Add Get The Time Zone Of The Client Computer as a javascript til

javascript/get-the-time-zone-of-the-client-computer.md

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+# Get The Time Zone Of The Client Computer
+
+The
+[`resolvedOptions`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DateTimeFormat/resolvedOptions)
+function on `Intl.DateTimeFormat.prototype` provides a number of pieces of
+information about the client computer. It includes information such as the
+locale and the numbering system. It also has the time zone for that machine.
+
+Try running this line of JavaScript in your own browser.
+
+```javascript
+$ Intl.DateTimeFormat().resolvedOptions().timeZone
+```
+
+When I run it, I get `America/Chicago`.
+
+You can use this within your client-side code as a way of determining in
+which time zone your users are.