in angstrom set time zone to IST

In /usr/share/zoneinfo there is no file regarding Indian Standard Time. How can set my time zone to IST?? Or else how to set time zone to UTC+5:30.

I think this was covered in another post…
https://groups.google.com/forum/#!searchin/beagleboard/atlnatic/beagleboard/xp_OXltR1KM/DYI2xSw4jgMJ

try …
opkg update
opkg install tzdata-asia