gistfile1.txt

//Colocar  clase date-input
$(function(){
$('.date-input').attr('placeholder','AAAA-MM-DD').on('change', function(e){
    var dt=$(this).val();
    if(dt!='')
    {
            var da= dt.split('-');
            var l = da.length;
            if(l <= 3)
            {
                var date='';
                for(i=0;i<l;i++)
                {
                   if(i==0)
                   {
                       if(da[i].match(/^\d{4}$/))
                       {
                           date = da[i] + "-";
                       }
                       else date = new Date().getFullYear()  + "-";
                   }
                   if(i==1)
                   {
                      if(da[i].match(/^\d{1}|d{2}$/) && da[i]>0 && da[i]<=12)
                      {
                          var m = da[i].length==1 ? '0'+da[i] : da[i];
                          date += m + "-";
                      }
                   }
                   if(i==2)
                   {
                       if(da[i].match(/^\d{1}|d{2}$/) && da[i]>0 && da[i]<=31)
                       {
                           var d = da[i].length==1 ? '0'+da[i] : da[i];
                           date += d;
                       }
                   }
                   
                }
                if(l<3)
                {
                    date+='/'+new Date().getFullYear();
                }
                if(date.match(/^\d{4}\/\d{2}\/\d{2}$/))
                {
                    $(this).val(date);
                }
                else
                {
                    var month = dateObj.getUTCMonth();
                    var day = dateObj.getUTCDate();
                    var year = dateObj.getUTCFullYear();
                    newdate = year + "-" + month + "-" + day;
                    $(this).val(date);
                };
            }
        
    }
});
});