I am trying to display the current DateTime in a Text widget after tapping on a button. The following works, but I'd like to change the format.

Current approach

DateTime now = DateTime.now();
currentTime = new DateTime(now.year, now.month, now.day, now.hour, now.minute);
 Text('$currentTime'), 

Result

YYYY-MM-JJ HH-MM:00.000

Question

How can I remove the :00.000 part?

Nitneuq

Ответы (14)

You can use DateFormat from intl package.

import 'package:intl/intl.dart';

DateTime now = DateTime.now();
String formattedDate = DateFormat('yyyy-MM-dd – kk:mm').format(now);

Add intl package to your pubspec.yaml file.

import 'package:intl/intl.dart';

DateFormat dateFormat = DateFormat("yyyy-MM-dd HH:mm:ss");

Converting DateTime object to String

String string = dateFormat.format(DateTime.now());

Converting String to DateTime object

DateTime dateTime = dateFormat.parse("2019-07-19 8:40:23");

Here's my simple solution. That does not require any dependency.

However, the date will be in string format. If you want the time then change the substring values

print(new DateTime.now()
            .toString()
            .substring(0,10)
     );   // 2020-06-10

Use this function

todayDate() {
    var now = new DateTime.now();
    var formatter = new DateFormat('dd-MM-yyyy');
    String formattedTime = DateFormat('kk:mm:a').format(now);
    String formattedDate = formatter.format(now);
    print(formattedTime);
    print(formattedDate);
  }

Output:

08:41:AM
21-12-2019

there is some change since the 0.16 so here how i did,

import in the pubspec.yaml

dependencies:
      flutter:
        sdk: flutter
      intl: ^0.16.1

then use

  txdate= DateTime.now()


  DateFormat.yMMMd().format(txdate)

You cant format dates in dart ,so you require to use external packages ,I would recommend this article : https://www.geeksforgeeks.org/format-dates-in-flutter/

DateTime.now() is deprecated, use clock.now() instead:

import 'package:clock/clock.dart';

DateTime now = clock.now();
String formattedDate = DateFormat('yyyy-MM-dd – kk:mm').format(now);

You can also use this syntax. For YYYY-MM-JJ HH-MM:

var now = DateTime.now();
var month = now.month.toString().padLeft(2, '0');
var day = now.day.toString().padLeft(2, '0');
var text = '${now.year}-$month-$day ${now.hour}:${now.minute}';

What if user is US citizen but wants to see everything in 24hour format - then
showing 12/24 hour based of locale will not satisfy user

 // getting system settings 12/24 h format
      if (MediaQuery.of(context).alwaysUse24HourFormat){
        timeFormat = new DateFormat("kk:mm", languageCode); //24h format
      }
      else{
        timeFormat = new DateFormat("KK:mm a", languageCode); //12h format
      }
//then use it:
 '${timeFormat.format DateTime.now())}'
static String convertDateFormat(String dateTimeString, String oldFormat, String 
           newFormat) {
        DateFormat newDateFormat = DateFormat(newFormat);
        DateTime dateTime = DateFormat(oldFormat).parse(dateTimeString);
        String selectedDate = newDateFormat.format(dateTime);
        return selectedDate;
            }

call this method this way

 convertDateFormat(inputDate, "dd-mm-yyyy", "d MMM yyyy");

Use String split method to remove :00.000

var formatedTime = currentTime.toString().split(':')
Text(formatedTime[0])

======= OR USE BELOW code for YYYY-MM-DD HH:MM:SS format without using library ====

var stringList =  DateTime.now().toIso8601String().split(new RegExp(r"[T\.]"));
var formatedDate = "${stringList[0]} ${stringList[1]}";

Try out this package, Jiffy, it also runs on top of Intl, but makes it easier using momentjs syntax. See below

import 'package:jiffy/jiffy.dart';   

var now = Jiffy().format("yyyy-MM-dd HH:mm:ss");

You can also do the following

var a = Jiffy().yMMMMd; // October 18, 2019

And you can also pass in your DateTime object, A string and an array

var a = Jiffy(DateTime(2019, 10, 18)).yMMMMd; // October 18, 2019

var a = Jiffy("2019-10-18").yMMMMd; // October 18, 2019

var a = Jiffy([2019, 10, 18]).yMMMMd; // October 18, 2019

With this approach, there is no need to import any library.

DateTime now = DateTime.now();

String convertedDateTime = "${now.year.toString()}-${now.month.toString().padLeft(2,'0')}-${now.day.toString().padLeft(2,'0')} ${now.hour.toString().padLeft(2,'0')}-${now.minute.toString().padLeft(2,'0')}";

Output

2020-12-05 14:57

How about a simple extension method for DateTime. Run-time is probably not great, since we're iterating the string multiple times and iterating over each % format option. Could probably walk through once and replace % greedily.

extension DateTimeFormat on DateTime {

  /// Supports the following, inspired by: https://linux.die.net/man/3/strptime
  /// %Y: The year, including century (for example, 1991).
  /// %m: The month number (1-12).
  /// %d: The day of month (1-31).
  /// %H: The hour (0-23).
  /// %M: The minute (0-59).
  /// %S: The second (0-59).
  String format(String formatString) {
    var hourString = hour.toString();
    var dayString = day.toString();
    var monthString = month.toString();
    var minuteString = minute.toString();
    var secondString = second.toString();
    var yearString = year.toString();

    var map = {
      '%H': hourString.padLeft(3 - hourString.length, '0'), // the pad values here are the desired length + 1
      '%d': dayString.padLeft(3 - dayString.length, '0'),
      '%m': monthString.padLeft(3 - monthString.length, '0'),
      '%M': minuteString.padLeft(3 - minuteString.length, '0'),
      '%S': secondString.padLeft(3 - secondString.length, '0'),
      '%Y': yearString.padLeft(5 - yearString.length, '0'),
    };
    return map.entries.fold(formatString, (acc, entry) => acc.replaceAll(entry.key, entry.value));
  }
}

Usage:

print(DateTime(2021, 10, 16, 4, 4, 4, 4, 4).format('%Y-%m-%d-%H-%M-%S'));
// '2021-10-16-04-04-04'

Feel free to suggest changes.

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