function localToUTC( objTextarea ) {
	try {
		// Search for every instance of [mytime]
		const pattern = "\\[mytime\\](.*?)\\[\\/mytime\\]";
		var messageValue = objTextarea.value;
		var regEx = RegExp( pattern, "gi" )
		while( regEx.test( messageValue ) ) {
			var before = RegExp.leftContext;
			var after = RegExp.rightContext;
			messageValue = before + "[localtime]" + $.localtime.toUTCTime( RegExp.$1, "yyyy-MM-dd HH:mm:ss.SSSZ" ) + "[/localtime]" + after;
		}
		objTextarea.value = messageValue;
	} catch ( e ) {
		alert( "Incorrectly formatted [mytime]: " + e);
		return false;
	}

	return true;
}