JavaScript - CheckDate(), Javascript - rextester

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JavaScript - CheckDate()

//CheckDate(input)
//V8 3.31.1

print("START");

var myVar = "9/7/2015";

if (CheckDate(myVar))
    print("true");
else
    print("false");

print("END");

function CheckDate(input)
{
    //var validformat=/^\d{2}\/\d{2}\/\d{4}$/; //Basic check for format validity
    var returnval=false;
    try 
    {
        if (typeof input === "string") 
        {
            var monthfield=input.split("/")[0];
            var dayfield=input.split("/")[1];
            var yearfield=input.split("/")[2];
        }
        else
        {
            var monthfield=input.value.split("/")[0];
            var dayfield=input.value.split("/")[1];
            var yearfield=input.value.split("/")[2];
        }
        var dayobj = new Date(yearfield, monthfield-1, dayfield);
        if ((dayobj.getMonth()+1!=monthfield)||(dayobj.getDate()!=dayfield)||(dayobj.getFullYear()!=yearfield))
            alert("Invalid Day, Month, or Year range detected. Please correct and submit again.");
        else
            returnval=true;
    }catch (err) 
    {
        print("Invalid Date Format. Please correct and submit again.");
    }
    if (returnval==false && typeof input === "object") 
        input.select();
    return returnval;
}


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