fnNoOffset = function(s) {
					// treat all date time strings as UTC timestamps
					if (!rHasTimezoneOffset.test(s)) {
						s += "Z";
					}
					// to avoid rounding issues truncate the nanoseconds part of the timestamp
					s = s.replace(rTruncateNanoseconds, "$1");

					return new Date(s).getTime();
				}
Converts a datetime format date string into a JSON date format string.

@return {string} the date.

@private