($time,$date) = split(/ /,$tmp[0]);
This is actually coming from the raw data file before any manipulation which looks like this:

10:40:32 08/08/2003     good    website     servername       8.32 sec,
+ 9 steps, 241K total, 35 images        
16:72472        200     8328    ok      1557    662     1275    582   
+  517     1129    1053    962     
591
[download]

I convert the time/date to the new format for use with Ploticus (an opensource graphing tool which I love) which likes to see a period between the two.

Edit by tye, change PRE to CODE around long lines