Exemplary method, system, and computer program embodiments for establishing an applicable local time zone of a web browser in a computing environment are provided. In one such embodiment, a plurality of time zone offsets is queried over a predetermined period of time to obtain a listing of possible time zones. Ones of the listing of possible time zones matching a polled absolute coordinated universal time (UTC) offset are selected. A plurality of weights are assigned to the selected ones of the listing of possible time zones based on at least one of the matching polled absolute UTC offset, a matching daylight savings observance type, a matching Hyper-Text Transfer Protocol (HTTP) accept-language header and a human population size. The listing of possible time zones is sorted based on the plurality of assigned weights.