diff --git a/moment-timezone.js b/moment-timezone.js
index cd34f516..dbe7a03c 100644
--- a/moment-timezone.js
+++ b/moment-timezone.js
@@ -464,7 +464,8 @@
 	}
 
 	function needsOffset (m) {
-		return !!(m._a && (m._tzm === undefined));
+		var isUnixTimestamp = (m._f === 'X' || m._f === 'x');
+		return !!(m._a && (m._tzm === undefined) && !isUnixTimestamp);
 	}
 
 	function logError (message) {
diff --git a/tests/moment-timezone/needs-offset.js b/tests/moment-timezone/needs-offset.js
index 5f2e81ad..c55f94e7 100644
--- a/tests/moment-timezone/needs-offset.js
+++ b/tests/moment-timezone/needs-offset.js
@@ -21,6 +21,12 @@ exports['needs-offset'] = {
 		t.ok(needsOffset(moment.utc("Mar 4 2010", "MMM D YYYY")), 'Parsing a string and format needs an offset.');
 		t.done();
 	},
+	
+	'String + Timestamp Format': function(t) {
+		t.ok(!needsOffset(moment.utc("1267660800000", "x")), 'Parsing a string with timestamp format "x" does not need an offset.');
+		t.ok(!needsOffset(moment.utc("1267660800", "X")),    'Parsing a string with timestamp format "X" does not need an offset.');
+		t.done();
+	},
 
 	'String + Format + Offset' : function (t) {
 		t.ok(!needsOffset(moment("Mar 4 2010 +1000", "MMM D YYYY Z")),       'Parsing a string and format and offset does not need an offset.');
@@ -36,6 +42,14 @@ exports['needs-offset'] = {
 		t.ok(needsOffset(moment.utc("Mar 4 2010", formats)), 'Parsing a string and formats needs an offset.');
 		t.done();
 	},
+	
+	'String + Timestamp Formats': function(t) {
+		var formats = ["x", "X", "MMM D YYYY"];
+		t.ok(!needsOffset(moment.utc("1267660800000", formats)), 'Parsing a string with timestamp format "x" does not need an offset.');
+		t.ok(!needsOffset(moment.utc("1267660800", formats)),    'Parsing a string with timestamp format "X" does not need an offset.');
+		t.ok(needsOffset(moment("Mar 4 2010", formats)),         'Parsing a string and formats needs an offset.');
+		t.done();
+	},
 
 	'ISO 8601 String' : function (t) {
 		t.ok(needsOffset(moment("2011-10-10 10:10:10")),            'Parsing an ISO 8601 string without an offset needs an offset.');
diff --git a/tests/moment-timezone/parse.js b/tests/moment-timezone/parse.js
index 75810d8a..3a0bdacc 100644
--- a/tests/moment-timezone/parse.js
+++ b/tests/moment-timezone/parse.js
@@ -250,6 +250,28 @@ exports.parse = {
 
 		t.done();
 	},
+	
+	"check needsOffset in moment.tz with timestamp formats" : function (t) {
+		var tests = [
+				["1338534000000",  "x", "America/New_York",    1338534000000, "2012-06-01T03:00:00-04:00"],
+				["1338534000.000", "X", "America/New_York",    1338534000000, "2012-06-01T03:00:00-04:00"],
+				["1338534000000",  "x", "America/Los_Angeles", 1338534000000, "2012-06-01T00:00:00-07:00"],
+				["1338534000.000", "X", "America/Los_Angeles", 1338534000000, "2012-06-01T00:00:00-07:00"]
+			], i, parsed, input, format, timezone, expectedValue, expectedFormat, actualValue, actualFormat;
+
+		for (i = 0; i < tests.length; i++) {
+			input    = tests[i][0];
+			format = tests[i][1];
+			timezone = tests[i][2];
+			expectedValue = tests[i][3];
+			expectedFormat = tests[i][4];
+			parsed = moment.tz(input, format, true, timezone);
+			t.equal(parsed.valueOf(), expectedValue, "Parsing " + input + " with format " + format + " should have value " + expectedValue);
+			t.equal(parsed.format(), expectedFormat, "Parsing " + input + " with format " + format + " should equal " + expectedFormat);
+		}
+
+		t.done();
+	},
 
 	"parse in default zone" : function (t) {
 		moment.tz.setDefault("America/New_York");