Time zone conversion using GNU date
There are excellent Web-based time zone converters, but it is easy to do on a UNIX system using zdump and GNU date.
These examples were performed on a Ubuntu system.
What is the current time in the system-wide timezone? (I don't have the TZ environment variable set, so I'm using the system-wide timezone)
$ date Fri Nov 9 14:06:15 CST 2007
What is the current time in Sydney, Australia?
$ TZ=Australia/Sydney date Sat Nov 10 07:07:38 EST 2007
What is the time in Sydney, Australia, when it's 9 pm CST today? (If you don't specify the current date after -d, it seems to always choose tomorrow's date)
$ TZ=Australia/Sydney date -d '11/9/2007 21:00 CST' Sat Nov 10 14:00:00 EST 2007
What is the time in Sydney, Australia, when it's 9 pm CST on 2007/11/12?
$ TZ=Australia/Sydney date -d '11/12/2007 21:00 CST' Tue Nov 13 14:00:00 EST 2007
Which time zones may I choose from?
$ $ find /usr/share/zoneinfo -type f