There really is no equivalent to Time.deltaTime that gives an int…nor would you really want to anyway; time increases between frames is never on the scale of seconds.
If all you want is to track how long someone’s been in game you can always use Time.time. Or you could use something like
You can’t have score be an int, because Time.deltaTime is a float. Score must be a float. So either make another variable that’s an int—maybe call it realScore—and cast score to the realScore variable, or just display score as an int using ToString formatting or another technique.