* @param {Date|Number} date - the date to be changed
* @param {Number} amount - the amount of milliseconds to be subtracted. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
* @returns {Date} the new date with the milliseconds subtracted
* @throws {TypeError} 2 arguments required
*
* @example
* // Subtract 750 milliseconds from 10 July 2014 12:45:30.000: