Re: script with date operation??
On 5/13/06, Bruno Buys <bruno.grupos@gmail.com> wrote:
I am working on a script that needs to compute days. It needs to know
how many days have gone since some given date. for example, if I run it
today, it will need to know how many days have passed since, say, Feb,
02, 2006. And add the corresponding number to a variable.
I am looking at the man page for 'date', but it doesn't seem to help
much. Also, apt-cache search won't do better.
Is there any nice tool to operate dates at the console?
thanks!
Since you're doing this in a script, it presumably doesn't need to be
done in a single line. I'd start with
date -d "Feb 2, 2006" +"%s"
to get the number of seconds since the epoch for midnight on the date
specified. Then I'd do
date +"%s"
to get the same for the current time. Subtract those, and you get the
number of seconds since Feb 2, 2006. There are 86400 seconds in a
day. Divide, throw out the remainder, and you've got the number of
days since Feb 2, 2006.
If you *must* have a one-liner:
expr \( `date +"%s"` - `date -d "Feb 2, 2006" +"%s"` \) / 86400
--
Michael A. Marsh
http://www.umiacs.umd.edu/~mmarsh
http://mamarsh.blogspot.com
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