Unix Tip #4460- May 27, 2016


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SOLARIS CHANGING SEASONS


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.

export TZ=ESThhEDT

The EST set your time to Eastern
Standard Time and EDT is Eastern
Daylight Time.

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.

export TZ=EST29EDT

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.


NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted by various unix admins around the globe. UGU suggest you read and test each tip in a non-volitile environment before placing into production.


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