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README.md

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+tzdetect.js
+===========
+
+Goals
+-----
+
+* detect the user timezone, or more precisely list all IANA time zone ids that are compatible with the running javascript engine
+* limit data duplication by using the Moment.js version of the Olson tables
+
+Demo
+----
+
+See http://dystroy.org/stackoverflow/timezonedetect.html
+
+Usage
+-----
+
+	<script src="moment-with-langs.min.js"></script>
+	<script src="moment-timezone-with-data.min.js"></script>
+	<script src="tzdetect.js"></script>
+	<script>
+		var tzid = tzdetect.matches()[0]; // for example : "Europe/Paris"
+	</script>
+
+Related
+-------
+
+	http://stackoverflow.com/questions/19420582/detect-the-id-of-the-current-user-timezone-using-moment-js

bower.json

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+{
+  "name": "moment-tzdetect",
+  "version": "0.1.0",
+  "homepage": "https://github.com/jamesjieye/tzdetect.js",
+  "authors": [
+    "Canop <[email protected]>"
+  ],
+  "description": "A JavaScript library to detect the timezone using Moment.js",
+  "main": "tzdetect.js",
+  "keywords": [
+    "moment",
+    "timezone"
+  ],
+  "license": "MIT",
+  "ignore": [
+    "**/.*",
+    "node_modules",
+    "bower_components",
+    "test",
+    "tests"
+  ]
+}

tzdetect.js

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+// A small public domain library detecting the user's timezone using moment.js
+// Repository : https://github.com/Canop/tzdetect.js
+// Usage :
+//   tzdetect.matches()     : array of all timezones matching the user's one
+//   tzdetect.matches(base) : array of all timezones matching the supplied one
+var tzdetect = {
+	names: moment.tz.names(),
+	matches: function(base){
+		var results = [], now = Date.now(), makekey = function(id){
+			return [0, 4, 8, -5*12, 4-5*12, 8-5*12, 4-2*12, 8-2*12].map(function(months){
+				var m = moment(now + months*30*24*60*60*1000);
+				if (id) m.tz(id);
+				return m.format("DDHHmm");
+			}).join(' ');
+		}, lockey = makekey(base);
+		tzdetect.names.forEach(function(id){
+			if (makekey(id)===lockey) results.push(id);
+		});
+		return results;
+	}
+};