During a session, sometimes we have a need to change the system time for our session
only. We have used it to simulate time based testing.
The EST set your time to Eastern
Standard Time and EDT is Eastern
hh is the number of hours you wish to change.
Example: Currently the system
date is Tue Jun 19 13:38:03 EDT 2001
and you wish to set it to yesterday at the same time. You would substitute a positive
29 for hh.
Now the shell time is:
Mon Jun 18 13:38:50 EDT 2001
WHY 29 and not 24? The main UNIX clock is set from GMT not EST therefore you have to add 5 hours to your backward calculations to get the same exact time since EST is
GMT - 5 hours.
Use negitive numbers to set the clock into the future.
Also if you need to set the minutes and seconds it is hh:mm:ss. These are all the
number of hours, minutes and seconds from GMT that you wish to set.
This is for Solaris 2.6, your mileage may vary.