Date Javascipt validation

by chinmaysharma01

HTML

<input type="button" onclick="firstDayOfWeek()" value="Click Me!"/>
<script type="text/javascript">
function firstDayOfWeek() {
var DAY = 24 * 60 * 60 * 1000;
				const ds = new Date();
        //var ds = new Date(2019, 3, 13, 10, 33, 30, 0);
        console.log(ds);
        console.log(ds.getDay());
        //var day;
        if(ds.getDay()===0)
        {
        	ds.setDate(ds.getDate()-1);
        }
        
        var day = ds.getDay();
        console.log(day);
        var d = new Date(ds.getTime() - (day * DAY));
        console.log(d);
        d.setHours(0, 0, 0, 0);
        d.setDate(d.getDate()+1);
        console.log(d);
        
    }
</script>