string to datetime flutter

DateTime tempDate = new DateFormat("yyyy-MM-dd hh:mm:ss").parse(savedDateString);

import 'package:intl/intl.dart';

...

var dmyString = '23/4/1999';
var dateTime1 = DateFormat('d/M/y').parse(dmyString);

var mdyString = '04/23/99'; 
var dateTime2 = DateFormat('MM/dd/yy').parse(mdyString);

var mdyFullString = 'April 23, 1999';
var dateTime3 = DateFormat('MMMM d, y', 'en_US').parse(mdyFullString));

TimeOfDay _startTime = TimeOfDay(hour:int.parse(s.split(":")[0]),minute: int.parse(s.split(":")[1]));