I live in brasil and i cant put the right (gmt)

[jvtc10]

in brasil the gmt is -3, but the maximun i could find was -3,-30 on my n900
any idea to help me?
thank you

[jaguilar]

in brasil the gmt is -3, but the maximun i could find was -3,-30 on my n900
any idea to help me?
thank you

Tap the clock in the desktop, tap "clock & alarms", tap the hour that appear in the upper of the screen (not in the "world clocks" in the bottom right), tap "timezone" and search for your city.

Or, for a more simple solution, set the device to update automatically.