>>>I don't know why but everytime I install a new NT server, I always have difficulties to find where should I go to change the time from 12 hours to 24 hours.
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>>Control Panel - Regional Settings - Time. Select one of the capital H optios. The singular H will display 1 digit in the hours place before 1000 while the HH will display 01 thru 09 in those hours.
>
>Changing it from H:mm:ss to HH:mm:ss will make it from 5:30 to 05:30 instead of 17:30.

That's the lower case hh not the HH that does that. I've tested this on 3 different NT machines (combination of SP5 and SP6).