Intl.DateTimeFormat add timeZone data

polyfills/Intl/DateTimeFormat/~timeZone/all/config.toml

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+#### Dependencies
+dependencies = [
+  "Intl.DateTimeFormat"
+]
+
+#### Specification Link
+spec = "https://tc39.es/ecma402/#sec-initializedatetimeformat"
+
+#### Documentation Link
+docs = "https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat#using_options"
+
+#### License
+license = "MIT"
+
+#### Notes
+notes = [
+  "See formatjs documentation for more info on 'golden' vs 'all' timezones. https://formatjs.io/docs/polyfills/intl-datetimeformat"
+]
+
+#### Browser compatibility
+[browsers]
+android = "*"
+ie = "9 - *"
+ie_mob = "9 - *"
+edge = "<79"
+edge_mob = "<79"
+firefox = "*"
+opera = "*"
+chrome = "<76"
+safari = "*"
+ios_saf = "*"
+firefox_mob = "*"
+samsung_mob = "*"
+
+[install]
+module = "@formatjs/intl-datetimeformat"
+paths = [ "/add-all-tz.js" ]
+clean = [
+  "polyfill.js",
+]

polyfills/Intl/DateTimeFormat/~timeZone/all/detect.js

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+(function (global) {
+	if ('Intl' in global && 'DateTimeFormat' in global.Intl && 'format' in global.Intl.DateTimeFormat.prototype) {
+			try {
+				return (new Intl.DateTimeFormat('en', {
+					timeZone: 'Africa/Dakar',
+					timeZoneName: 'short'
+				}).format(new Date(Date.UTC(2012, 11, 20, 3, 0, 0, 200))).slice(-3) === 'GMT');
+			} catch(e) {
+				return false;
+			}
+	}
+
+	return false;
+}(self))