The  $_ in  localtime $_ is not optional: without it, the function returns current local time; likewise gmtime().

The  -l (that's a small ell) command line switch may be useful: it will automatically  chomp the input record separator (IRS) on input and append the ORS on output. (IRS and ORS are both a newline by default.) As mentioned, not so important on input, but on output this gives you your converted time strings each on a separate line rather than as one (very long) line. 

>cat utimes
1111111
22222222
333333333

>perl -wMstrict -lne "print scalar localtime $_"  < utimes  > ltimes

>perl -wMstrict -lne "print scalar gmtime $_"  < utimes  > gmtimes

>cat ltimes
Tue Jan 13 15:38:31 1970
Mon Sep 14 23:50:22 1970
Thu Jul 24 19:35:33 1980

>cat gmtimes
Tue Jan 13 20:38:31 1970
Tue Sep 15 04:50:22 1970
Fri Jul 25 00:35:33 1980

[download]
Example without  -l command line switch: 
>perl -wMstrict -ne "print scalar localtime $_"  < utimes  > ltimes

>cat ltimes
Tue Jan 13 15:38:31 1970Mon Sep 14 23:50:22 1970Thu Jul 24 19:35:33 19
+80

[download]

In reply to Re^6: changing date format in and out by AnomalousMonk
in thread changing date format in and out by gio001

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