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It's the file's age in seconds.

Option 1: see if you have the stat command, as it can do something similar.
Option 2: write a simple Perl or awk script.
Option 3: install GNU date on AIX

Here's a quick and dirty Perl script.
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There are different versions of the date command. If you are on Sun or HP-UX, see if you can find an XPG4 version. Or you could see if you have the stat command available.

The integer is the number of seconds since January 1st, 1970. It's also called the Unix epoch. You can print it e.g. with the command date +%s