get
Returns the number of seconds since the UNIX epoch (1970-01-01T00:00:00Z) if this value is positive, or until the UNIX epoch if this value is negative.
For example, this value will be -1 for the instant 1969-12-31T23:59:59Z, and 1 for the instant 1970-01-01T00:00:01Z.
It must be between -62135596800 and 253402300799 inclusive (which corresponds to 0001-01-01T00:00:00Z to 9999-12-31T23:59:59Z).