Managing Batch Jobs for Several Time Zones?

sporty asks: "I have one machine, a unix box, that serves many time zones at once. Because of this, everything is stored in GMT. Even the system clock is set relative to GMT. The problem is determining when midnite is. I need to run certain jobs, via cron or similar, so that something runs at midnite in that timezone. Anyone have this situation before?"

Comments

Please, geeks of the world

[Anonymous Cowdog]

Don't know if this advice applies to this guy or not, because he might truly have a need to run at exactly midnight. But please, run your cron jobs at randomly chosen times, instead of exactly on the hour. That way we can spread the load (machine and network) better. Thank you, have a nice day.

TZ is your friend

[sysadmn]

Fun Facts:

• The TZ environment variable is used to determine how to interpret times.
• Most shells allow you to set environment variables for a single command by specifying them on the command line

i.e.

$ TZ=EST5EDT at 12 am
...
$ TZ=PST8PDT at 12 am
...
$ at -l
1058932800.a Wed Jul 23 00:00:00 2003
1058943600.a Wed Jul 23 03:00:00 2003

DateTime.pm is your friend

[Space_Nerd]

Check it out, it converts between timezones automagically, respects daylight savings, and all of the fun stuff.

It's really a lifesaver, here is a link DateTime.pm