Time zone conversion using GNU date

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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
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