Revert "Leap year and general date validation for isDate()"

This reverts commit 8eacd50.

Author: chriso

test/validators.js

@@ -855,26 +855,15 @@ describe('Validators', function () {
             validator: 'isDate'
           , valid: [
                 '2011-08-04'
-              , '2011-09-30'
               , '04. 08. 2011.'
               , '08/04/2011'
               , '2011.08.04'
               , '4. 8. 2011. GMT'
-              , '2. 28. 2011. GMT'
-              , '2. 29. 2008. GMT'
-              , '2. 29. 1988. GMT'
               , '2011-08-04 12:00'
-              , '2/29/24'
-              , '2-29-24'
             ]
           , invalid: [
                 'foo'
               , '2011-foo-04'
-              , '2011-09-31'
-              , '2. 29. 1987. GMT'
-              , '2. 29. 2011. GMT'
-              , '2/29/25'
-              , '2-29-25'
               , 'GMT'
             ]
         });

validator.js

@@ -450,33 +450,7 @@
     };
 
     validator.isDate = function (str) {
-        var normalizedDate = new Date((new Date(str)).toUTCString());
-        var regularDay = String(normalizedDate.getDate());
-        var utcDay = String(normalizedDate.getUTCDate());
-        var dayOrYear, dayOrYearMatches, year;
-        if (isNaN(Date.parse(normalizedDate))) {
-            return false;
-        }
-        //check for valid double digits that could be late days
-        //check for all matches since a string like '12/23' is a valid date
-        dayOrYearMatches = str.match(/[23]\d(\D|$)/g);
-        if (!dayOrYearMatches) {
-            return true;
-        }
-        dayOrYear = dayOrYearMatches.map(function(match) {
-            return match.slice(0,2);
-        }).join('/');
-        year = String(normalizedDate.getFullYear()).slice(-2);
-        //local date and UTC date can differ, but both are valid, so check agains both
-        if (dayOrYear === regularDay || dayOrYear === utcDay || dayOrYear === year) {
-            return true;
-        } else if ((dayOrYear === (regularDay + '/' + year)) || (dayOrYear === (year + '/' + regularDay))) {
-            return true;
-        } else if ((dayOrYear === (utcDay + '/' + year)) || (dayOrYear === (year + '/' + utcDay))) {
-            return true;
-        } else {
-            return false;
-        }
+        return !isNaN(Date.parse(str));
     };
 
     validator.isAfter = function (str, date) {