Reseting timer when timer is on 0: 00 in Android

Hey everybody, I have a function called "countDown" which simply creates a timer counting down, on button press Id like the timer to start (the timer lasts for 60 seconds) and then after 61 seconds I would like it to reset by itself.

CODE:

var win = Ti.UI.createWindow({
    backgroundImage:'background.png.jpg',
    exitOnClose:true, 
});
win.open();
 
var buttonWolf1 = Ti.UI.createButton({ 
    backgroundImage:'120px-WolfSquare.png',
    id:"Wolf1",
    width:100,
    height:100,
    top:30,
    left:140,
});
 
var displayWolf1 =  Titanium.UI.createLabel({
    text:"1 : 00",
    height:40,
    width:160,
    top:50,
    left:0,
    color:'#fff',
    font:{
        fontSize:35,
        fontWeight:'bold'
    },
    textAlign:'center'
});
 
 
win.add(buttonWolf1);
 
buttonWolf1.addEventListener('click',function(){
    my_timer4.start(); // Start the timer 
    win.add(displayWolf1); // Add the label next to the timer
    setTimeout (resettimer1(), 61000 ); // After 61 seconds reset timer...? NOT WORKING
});
 
var resettimer1 = function() {
    my_timer4.stop // Stop the timer
    my_timer4.set // Reset the timer    
}
 
// Global countdown function
var countDown =  function( m , s, fn_tick, fn_end  ) {
    return {
        total_sec:m*60+s,
        timer:this.timer,
        set: function(m,s) {
            this.total_sec = parseInt(m)*60+parseInt(s);
            this.time = {m:m,s:s};
            return this;
        },
        start: function() {
            var self = this;
            this.timer = setInterval( function() {
                if (self.total_sec) {
                    self.total_sec--;
                    self.time = { m : parseInt(self.total_sec/60), s: (self.total_sec%60) };
                    fn_tick();
                }
                else {
                    self.stop();
                    fn_end();
                }
                }, 1000 );
            return this;
        },
        stop: function() {
            clearInterval(this.timer);
            this.time = {m:0,s:0};
            this.total_sec = 0;
            return this;
        }
    };
};  
 
// Timer for Wolf1
var my_timer4 = new countDown(1,00, 
        function() {
            displayWolf1.text = my_timer4.time.m+" : "+my_timer4.time.s;
        },
        function() {
            sound.play();
        });

At the moment the application crashes using android device. I appreciate any help a lot! I have tried:

while(true) {
    if (displayWolf1.text > 0 : 1 || displayWolf1.text == 0 : 0) {
        mytimer_4.set
 
}

buttonWolf1.addEventListener('click',function(){
    my_timer4.start(); // Start the timer 
    win.add(displayWolf1); // Add the label next to the timer
    setTimeout (my_timer4.set, 61000 ); // After 61 seconds reset timer...? NOT WORKING EITHER
});