Use Intl API for guessing when available

moment · Jan 15, 2016 · 49e4c66 · 49e4c66
1 parent 52d896c
commit 49e4c66
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/moment-timezone.js b/moment-timezone.js
@@ -318,6 +318,15 @@
 	}
 
 	function rebuildGuess () {
+
+		// use Intl API when available and returning valid time zone
+		if (Intl && isFunction(Intl.DateTimeFormat)) {
+			var zone = Intl.DateTimeFormat().resolvedOptions().timeZone;
+			if (zone && (zone.indexOf("/") > -1 || zone === 'UTC')) {
+				return zone;
+			}
+		}
+
 		var offsets = userOffsets(),
 			offsetsLength = offsets.length,
 			guesses = guessesForUserOffsets(offsets),