convert date into date time string code example
Example 1: js string to date
var myDate = new Date("2013/1/16");
var str = "2013/1/16";
var strToDate = new Date(str);
Example 2: convert string date to datetime and format
var dateString = "2020-09-25T10:13:21.246321+01:00";
String formattedDateString = DateFormat('do LLLL yyyy').format(DateTime.parse(dateString));
Example 3: how to validate from and to date using date.parse in javascript
var stringval = '01/03/2012';
var testdate;
try {
testdate = $.datepicker.parseDate('mm/dd/yy', stringval);
} catch (e)
{
alert(stringval + ' is not valid. Format must be MM/DD/YYYY ' +
'and the date value must be valid for the calendar.';
}