Converting timezone using date command

To convert time of other timezone to local time one can use:

date -d '09:30 PDT'
     Fri Jul 19 22:00:00 IST 2013

Similarly to convert localtime to other timezone we can use:

TZ='America/Los_Angeles' date -d '09:30 IST'
     Thu Jul 18 21:00:00 PDT 2013

Note that:

Files under /usr/share/zoneinfo can be seen to learn other possible values for TZ
We need to use full name like 'Asia/Seoul' instead of KST to make it work properly as there is no file named KST under /usr/share/zoneinfo. However we can use "TZ=EST" as there is file named EST under /usr/share/zoneinfo

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