In windows, you can edit the default time settings by double clicking on the digital clock and set the time you want and click apply, and changes will reflect immediately.
However, there are times when you do not want anyone to change the settings of time or say you want to lock the ‘clock’, this is when you can make use of ‘Clock guards’, which help you achieve this.
Some of the common reasons you’d use a clock guard are :
1) Preventing files from being given falsified time/date stamps by manually resetting the system clock and then saving the file.
2) Prevent employees who are using a computer-based time clock from altering the time to allow themselves to “punch in” at a falsified time.
3) Prevent users who have time limited programs (programs that can only be used at certain times) from accessing these programs at improper times.
4) Prevent people who are paying for computer use on a time basis from resetting the clock to reduce the amount of time they pay for.
5) Prevent people who are restricted to a certain amount of computer time per day (usually children) from resetting the computer clock to give themselves more time.
I was looking for a Clock guard for a reason and found clock guard 8.4.0, which is a very effective, free Clock Guard software.
It works on almost all windows OS – 95/98/2000/ME/XP/NT/Vista. Using this you can prevent admin / users of the system from tampering the computer clock settings.