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==Find files older than given no. of days==

To find files older than 30 days use:
<pre>
find . -mtime +30 -daystart
</pre>

'''Careful''' To automatically delete files older than 30 days use:
<pre>
find . -mtime +30 -daystart -delete
</pre>

To find files modified within last 5-6 days use:
<pre>
find . -mtime +5 -mtime -6
</pre>

There is also atime and ctime for access times and change times respectively.  mtime used in above examples is for modification times.


==Find files between two given dates==

To find files between two given dates or timestamps use commands similar to:
<pre>
find -newerct "1 Aug 2013" ! -newerct "1 Sep 2013" -ls
find -newermt "2017-11-06 17:30:00" ! -newermt "2017-11-06 22:00:00" -ls
</pre>

Refer: https://stackoverflow.com/questions/18339307/find-files-in-created-between-a-date-range

To find files between given dates and grep for a string and print file names having that string use:
<pre>
find . -newermt "1 Oct 2016" ! -newermt "31 Oct 2016" -type f -print0 | xargs -0 grep -l impstring > imp-files.txt 2>&1 &
</pre>
Here:
* m in newermt stands for modification time.  There are other options such as -newerct for creation time or -newerat for access times, etc.
* -print0 in find prints search results terminated by null.  This is great if you want to deal with spaces, special characters, etc.
* xargs -0 takes inputs given by find -print0 appropriately.  No need to worry about escaping the special characters eg spaces for grep.  xargs will take care of that



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