For example I read a file listed with dates:

in.txt:
Mon Mar 30 10:00:00 2013
Sun Mar 29 10:00:00 2013
Sat Mar 28 10:00:00 2013

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and I want to subtract 30 days from each date and save them to out.txt in exactly this same format Of course I can read the file and tokenize them, but I don't know how to subtract date(and with same format).. what is the proper module for this job?

In reply to Perl date calculation and formatting by Anonymous Monk

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