This is the header file retrieved from

network-status-version 3
vote-status consensus
consensus-method 26
valid-after 2017-09-16 18:00:00
fresh-until 2017-09-16 19:00:00
valid-until 2017-09-16 21:00:00

I want to know what is Time zone of these timestamps Are these UTC or any other timezone?


The timezone is UTC.

Almost all network services will use UTC for any time values used in the protocol. It's the industry standard.

From dir-spec.txt:

3.4. Exchanging votes

   Authorities divide time into Intervals.  Authority administrators SHOULD
   try to all pick the same interval length, and SHOULD pick intervals that
   are commonly used divisions of time (e.g., 5 minutes, 15 minutes, 30
   minutes, 60 minutes, 90 minutes).  Voting intervals SHOULD be chosen to
   divide evenly into a 24-hour day.

   Authorities SHOULD act according to interval and delays in the
   latest consensus.  Lacking a latest consensus, they SHOULD default to a
   30-minute Interval, a 5 minute VotingDelay, and a 5 minute DistDelay.

   Authorities MUST take pains to ensure that their clocks remain accurate
   within a few seconds.  (Running NTP is usually sufficient.)

   The first voting period of each day begins at 00:00 (midnight) UTC.  If
   the last period of the day would be truncated by one-half or more, it is
   merged with the second-to-last period.

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