Merchant API v1beta was discontinued and shut down on February 28, 2026. For steps to transition to the latest stable version, see Migrate from v1beta to v1.
Represents a time interval, encoded as a Timestamp start (inclusive) and a Timestamp end (exclusive).
The start must be less than or equal to the end. When the start equals the end, the interval is empty (matches no time). When both start and end are unspecified, the interval matches any time.