src/date/is-leap-year.js

@@ -0,0 +1,14 @@
+define(function() {
+
+/**
+ * isLeapYear( year )
+ *
+ * @year [Number]
+ *
+ * Returns an indication whether the specified year is a leap year.
+ */
+return function( year ) {
+	return new Date(year, 1, 29).getMonth() === 1;
+};
+
+});

src/date/last-day-of-month.js

@@ -0,0 +1,14 @@
+define(function() {
+
+/**
+ * lastDayOfMonth( date )
+ *
+ * @date [Date]
+ *
+ * Return the last day of the given date's month
+ */
+return function( date ) {
+	return new Date( date.getFullYear(), date.getMonth() + 1, 0).getDate();
+};
+
+});

src/date/parse.js

@@ -1,12 +1,13 @@
 define([
+	"./is-leap-year",
+	"./last-day-of-month",
 	"./pattern-re",
 	"./start-of",
 	"../common/create-error/unsupported-feature",
-	"../util/date/set-date",
 	"../util/date/set-month",
 	"../util/out-of-range"
-], function( datePatternRe, dateStartOf, createErrorUnsupportedFeature, dateSetDate,
-	dateSetMonth, outOfRange ) {
+], function( dateIsLeapYear, dateLastDayOfMonth, datePatternRe, dateStartOf,
+	createErrorUnsupportedFeature, dateSetMonth, outOfRange ) {
 
 /**
  * parse( value, tokens, properties )
@@ -20,7 +21,7 @@ define([
  * ref: http://www.unicode.org/reports/tr35/tr35-dates.html#Date_Format_Patterns
  */
 return function( value, tokens, properties ) {
-	var amPm, era, hour, hour12, timezoneOffset, valid,
+	var amPm, day, era, hour, hour12, timezoneOffset, totalDays, valid,
 		YEAR = 0,
 		MONTH = 1,
 		DAY = 2,
@@ -112,21 +113,12 @@ return function( value, tokens, properties ) {
 
 			// Day
 			case "d":
-				value = token.value;
-				if ( outOfRange( value, 1, 31 ) ) {
-					return false;
-				}
-				dateSetDate( date, value );
+				day = token.value;
 				truncateAt.push( DAY );
 				break;
 
 			case "D":
-				value = token.value;
-				if ( outOfRange( value, 1, 366 ) ) {
-					return false;
-				}
-				date.setMonth(0);
-				date.setDate( value );
+				totalDays = token.value;
 				truncateAt.push( DAY );
 				break;
 
@@ -249,6 +241,19 @@ return function( value, tokens, properties ) {
 		date.setFullYear( date.getFullYear() * -1 + 1 );
 	}
 
+	if ( day !== undefined ) {
+		if ( outOfRange( day, 1, dateLastDayOfMonth( date ) ) ) {
+			return null;
+		}
+		date.setDate( day );
+	} else if ( totalDays !== undefined ) {
+		if ( outOfRange( totalDays, 1, dateIsLeapYear( date.getFullYear() ) ? 366 : 365 ) ) {
+			return null;
+		}
+		date.setMonth(0);
+		date.setDate( totalDays );
+	}
+
 	if ( hour12 && amPm === "pm" ) {
 		date.setHours( date.getHours() + 12 );
 	}

test/unit/date/parse.js

@@ -16,7 +16,7 @@ define([
 ], function( Cldr, parse, parseProperties, startOf, tokenizer, numberTokenizerProperties,
 	enCaGregorian, enNumbers, likelySubtags, timeData, weekData ) {
 
-var cldr, date1, date2, midnight;
+var cldr, date1, date2, FakeDate, midnight;
 
 function assertParse( assert, stringDate, pattern, cldr, date ) {
 	var tokenizerProperties, tokens;
@@ -43,6 +43,36 @@ function assertParseTimezone( assert, stringDate, pattern, cldr, timezoneOffset
 		"` pattern `" + pattern + "`" );
 }
 
+FakeDate = (function( Date ) {
+	function FakeDate() {
+		var date;
+		if ( arguments.length === 0 ) {
+			return FakeDate.today;
+		}
+		if ( arguments.length === 1 ) {
+			date = new Date( arguments[ 0 ] );
+		} else if ( arguments.length === 2 ) {
+			date = new Date( arguments[ 0 ], arguments[ 1 ] );
+		} else if ( arguments.length === 3 ) {
+			date = new Date( arguments[ 0 ], arguments[ 1 ], arguments[ 2 ] );
+		} else if ( arguments.length === 4 ) {
+			date = new Date( arguments[ 0 ], arguments[ 1 ], arguments[ 2 ], arguments[ 3 ] );
+		} else if ( arguments.length === 5 ) {
+			date = new Date( arguments[ 0 ], arguments[ 1 ], arguments[ 2 ], arguments[ 3 ], arguments[ 4 ] );
+		} else if ( arguments.length === 6 ) {
+			date = new Date( arguments[ 0 ], arguments[ 1 ], arguments[ 2 ], arguments[ 3 ], arguments[ 4 ], arguments[ 5 ] );
+		} else if ( arguments.length === 7 ) {
+			date = new Date( arguments[ 0 ], arguments[ 1 ], arguments[ 2 ], arguments[ 3 ], arguments[ 4 ], arguments[ 5 ], arguments[ 6 ] );
+		}
+
+		/* jshint proto:true */
+		date.__proto__ = FakeDate.prototype;
+		return date;
+	}
+	FakeDate.prototype = FakeDate.today = new Date();
+	return FakeDate;
+})( Date );
+
 // Simple number parser for this test purposes.
 function simpleParseNumber( value ) {
 	return +value;
@@ -165,10 +195,31 @@ QUnit.test( "should parse month (MMMMM|LLLLL)", function( assert ) {
  */
 
 QUnit.test( "should parse day (d) with no padding", function( assert ) {
+	var OrigDate;
+
 	date1 = new Date();
 	date1.setDate( 2 );
 	date1 = startOf( date1, "day" );
 	assertParse( assert, "2", "d", cldr, date1 );
+
+	/* globals Date:true */
+	// Test #323 - Day parsing must use the correct day range given its corresponding month/year.
+	OrigDate = Date;
+	Date = FakeDate;
+
+	date1 = new Date( 2014, 1, 28 );
+	date1 = startOf( date1, "day" );
+	FakeDate.today = new Date( 2014, 1 );
+	assertParse( assert, "29", "d", cldr, null );
+	assertParse( assert, "28", "d", cldr, date1 );
+
+	date2 = new Date( 2016, 1, 29 );
+	date2 = startOf( date2, "day" );
+	FakeDate.today = new Date( 2016, 1 );
+	assertParse( assert, "30", "d", cldr, null );
+	assertParse( assert, "29", "d", cldr, date2 );
+
+	Date = OrigDate;
 });
 
 QUnit.test( "should parse day (dd) with padding", function( assert ) {