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  • Gabriel Rossetti
    #1

    time

    Hello everyone!

    I trying to work with time and I a bit confused... If I look at my
    clock, it's 16:59 (4:59pm), if I type "date" in a terminal, it says the
    same thing. I'm wanting to write a simple NTP-type server/client (it's
    not NTP at all actually, but does the same thing). The idea is that a
    client sends it it's UTC offset and it returns the current time, so the
    server side checks the time and adds the UTC offset given by the client.
    I'm a UTC/GMT +1, I tried obtaining the UTC time, it says it's 2 hours
    earlier than the current time (14:59). I tried various other methods, I
    still get the wrong time. Does anyone have an idea with what is wrong?

    Thanks,
    Gabriel
    Tags: None
    • Mike Driscoll
      #2
      Re: time

      On Oct 7, 10:05 am, Gabriel Rossetti <gabriel.rosse. ..@arimaz.com>
      wrote:
      Hello everyone!
      >
      I trying to work with time and I a bit confused... If I look at my
      clock, it's 16:59 (4:59pm), if I type "date" in a terminal, it says the
      same thing. I'm wanting to write a simple NTP-type server/client (it's
      not NTP at all actually, but does the same thing). The idea is that a
      client sends it it's UTC offset and it returns the current time, so the
      server side checks the time and adds the UTC offset given by the client.
      I'm a UTC/GMT +1, I tried obtaining the UTC time, it says it's 2 hours
      earlier than the current time (14:59). I tried various other methods, I
      still get the wrong time. Does anyone have an idea with what is wrong?
      >
      Thanks,
      Gabriel
      Take a look at the time module. It has the functions you'll need.
      Here's a proof of concept:

      <code>

      import time

      def getCurrentTime( offset):
      """
      Assumes offset is in hours and must convert
      the offset to seconds
      """
      offset = offset * 60 * 60
      now = time.time() # returns seconds since the epoch
      # gmtime creates a time_struct instance to allow formatting
      now_struct = time.gmtime(now )
      print time.strftime(" Current time: %H:%M", now_struct)
      now += offset
      now_struct = time.gmtime(now )
      print time.strftime(" Current time: %H:%M", now_struct)
      return now

      if __name__ == "__main__":
      getCurrentTime(-2)

      </code>

      See the docs for more info: http://www.python.org/doc/2.5.2/lib/module-time.html

      Mike

        Comment

        • Richard Brodie
          #3
          Re: time


          "Gabriel Rossetti" <gabriel.rosset ti@arimaz.comwr ote in message
          news:mailman.21 24.1223392354.3 487.python-list@python.org ...
          ..
          I'm a UTC/GMT +1, I tried obtaining the UTC time, it says it's 2 hours earlier than the
          current time (14:59). I tried various other methods, I still get the wrong time. Does
          anyone have an idea with what is wrong?
          It would be helpful to specify a named timezone. 2 hours earlier would be
          expected for central Europe, it being summer. Sorry if that's obvious.


            Comment

            • Mike Driscoll
              #4
              Re: time

              On Oct 7, 11:11 am, "Richard Brodie" <R.Bro...@rl.ac .ukwrote:
              "Gabriel Rossetti" <gabriel.rosse. ..@arimaz.comwr ote in message
              >
              news:mailman.21 24.1223392354.3 487.python-list@python.org ...
              .
              >
              I'm a UTC/GMT +1, I tried obtaining the UTC time, it says it's 2 hours earlier than the
              current time (14:59). I tried various other methods, I still get the wrong time. Does
              anyone have an idea with what is wrong?
              >
              It would be helpful to specify a named timezone. 2 hours earlier would be
              expected for central Europe, it being summer. Sorry if that's obvious.
              There are "tzset" and "tzname" methods to the time module. I've heard
              conflicting reports about their effectiveness, but never tried them
              myself.

              Mike

                Comment

                • Lawrence D'Oliveiro
                  #5
                  Re: time

                  In message <mailman.2124.1 223392354.3487. python-list@python.org >, Gabriel
                  Rossetti wrote:
                  If I look at my clock, it's 16:59 (4:59pm), if I type "date" in a
                  terminal, it says the same thing.
                  Try this:

                  date

                  gives local time, while

                  TZ=UTC date

                  gives UTC time.
                  I'm wanting to write a simple NTP-type server/client (it's
                  not NTP at all actually, but does the same thing). The idea is that a
                  client sends it it's UTC offset and it returns the current time, so the
                  server side checks the time and adds the UTC offset given by the client.
                  It's probably easiest if the server doesn't have to know or care what
                  timezone the client is in. This is how NTP works: timezones are considered
                  to be a machine-internal matter, and all times exchanged by the protocol
                  are in UTC. So have your protocol always work in UTC.

                    Comment

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