Fix date methods

Author: Xotic750

es5-shim.js

@@ -1076,6 +1076,202 @@ defineProperties($Object, {
 // ====
 //
 
+var hasNegativeMonthYearBug = new Date(-3509827329600292).getUTCMonth() !== 0;
+var aNegativeTestDate = new Date(-1509842289600292);
+var aPositiveTestDate = new Date(1449662400000);
+var hasToUTCStringFormatBug = aNegativeTestDate.toUTCString() !== 'Mon, 01 Jan -45875 11:59:59 GMT';
+var hasToDateStringFormatBug;
+var hasToStringFormatBug;
+var timeZoneOffset = aNegativeTestDate.getTimezoneOffset();
+if (timeZoneOffset < -720) {
+    hasToDateStringFormatBug = aNegativeTestDate.toDateString() !== 'Tue Jan 02 -45875';
+    hasToStringFormatBug = !(/^Thu Dec 10 2015 \d\d:\d\d:\d\d GMT[-\+]\d\d\d\d(?: |$)/).test(aPositiveTestDate.toString());
+} else {
+    hasToDateStringFormatBug = aNegativeTestDate.toDateString() !== 'Mon Jan 01 -45875';
+    hasToStringFormatBug = !(/^Wed Dec 09 2015 \d\d:\d\d:\d\d GMT[-\+]\d\d\d\d(?: |$)/).test(aPositiveTestDate.toString());
+}
+
+var originalGetFullYear;
+var originalGetMonth;
+var originalGetDate;
+var originalGetUTCFullYear;
+var originalGetUTCMonth;
+var originalGetUTCDate;
+var originalToUTCString;
+var originalToDateString;
+var originalToString;
+var dayName;
+var monthName;
+var daysInMonth;
+if (hasNegativeMonthYearBug || hasToDateStringFormatBug || hasToUTCStringFormatBug || hasToStringFormatBug) {
+    originalGetFullYear = Date.prototype.getFullYear;
+    originalGetMonth = Date.prototype.getMonth;
+    originalGetDate = Date.prototype.getDate;
+    originalGetUTCFullYear = Date.prototype.getUTCFullYear;
+    originalGetUTCMonth = Date.prototype.getUTCMonth;
+    originalGetUTCDate = Date.prototype.getUTCDate;
+    originalToUTCString = Date.prototype.toUTCString;
+    originalToDateString = Date.prototype.toDateString;
+    originalToString = Date.prototype.toString;
+    dayName = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri'];
+    monthName = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
+    daysInMonth = function dim(month, year) {
+       return originalGetDate.call(new Date(year, month, 0));
+    };
+}
+
+defineProperties(Date.prototype, {
+    getFullYear: function getFullYear() {
+        if (!this || !(this instanceof Date)) {
+            throw new TypeError('this is not a Date object.');
+        }
+        var year = originalGetFullYear.call(this);
+        if (year < 0 && originalGetMonth.call(this) > 11) {
+            return year + 1;
+        }
+        return year;
+    },
+    getMonth: function getMonth() {
+        if (!this || !(this instanceof Date)) {
+            throw new TypeError('this is not a Date object.');
+        }
+        var year = originalGetFullYear.call(this);
+        var month = originalGetMonth.call(this);
+        if (year < 0 && month > 11) {
+            return 0;
+        }
+        return month;
+    },
+    getDate: function getDate() {
+        if (!this || !(this instanceof Date)) {
+            throw new TypeError('this is not a Date object.');
+        }
+        var year = originalGetFullYear.call(this);
+        var month = originalGetMonth.call(this);
+        var date = originalGetDate.call(this);
+        if (year < 0 && month > 11) {
+            if (month === 12) {
+                return date;
+            }
+            var days = daysInMonth(0, year + 1);
+            return (days - date) + 1;
+        }
+        return date;
+    },
+    getUTCFullYear: function getUTCFullYear() {
+        if (!this || !(this instanceof Date)) {
+            throw new TypeError('this is not a Date object.');
+        }
+        var year = originalGetUTCFullYear.call(this);
+        if (year < 0 && originalGetUTCMonth.call(this) > 11) {
+            return year + 1;
+        }
+        return year;
+    },
+    getUTCMonth: function getUTCMonth() {
+        if (!this || !(this instanceof Date)) {
+            throw new TypeError('this is not a Date object.');
+        }
+        var year = originalGetUTCFullYear.call(this);
+        var month = originalGetUTCMonth.call(this);
+        if (year < 0 && month > 11) {
+            return 0;
+        }
+        return month;
+    },
+    getUTCDate: function getUTCDate() {
+        if (!this || !(this instanceof Date)) {
+            throw new TypeError('this is not a Date object.');
+        }
+        var year = originalGetUTCFullYear.call(this);
+        var month = originalGetUTCMonth.call(this);
+        var date = originalGetUTCDate.call(this);
+        if (year < 0 && month > 11) {
+            if (month === 12) {
+                return date;
+            }
+            var days = daysInMonth(0, year + 1);
+            return (days - date) + 1;
+        }
+        return date;
+    }
+}, hasNegativeMonthYearBug);
+
+defineProperties(Date.prototype, {
+    toUTCString: function toUTCString() {
+        if (!this || !(this instanceof Date)) {
+            throw new TypeError('this is not a Date object.');
+        }
+        var day = this.getUTCDay();
+        var date = this.getUTCDate();
+        var month = this.getUTCMonth();
+        var year = this.getUTCFullYear();
+        var hour = this.getUTCHours();
+        var minute = this.getUTCMinutes();
+        var second = this.getUTCSeconds();
+        return dayName[day] + ', ' +
+            (date < 10 ? '0' + date : date) + ' ' +
+            monthName[month] + ' ' +
+            year + ' ' +
+            (hour < 10 ? '0' + hour : hour) + ':' +
+            (minute < 10 ? '0' + minute : minute) + ':' +
+            (second < 10 ? '0' + second : second) + ' GMT';
+    }
+}, hasNegativeMonthYearBug || hasToUTCStringFormatBug);
+
+// Opera 12 has `,`
+defineProperties(Date.prototype, {
+    toDateString: function toDateString() {
+        if (!this || !(this instanceof Date)) {
+            throw new TypeError('this is not a Date object.');
+        }
+        var day = this.getDay();
+        var date = this.getDate();
+        var month = this.getMonth();
+        var year = this.getFullYear();
+        return dayName[day] + ' ' +
+            monthName[month] + ' ' +
+            (date < 10 ? '0' + date : date) + ' ' +
+            year;
+    }
+}, hasNegativeMonthYearBug || hasToDateStringFormatBug);
+
+// can't use defineProperties here because of toString enumeration issue in IE <= 8
+if (hasNegativeMonthYearBug || hasToStringFormatBug) {
+    Date.prototype.toString = function toString() {
+        if (!this || !(this instanceof Date)) {
+            throw new TypeError('this is not a Date object.');
+        }
+        var day = this.getDay();
+        var date = this.getDate();
+        var month = this.getMonth();
+        var year = this.getFullYear();
+        var hour = this.getHours();
+        var minute = this.getMinutes();
+        var second = this.getSeconds();
+        var timezoneOffset = this.getTimezoneOffset();
+        var hoursOffset = Math.floor(Math.abs(timezoneOffset) / 60);
+        var minutesOffset = Math.floor(Math.abs(timezoneOffset) % 60);
+        return dayName[day] + ' ' +
+            monthName[month] + ' ' +
+            (date < 10 ? '0' + date : date) + ' ' +
+            year + ' ' +
+            (hour < 10 ? '0' + hour : hour) + ':' +
+            (minute < 10 ? '0' + minute : minute) + ':' +
+            (second < 10 ? '0' + second : second) + ' GMT' +
+            (timezoneOffset > 0 ? '-' : '+') +
+            (hoursOffset < 10 ? '0' + hoursOffset : hoursOffset) +
+            (minutesOffset < 10 ? '0' + minutesOffset : minutesOffset);
+    };
+    if (supportsDescriptors) {
+        $Object.defineProperty(Date.prototype, 'toString', {
+            configurable: true,
+            enumerable: false,
+            writable: true
+        });
+    }
+}
+
 // ES5 15.9.5.43
 // http://es5.github.com/#x15.9.5.43
 // This function returns a String value represent the instance in time