If you are asking about the last modifide time i.e. timestamp of a file, as it's shown in 6th field of "ls -l" cmd, then it shows the time when file was last modified.
You can change it with whatever timestamp you want, as follow:
Let's say you've created a file b.txt
Quote:
% ls -l b.txt
-rw-r--r-- 1 user user 0 Nov 3 00:12 b.txt
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Then use "touch" cmd to change its timestamp:
Quote:
% touch -mt 190112150012 b.txt
% ls -l b.txt
-rw-r--r-- 1 user user 0 Dec 15 1901 b.txt
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Syntax:
touch -mt [yyyymmddHHMM] [filename]
