How to modify the directory date?
Solution 1:
You can use touch command with -t option. This is from man touch:
NAME touch - change file timestamps SYNOPSIS touch [OPTION]... FILE... DESCRIPTION Update the access and modification times of each FILE to the current time. [...] -t STAMP use [[CC]YY]MMDDhhmm[.ss] instead of current time
An example:
touch -t 1312031429.30 /path/to/directory
will change the date modified for directory to 2013-12-03 14:29:30.