From 014cf0c58c51d39819b6f1136ea2ee24f646e572 Mon Sep 17 00:00:00 2001
From: Dan <dan@anycapper.com>
Date: Mon, 26 Jun 2017 20:58:04 -0500
Subject: [PATCH] Convert to tz keeping wall time

---
 moment-timezone.js           | 4 ++--
 tests/moment-timezone/utc.js | 5 +++++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/moment-timezone.js b/moment-timezone.js
index 644abc61..71ab9ac0 100644
--- a/moment-timezone.js
+++ b/moment-timezone.js
@@ -545,11 +545,11 @@
 		}
 	};
 
-	fn.tz = function (name) {
+	fn.tz = function (name, keepTime) {
 		if (name) {
 			this._z = getZone(name);
 			if (this._z) {
-				moment.updateOffset(this);
+				moment.updateOffset(this, keepTime);
 			} else {
 				logError("Moment Timezone has no data for " + name + ". See http://momentjs.com/timezone/docs/#/data-loading/.");
 			}
diff --git a/tests/moment-timezone/utc.js b/tests/moment-timezone/utc.js
index 9690b6a8..ce78026a 100644
--- a/tests/moment-timezone/utc.js
+++ b/tests/moment-timezone/utc.js
@@ -42,6 +42,11 @@ exports.utc = {
 		test.equal(helpers.getUTCOffset(m), localOffset, "Should reset the offset to local time when using moment.fn.local");
 		test.equal(m.format(), localFormat, "Should reset the offset to local time when using moment.fn.local");
 
+		m = moment('2017-01-01T00:00:00');
+		var utcWallTimeFormat = m.clone().utcOffset('-05:00', true).format();
+		m.tz('America/New_York', true);
+		test.equal(m.format(), utcWallTimeFormat, "Should change the offset while keeping wall time when passing an optional parameter to moment.fn.tz");
+		
 		test.done();
 	}
 };