why do i get 0

//var systime:int=10;
var health:float=100;
function Update () {
    if (Input.GetKey ("up"))
         //systime =System.DateTime.Now.Hour;
		 {
		 var systime:int =PlayerPrefs.GetInt("systime");
		 PlayerPrefs.SetInt("systime", System.DateTime.Now.Hour);}
    if (Input.GetKey ("down")){
        print (systime);
		}
}