I suspect it uses something with the city you enter when you set up
your operating system. I think there's a way to set preferences, but
for some reason access to this didn't get put into VoiceOver … um …
0.7. Yet another in a list of reasons that I hope they release
version 1.0* of VoiceOver with or before the release of Mac OS
10.5**, or I will cry.***
* Yes, I'm fully cognizent that they're calling this version 1.0.
I'm sorta reluctant to though.
** This message has been captioned for the humor impaired.
*** OK, I probably won't cry, but I'll be really, really sad.