var today = new Date(); //to get current day's date
        //console.log(today);
        var s_today = today.toISOString().split('T')[0];//gives YYYY-MM-DD form
        //console.log(s_today);
        //calculating the last week date 1 week ago
        var last_week = new Date(Date.now() - 7*24*60*60*1000);
        //console.log(last_week);
        s_last_week = last_week.toISOString().split('T')[0];
        //console.log(s_last_week);
        //calculating previous week's date 2 weeks ago
        var previous_week = new Date(last_week - 7*24*60*60*1000);
        //console.log(previous_week);
        s_previous_week = previous_week.toISOString().split('T')[0];
        //console.log(s_previous_week);