number of seconds between January 1, 1970, 00:00:00 UTC and January 1, 2000, 00:00:00 UTC, and you could then use that, plus an optional count of nanoseconds, as a UN*X-style time stamp. (Calculating that number of seconds is left as an exercise to the reader.) answered 27 Jul '13, 23:54 Guy Harris ♦♦ |
