AT&T California in Redwood City, CA
These numbers are located in the city of Redwood City part of San Mateo county. There are a few other subcodes that cover this area as well so take care not to confuse them.
San Mateo county is situated in California and operates PT (UTC -08:00) time. This number group covers the 94062, 94064, 94065, & 94063 zip codes.