Since you indicated you are a "newbie" and did not indicate what operating system you were on let me expand on what steves has offered:

use POSIX qw(strftime);
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This line exports ONLY the string format time function from the POSIX core module.

If you do not recognize the "template" that steves used, they come from the posix date command.

You may want to ask the oracle for answers on man date.

This will explain what each formatting directive does.

For example:

%a   Abbreviated weekday name.  For example, Wed.
%A   Full weekday name.  For example, Wednesday.
%b   Abbreviated month name.  For example, Jan.
%B   Full month name.  For example, January.
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Hope this helps - cheers - L~R