Okay, there are four bytes for timezone info, in the flash savearea at offsets 0x51 0x52 0x53 0x54. These hold subdirectory indexes (alphabetic order assumed) for the timezone info under /usr/share/zoneinfo/

I have mine set to Canada -> Eastern, so the flash savearea shows 1C-04-00-00, which means "the 28th entry" (Canada), and then "the 4th entry" (Eastern). No more subentries for me, but in other parts of the world there may be.

Cheers