Systems and methods for validating and adjusting local transaction times are provided. A host computing system includes a processor and a memory in communication with the processor. The host computing system receives a computer message comprising authorization data associated with a transaction, the authorization data including a location identifier and a local transaction time set by a remote computing device used in processing the transaction. The host computing system also appends a header including a header processor time to the computer message, determines a time zone associated with the local transaction time based on the location identifier, converts the header processor time to a local header processor time based on the time zone, and determines that the local transaction time is validated based on the local header processor time.