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

6       alevt-date - display/set time received via Teletext
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SYNOPSIS

10       alevt-date [options]
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DESCRIPTION

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

23       A summary of options is included below.
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25       -set              Set system time from time received via Teletext.
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27       -delta seconds    Maximum allowed adjustment made to the system time.
28                         The default is 7200 seconds (2 hours) and the maximum
29                         that may be given is 12 hours.
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31       -format string    Format string to used to print the time.  Look at
32                         strftime(3) for possible control sequences.
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34       -vbi device       Use the given device name (default: /dev/vbi0).
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36       -timeout seconds  If the time can't be detected in seconds, the program
37                         is terminated with a SIGALRM.
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39       --help            Show summary of options.
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41       --version         Show version of program.
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43       Before starting this program, you have to set the TV channel with
44       another program like xawtv of set-tv.
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46       Note: This program does not set the battery backed up clock of your
47       computer.  clock -w will do this.
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FILES

51       /dev/vbi*
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SEE ALSO

55       alevt(1x), alevt-cap(1), strftime(3), date(1), clock(8).
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BUGS

59       This program is just a toy.  The time transmitted by the TV stations is
60       more than inaccurate.  Some are within a few seconds of your local time
61       reference but others are more then 15 minutes off.  You've been warned.
62       (And don't assume the pkt8/30 time is better.  It's even worse.)
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64       No bug reports to <froese@gmx.de> *g*.
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68LINUX                                1.6.2                       ALEVT-DATE(1)
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