var dateTime = DateTime.parse("dateTimeString");
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));
DateTime.parse("string date here");