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 ALEVT-DATE(1)                      LINUX                      ALEVT-DATE(1)
 Teletext time                                                 Teletext time

                                    1.6.2



 NAME
      alevt-date - display/set time received via Teletext


 SYNOPSIS
      alevt-date [options]


 DESCRIPTION
      alevt-date displays the time received from a Teletext source.  It can
      be used to set the system time.  The date is not interpreted (not even
      transmitted on most channels).  So it allows only adjustment of +/-12
      hours.  The default allowed adjustment is limited to +/-2 hours (use
      -delta to change).  Without the -set option it just displays the date
      in the format of the date(1) command.


 OPTIONS
      A summary of options is included below.

      -set              Set system time from time received via Teletext.

      -delta seconds    Maximum allowed adjustment made to the system time.
                        The default is 7200 seconds (2 hours) and the
                        maximum that may be given is 12 hours.

      -format string    Format string to used to print the time.  Look at
                        strftime(3) for possible control sequences.

      -vbi device       Use the given device name (default: /dev/vbi0).

      -timeout seconds  If the time can't be detected in seconds, the
                        program is terminated with a SIGALRM.

      --help            Show summary of options.

      --version         Show version of program.

      Before starting this program, you have to set the TV channel with
      another program like xawtv of set-tv.

      Note: This program does not set the battery backed up clock of your
      computer.  clock -w will do this.


 FILES
      /dev/vbi*





                                    - 1 -     Formatted:  September 27, 2020






 ALEVT-DATE(1)                      LINUX                      ALEVT-DATE(1)
 Teletext time                                                 Teletext time

                                    1.6.2



 SEE ALSO
      alevt(1x), alevt-cap(1), strftime(3), date(1), clock(8).


 BUGS
      This program is just a toy.  The time transmitted by the TV stations
      is more than inaccurate.  Some are within a few seconds of your local
      time reference but others are more then 15 minutes off.  You've been
      warned.  (And don't assume the pkt8/30 time is better.  It's even
      worse.)

      No bug reports to <froese@gmx.de> *g*.








































                                    - 2 -     Formatted:  September 27, 2020