Dart Flutter - How do I combine & convert separated date & time into one DateTime object-CodePudding

String oldDateStr = "2022-08-1";
String oldTimeStr = "03:10 pm";
DateTime? newDateTime;  //2022-08-01 13:10  (yyyy-MM-dd HH:mm) <----- TARGET

final olddateFormat = DateFormat("yyyy-MM-d");
final newdateFormat = DateFormat("yyyy-MM-dd");
final oldtimeFormat = DateFormat("hh:mm a");
final timeFormatter = DateFormat("HH:mm");

DateTime oldTime12 = oldtimeFormat.parse(oldTimeStr.toUpperCase());
DateTime newTime24 = DateTime.parse(timeFormatter.format(oldTime12)); //This line is culprit  in print() debug
DateTime oldDate = olddateFormat.parse(oldDateStr);
DateTime newDate = DateTime.parse(newdateFormat.format(oldDate));

I tried & combined various answers from SO posts but couldn't figure this out. So I'm posting the question by helplessness.

CodePudding user response：

The accepted format is yyyy-MM-dd hh:mm aaa. am/pm marker assumes capital letters e.g PM.

import 'package:intl/intl.dart';

void main() {
  String oldDateStr = "2022-08-1";
  String oldTimeStr = "03:10 pm";

  final result = DateFormat("yyyy-MM-dd hh:mm aaa").parse(
    '$oldDateStr $oldTimeStr'.replaceAll('pm', 'PM').replaceAll('am', 'AM'),
  );
  print(result); // 2022-08-01 15:10:00.000
}

See DateFormat for more information.

CodePudding user response：

use this package to combine date and time and convert your datetime format to DateTime

String oldDateStr = "2022-08-1";
String oldTimeStr = "03:10 pm";

final String dateTimeString = oldDateStr  " "   oldTimeStr;
final DateFormat format = new DateFormat("yyyy-MM-dd hh:mm a");
print (format.parse(dateTimeString));

CodePudding user response：

You can get formatted date like this, make a function if you are using it frequently.

  String oldDateStr = "2022-08-01";
  String oldTimeStr = "03:10 pm";
  DateTime? newDateTime;
  String newDate = (oldDateStr   " " oldTimeStr.substring(0, 5)   ":00.000");
  DateFormat formatter = DateFormat ('yyyy-MM-dd hh:mm');
  DateTime nt = DateTime.parse(newDate);
  print(formatter.format(nt));