I have timestamp log that looks like this:

2000-11-09 12:19:08.000 2000-11-09 14:09:17.000 2000-11-09 15:23:55.000 2000-11-09 13:12:23.000

I want to get the difference between the earliest and the latest timestamp

This is what I currently have, but I suspect that it can be made MUCH more efficient

What do you think?

    use Time::Local;

    # Array read from log; contains timestamps in any order:
    my @TIMES = <LOG>;

    # Sort array to get the smallest timestamp first and the largest t
+imestamp last:
    sort(@TIMES);

    # re-arrange order to use in timelocal function:
    my ($year1,$mon1,$mday1,$hours1,$min1,$sec1) = ( $TIMES[0]       =
+~ /(\d+)-(\d+)-(\d+)\s(\d+):(\d+):(\d+).000/ );
    my ($year2,$mon2,$mday2,$hours2,$min2,$sec2) = ( $TIMES[$#TIMES] =
+~ /(\d+)-(\d+)-(\d+)\s(\d+):(\d+):(\d+).000/ );

    # get timestamp in seconds since beggining of time (in unix world)
+:
    $START_LAUNCH = timelocal($sec1,$min1,$hours1,$mday1,$mon1,$year1)
+;
    $END_LAUNCH   = timelocal($sec2,$min2,$hours2,$mday2,$mon2,$year2)
+;

    # Get difference & Round off to two decimals:
    $TimeInMinutes = sprintf("%.2f",(($END_LAUNCH - $START_LAUNCH)/60)
+); 

    return $TimeInMinutes;

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In reply to Efficiently calculate the difference between TimeStamps in LOG by Anonymous Monk

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