How to validate the DateTime of MM/dd/yyyy hh:mm format?

Question

I am using MaskedEditExtender for entering a datetime. I am unable to figure out how to validate it.

Is there any Regular Expression for validating dates along with

Answer 1

You may try following Function that Validates date in "dd/MM/yyyy HH:mm" format

    function ValidateDate(dt) {
        try {
            var isValidDate = false;
            var arr1 = dt.split('/');
            var year=0;var month=0;var day=0;var hour=0;var minute=0;var sec=0;
            if(arr1.length == 3)
            {
                var arr2 = arr1[2].split(' ');
                if(arr2.length == 2)
                {
                    var arr3 = arr2[1].split(':');
                    try{
                        year = parseInt(arr2[0],10);
                        month = parseInt(arr1[1],10);
                        day = parseInt(arr1[0],10);
                        hour = parseInt(arr3[0],10);
                        minute = parseInt(arr3[1],10);
                        //sec = parseInt(arr3[0],10);
                        sec = 0;
                        var isValidTime=false;
                        if(hour >=0 && hour <=23 && minute >=0 && minute<=59 && sec >=0 && sec<=59)
                            isValidTime=true;
                        else if(hour ==24 && minute ==0 && sec==0)
                            isValidTime=true;

                        if(isValidTime)
                        {
                            var isLeapYear = false;
                            if(year % 4 == 0)
                                 isLeapYear = true;

                            if((month==4 || month==6|| month==9|| month==11) && (day>=0 && day <= 30))
                                    isValidDate=true;
                            else if((month!=2) && (day>=0 && day <= 31))
                                    isValidDate=true;

                            if(!isValidDate){
                                if(isLeapYear)
                                {
                                    if(month==2 && (day>=0 && day <= 29))
                                        isValidDate=true;
                                }
                                else
                                {
                                    if(month==2 && (day>=0 && day <= 28))
                                        isValidDate=true;
                                }
                            }
                        }
                    }
                    catch(er){isValidDate = false;}
                }

            }

            return isValidDate;
        }
        catch (err) { alert('ValidateDate: ' + err); }
    }

Answer 2

Use DateTime.Parse or DateTime.TryParse (there are also ParseExact and TryParseExact equivalents).

If the string does not represent a valid DateTime it will not parse.

DateTime myDateTime = DateTime.ParseExact(myString, 
                                          "MM/dd/yyyy hh:mm", 
                                          CultureInfo.InvariantCulture);

The above will throw an exception if the value is not parseable. Use the Try variant if you want to avoid the chance of the exception being thrown - this requires an out parameter and testing the return value of the function for success.

Answer 3

And just in case you want the regular expression, this should work:

^(0[1-9]|1[012])/(0[1-9]|[12][0-9]|3[01])/(19|20)\d\d ([01]\d|2[0-3]):[0-5]\d$

Answer 4

Javascript has Date.parse

it takes US formatted date of mm/dd/yyyy hh:mm:ss

alert(new Date(Date.parse("09/10/2011 12:00")))

will return 10th September 2011 at noon

Answer 5

THis will solve your issue:

^(([0]?[1-9]|1[0-2])/([0-2]?[0-9]|3[0-1])/[1-2]\d{3}) (20|21|22|23|[0-1]?\d{1}):([0-5]?\d{1})$