Date change related query Post: 27583

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Top Forums UNIX for Dummies Questions & Answers Date change related query Post 27583 by auswipe on Wednesday 4th of September 2002 12:28:23 AM

09-04-2002

Registered User

Re: Date change related query

Quote:

Originally posted by franklo
Meaning...I need a simple unix script that I can run as crone that takes as variable the url of another server and makes my server's time that of the other server plus 2 seconds. So if it is there 9:00 pm, my server's time becomes 21:00:02

Hmmm. At first I thought this was going to be a humdinger. This is how I solved the problem of having offset time by +2 seconds:

Code:

set -- `date -v +2S`
date ` echo $4 | sed -e 's/:/ /g' | awk '{printf("%s%s.%s\n", $1, $2, $3);}'`

Give it a try, your mileage may vary. I checked this out on a FreeBSD 4.5 system. This should be in your cronjob shell script right after sync'ing the time of the box. You will probably lose several tenths of a second. I don't know how accurate you have to have your clock sync'd to the server and this might be of some consideration.

Another important note is to not execute the cronjob near midnight. If for some reason the time sync'd at 23:59:59 the above shell script would be bad as the actual date wouldn't change, but the time would be 00:00:01 of the same day, effectively setting the time back almost 24 hours.

Last edited by auswipe; 09-04-2002 at 01:34 AM..

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LEARN ABOUT SUSE

alevt-date

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

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*

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*.

LINUX
								       1.6.2							     ALEVT-DATE(1)

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