Runtime
Time.timeScale = 0;
Pause time
float timePassedSinceLastFrame = Time.deltaTime;
The time in seconds it took to complete the last frame. Use with Update() and LateUpdate()
float timeSinceStartOfGame = Time.time;
The time in seconds since the start of the game
float physicsInterval = Time.fixedDeltaTime;
The interval in seconds at which physics and fixed frame rate updates are performed. Use with FixedUpdate()