The double precision time since the last FixedUpdate started (Read Only). This is the time in seconds since the start of the game.
Fixed time is updated in regular intervals (equal to fixedDeltaTime) until the timeAsDouble property is reached. This property is the double precision version of fixedTime. This offers more precision than a float or single value, particularly over extended periods of real-world time. In almost all cases, you should use the fixedTimeAsDouble equivalent over fixedTime.