DaysInmonth JavaScript
var dt = new Date();
var month = dt.getMonth();
var year = dt.getFullYear();
daysInMonth = new Date(year, month, 0).getDate();
Snippets
var dt = new Date();
var month = dt.getMonth();
var year = dt.getFullYear();
daysInMonth = new Date(year, month, 0).getDate(); <script type="text/javascript">
var dt = new Date();
var month = dt.getMonth();
var year = dt.getFullYear();
daysInMonth = new Date(year, month, 0).getDate();
</script>