[creatornator]

I think that has more to do with timeouts than the OTP generation itself. Like the RSA tokens which allow use of the passcodes slightly before or after the active time range (and can use discrepancies to re-sync the clock) but will not accept an older passcode or one not generated yet. I doubt there's much of an incentive for them to handle clocks that far off, or anything more than normal locale issues for that matter.