Hi Dave, Here is a bit more code: 
$earliest0 = `more $ARGV[0]| grep -v Epoch > newfile.txt| head -1 newf
+ile.txt`;
@Array0 = split(' ',$earliest0);
$date0 = "@Array0[0] @Array0[1]";
$earliest1 = `more $ARGV[1]| grep -v Epoch > newfile1.txt| head -1 new
+file1.txt`;
@Array1 = split(' ',$earliest1);
$date1 = "@Array1[0] @Array1[1]";

if($date0 eq $date1){$early = $ARGV[0]; $late = $ARGV[1];}
if($date0 lt $date1){$early = $ARGV[0]; $late = $ARGV[1];
    $File = "newfile.txt"; open(File);
    $i = 0;
    while(<File>){
        @check = split(' ',$_);
        $date = "@check[0] @check[1]";
        if($date eq $date1){last;} $i++;
    }
}
if($date1 lt $date0){$early = $ARGV[1]; $late = $ARGV[0];
    $File = "newfile1.txt"; open(File);
    $i = 0;
    while(<File>){
        @check = split(' ',$_);
        $date = "@check[0] @check[1]";
        if($date eq $date0){last;} $i = $i++;
    }
}

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The  while statements are needed to determine which line number matches the latest date. I tried using regular expressions to do this but could not figure it out. When I execute this script it sometimes returns the correct $i, sometimes executes the wrong $if statement. Thanks!

In reply to Re^2: Time matching YYYY-MM-DD HH:MM:SS.SSS by PRyanRay
in thread Time matching YYYY-MM-DD HH:MM:SS.SSS by PRyanRay

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