Validate Date Range (From - To).

date-range-validation.js

var dv = function(date){
  var matches = /^(\d{1,2})[-\/](\d{1,2})[-\/](\d{4})$/.exec(date);
    if (matches == null) return {'isValid': false};
    var m = matches[1] - 1;
    var d = matches[2];
    var y = matches[3];
    var cd = new Date(y, m, d);
    var isValid = (cd.getDate() == d) && (cd.getMonth() == m) && (cd.getFullYear() == y);
 
    return {'isValid': isValid, 'month':m, 'day':d, 'year':y}
};
 
var range_validate = function(from_date, to_date){
    var d1 = dv(from_date);
    var d2 = dv(to_date);
 
    return d1.isValid && d2.isValid && (
        d1.year < d2.year ||
        ( d1.year == d2.year && 
            ( d1.month < d2.month || 
                (d1.month == d2.month && d1.day < d2.day)
            )
        )
    );
};
 
console.log( dv('02/26/2013') ); // valid
console.log( range_validate('02/26/2013', '03/06/2013') ); // true
console.log( range_validate('03/26/2013', '03/06/2013') ); // false
 
// unit tests
(function(){
    var M_DAYS = [31,28,31,30,31,30,31,31,30,31,30,31];
    var genRandom = function(range, start){
        var offset = start ? start : 0;
        return Math.floor((Math.random() * range) + offset); 
    };
    var year = genRandom(2015-1900, 1900);
    var leap_year = (0 == year % 400) || (0 == year % 4 && 0 != year % 100);
 
    if (leap_year) { M_DAYS[1] += 1; }
    var month = genRandom(12, 1);
    var day = genRandom(M_DAYS[month-1], 1);
    
    console.log(month + '/' + day + '/' + year);
})();