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compare dates in shell script

Posted on 2009-02-13
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Last Modified: 2012-05-06
I need to compare 2 dates (date now and one from a file) and if date now is 20 minutes more than the date in the file, the script needs to restart the browser.

cat lastplaylist    gives me the date in the file:Fri Feb 13 05:48:51 GMT 2009
date gives me date and time now: Fri Feb 13 08:48:51 GMT 2009

I know I can restart the browser by
killall firefox
firefox http://mywebsite.com

I just don't know how to compare the 2 dates and see the difference in minutes.

Could someone help?

Many thanks
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Question by:zeraxis_ee
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Accepted Solution

by:
Maciej S earned 2000 total points
ID: 23631058
1200 is 20 minutes in seconds.
#!/bin/sh
 
DATE_NOW=`date +%s`
DATE_FROM_FILE=`date -d "\`cat lastplaylist\`" +%s`
 
DATE_DIFF=$(( DATE_NOW - DATE_FROM_FILE ))
 
if [ ${DATE_DIFF} -gt 1200 ]; then
   killall firefox
   firefox http://mywebsite.com/
fi

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Author Comment

by:zeraxis_ee
ID: 23632668
That works perfectly... thank you
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