如何获取特定月份的天数? [英] How to get the number of days in a specific month?

问题描述

在Dart语言中，如何获取特定月份的天数?

In the Dart language, how do I get the number of days in a specific month?

例如:

DateTime dateTime = DateTime(2017, 2, 1); //Feb 2017

例如，如何获得2017年2月的最大天数?

How do I get the maximum number of days in Feb 2017, for example?

我的问题是关于Dart语言的.

My question is about the Dart language.

推荐答案

您可以使用 date_utils 具有 lastDayOfMonth 方法的软件包.

You can use the date_utils package which has the lastDayOfMonth method.

添加依赖项:

dev_dependencies:
    date_utils: ^0.1.0

导入程序包:

import 'package:date_utils/date_utils.dart';

然后使用它:

final DateTime date = new DateTime(2017, 2);
final DateTime lastDay = Utils.lastDayOfMonth(date);
print("Last day in month : ${lastDay.day}");

结果:

一个月的最后一天:28

Last day in month : 28

如果您不想仅包含该功能的软件包，则定义如下:

If you don't want to include the package just for that function, here is the definition :

/// The last day of a given month
static DateTime lastDayOfMonth(DateTime month) {
  var beginningNextMonth = (month.month < 12)
      ? new DateTime(month.year, month.month + 1, 1)
      : new DateTime(month.year + 1, 1, 1);
  return beginningNextMonth.subtract(new Duration(days: 1));
}

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