/// Timestamp representing seconds in UTC since the UNIX epoch (January 1, 1970).
pubtypeUtcTimestamp=u64;/// Trait for getting the current timestamp in UTC seconds since UNIX epoch.
////// This abstraction allows for both real system time and mock time in tests.
pubtraitUtcTimestampProvider: Send + Sync + std::fmt::Debug {/// Returns the current UTC timestamp as seconds since UNIX epoch.
fnunix_timestamp(&self)-> UtcTimestamp;}