# WallTimeToUTC

Converts a datetime from a specified timezone to UTC.

## Signature

`WallTimeToUTC (Date date, string timezone, function callback)`

## Parameters

***date*:** Type: `Date`. A JavaScript `Date` object.

***timezone*:** Type: `String`. A time zone ID based on the \`\` class, for example, `"America/Los_Angeles"`.

***callback***

Type: `function`

A function to call after the conversion is done. Access the converted value in the first parameter of the callback.