diff --git a/index.js b/index.js
index 753cfd1..1e04c8f 100644
--- a/index.js
+++ b/index.js
@@ -40,5 +40,43 @@ function diff( opts, subjects ){
 }
 
 function isStrictEqual( a, b ){
+	/* Date */
+	if (a instanceof Date && !(b instanceof Date)) return false;
+	else if (!(a instanceof Date) && b instanceof Date) return false;
+	else if (a instanceof Date && b instanceof Date)
+		return a.getTime() === b.getTime();
+
+	/* Array */
+	else if (Array.isArray(a) && !Array.isArray(b)) return false;
+	else if (!Array.isArray(a) && Array.isArray(b)) return false;
+	else if (Array.isArray(a) && Array.isArray(b)) {
+		if (a.length != b.length) return false;
+		for (var i = 0; i < a.length; i++) {
+			if (a[i] != b[i]) return false;
+		}
+
+		return true;
+	}
+	/* Object */
+	else if (typeof a === 'object' && typeof b !== 'object') return false;
+	else if (typeof a !== 'object' && typeof b === 'object') return false;
+	else if (typeof a == 'object' && typeof b === 'object') {
+		var keysA = Object.keys(a);
+		var keysB = Object.keys(b);
+		if (keysA.length != keysB.length) return false;
+		for (var i = 0; i < keysA.length; i++) {
+			if (typeof b[keysA[i]] === 'undefined') return false;
+			if (!isStrictEqual(a[keysA[i]], b[keysA[i]])) return false;
+		}
+
+		for (var i = 0; i < keysB.length; i++) {
+			if (typeof a[keysB[i]] === 'undefined') return false;
+			if (!isStrictEqual(a[keysB[i]], b[keysB[i]])) return false;
+		}
+
+		return true;
+	}
+
+	/* Value */
 	return a === b;
 }
diff --git a/test.js b/test.js
index d2df132..95af979 100644
--- a/test.js
+++ b/test.js
@@ -9,6 +9,7 @@ test(function( t ) {
 		power: 54,
 		height: undefined,
 		level: 1,
+		skills: ['magic', 'running']
 	};
 
 	var b = {
@@ -16,6 +17,7 @@ test(function( t ) {
 		power: 22,			// changed
 		level: undefined,	// changed
 		weight: 10,			// added
+		skills: ['magic', 'running'] // unchanged
 	};
 
 	t.deepEqual(diff(a, b), {
@@ -30,6 +32,7 @@ test(function( t ) {
 		level: 100,				// changed
 		material: 'steel',		// added
 		location: undefined,	// added but undefined
+		skills: ['magic', 'running', 'climbing'] // changed
 	};
 
 	t.deepEqual(diff(a, b, c), {
@@ -38,6 +41,7 @@ test(function( t ) {
 		level: 100,
 		weight: 10,
 		material: 'steel',
+		skills: ['magic', 'running', 'climbing']
 	});
 
 	t.deepEqual(diff({}, {}), {});
@@ -60,8 +64,7 @@ test('Custom equality', function( t ) {
 	};
 
 	t.deepEqual(diff(a, b), {
-		created: new Date(created),
-		updated: now,
+		updated: now
 	}, 'expected default behavior');
 
 	t.deepEqual(diff.custom({