alevt-date (1) - Linux Manuals

alevt-date: display/set time received via Teletext

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*

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 [at] gmx.de> *g*.