Dart로 날짜를 포맷하려면 어떻게합니까?

Dart로 날짜를 포맷하려면 어떻게합니까?

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의 인스턴스가 DateTime있으며 String 형식으로 지정하고 싶습니다. 어떻게하나요? 날짜를 "2013-04-20"과 같은 문자열로 바꾸고 싶습니다.

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intl패키지 ( installer )를 사용하여 날짜 형식을 지정할 수 있습니다 .

의 경우 en_US형식은 매우 간단합니다 :

import 'package:intl/intl.dart';

main() {
  var now = new DateTime.now();
  var formatter = new DateFormat('yyyy-MM-dd');
  String formatted = formatter.format(now);
  print(formatted); // something like 2013-04-20
}

형식화에 대한 많은 옵션이 있습니다. 문서에서 :

 ICU Name                   Skeleton
 --------                   --------
 DAY                          d
 ABBR_WEEKDAY                 E
 WEEKDAY                      EEEE
 ABBR_STANDALONE_MONTH        LLL
 STANDALONE_MONTH             LLLL
 NUM_MONTH                    M
 NUM_MONTH_DAY                Md
 NUM_MONTH_WEEKDAY_DAY        MEd
 ABBR_MONTH                   MMM
 ABBR_MONTH_DAY               MMMd
 ABBR_MONTH_WEEKDAY_DAY       MMMEd
 MONTH                        MMMM
 MONTH_DAY                    MMMMd
 MONTH_WEEKDAY_DAY            MMMMEEEEd
 ABBR_QUARTER                 QQQ
 QUARTER                      QQQQ
 YEAR                         y
 YEAR_NUM_MONTH               yM
 YEAR_NUM_MONTH_DAY           yMd
 YEAR_NUM_MONTH_WEEKDAY_DAY   yMEd
 YEAR_ABBR_MONTH              yMMM
 YEAR_ABBR_MONTH_DAY          yMMMd
 YEAR_ABBR_MONTH_WEEKDAY_DAY  yMMMEd
 YEAR_MONTH                   yMMMM
 YEAR_MONTH_DAY               yMMMMd
 YEAR_MONTH_WEEKDAY_DAY       yMMMMEEEEd
 YEAR_ABBR_QUARTER            yQQQ
 YEAR_QUARTER                 yQQQQ
 HOUR24                       H
 HOUR24_MINUTE                Hm
 HOUR24_MINUTE_SECOND         Hms
 HOUR                         j
 HOUR_MINUTE                  jm
 HOUR_MINUTE_SECOND           jms
 HOUR_MINUTE_GENERIC_TZ       jmv
 HOUR_MINUTE_TZ               jmz
 HOUR_GENERIC_TZ              jv
 HOUR_TZ                      jz
 MINUTE                       m
 MINUTE_SECOND                ms
 SECOND                       s

en_US가 아닌 날짜의 경우 로케일에 명시 적으로로드해야합니다. 자세한 내용은 https://www.dartdocs.org/documentation/intl/latest/intl/DateFormat-class.html 을 참조 하십시오 .

---

이것도 작동합니다.

DateTime today = new DateTime.now();
String dateSlug ="${today.year.toString()}-${today.month.toString().padLeft(2,'0')}-${today.day.toString().padLeft(2,'0')}";
print(dateSlug);

---

이렇게하면 소셜 네트워크에서와 같은 날짜가 표시됩니다. [ "오늘", "어제", "요일"등.]

void main() {
      DateTime now = new DateTime(2018,6,26);
      print(date(now));
    }

    String date(DateTime tm) {
      DateTime today = new DateTime.now();
      Duration oneDay = new Duration(days: 1);
      Duration twoDay = new Duration(days: 2);
      Duration oneWeek = new Duration(days: 7);
      String month;
      switch (tm.month) {
        case 1:
          month = "january";
          break;
        case 2:
          month = "february";
          break;
        case 3:
          month = "march";
          break;
        case 4:
          month = "april";
          break;
        case 5:
          month = "may";
          break;
        case 6:
          month = "june";
          break;
        case 7:
          month = "july";
          break;
        case 8:
          month = "august";
          break;
        case 9:
          month = "september";
          break;
        case 10:
          month = "october";
          break;
        case 11:
          month = "november";
          break;
        case 12:
          month = "december";
          break;
      }

      Duration difference = today.difference(tm);

      if (difference.compareTo(oneDay) < 1) {
        return "today";
      } else if (difference.compareTo(twoDay) < 1) {
        return "yesterday";
      } else if (difference.compareTo(oneWeek) < 1) {
        switch (tm.weekday) {
          case 1:
            return "monday";
          case 2:
            return "tuesday";
          case 3:
            return "wednesday";
          case 4:
            return "thurdsday";
          case 5:
            return "friday";
          case 6:
            return "saturday";
          case 7:
            return "sunday";
        }
      } else if (tm.year == today.year) {
        return '${tm.day} $month';
      } else {
        return '${tm.day} $month ${tm.year}';
      }
      return "";
    }

---

You can also specify the date format like stated earlier: https://pub.dartlang.org/documentation/intl/latest/intl/DateFormat-class.html

import 'package:intl/intl.dart';
String formatDate(DateTime date) => new DateFormat("MMMM d").format(date);

Produces: March 4

---

There is a package date_format

dependencies:
    date_format: ^1.0.6

code

import 'package:date_format/date_format.dart';

final formattedStr = formatDate(
    yourDateTime, [dd, '.', mm, '.', yy, ' ', HH, ':', nn]);

// output example "29.03.19 07:00"

Pay attention: minutes are nn

link to the package

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You can also use this function.

String getFormattedTime(int totalSeconds) {

    if (totalSeconds < 0) {
      return "00:00:00";
    }

    int remainingHours = (totalSeconds / 3600).floor();
    int remainingMinutes = (totalSeconds / 60).floor() - remainingHours * 60;
    int remainingSeconds = totalSeconds - remainingMinutes * 60 - remainingHours * 3600;

    return remainingHours.toString().padLeft(2, '0') +
        ":" +
        remainingMinutes.toString().padLeft(2, '0') +
        ":" +
        remainingSeconds.toString().padLeft(2, '0');
  }

Input: 3600 (in sec)

Output: 01:00:00

padLeft(2, '0')

Has been used to format the final string(i.e to add a trailing zero).

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If someone wants to convert a date in string format first use DateTime.parse("2019-09-10") then pass it to DateTime.format() like

dateFormate = DateFormat("dd-MM-yyyy").format(DateTime.parse("2019-09-30"));

Reference: Dart - How to change format of simple date string which is in yyyy-MM-dd to dd-MM-yyyy

참고URL : https://stackoverflow.com/questions/16126579/how-do-i-format-a-date-with-dart