getDatePattern(sStyle) {
			assert(sStyle == "short" || sStyle == "medium" || sStyle == "long" || sStyle == "full", "sStyle must be short, medium, long or full");
			return mSettings["dateFormats-" + sStyle];
		}
Returns the currently set date pattern or undefined if no pattern has been defined.
@param {"short"|"medium"|"long"|"full"} sStyle The date style (short, medium, long or full)
@returns {string} The resulting date pattern
@public
@since 1.120