Congratulations to Cicadaman & co. for getting Froyo running on the Nook Color! Visit the nook Color portal!
See Rooting new hardware FIRST if you have a nook original with a 1003* serial# or above.
NookColor Set TimeZone
From nookDevs
Part of the NookColor portal
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Set TimeZone (GUI)
The NookColor allows you to change the timezone through Settings->Time->Select time zone Enable the checkbox called "Show all world time zones" at the bottom of page to show all time zones.