Dart中的DateTime比较 [英] DateTime comparison in dart

问题描述

我正在尝试按升序对DateTime时间元素列表进行排序.我已经实现了>或<等常规运算符.不要切.比较两个DateTime变量的最佳方法是什么?

I am trying to sort list of DateTime time elements in ascending order.I have realized normal operators like > or < don't cut it. What is the best way to compare two DateTime variables ?

推荐答案

只需使用方法 isAfter()， isBefore()或 isAtSameMomentAs()来自 DateTime .

Simply use the methods isAfter(), isBefore() or isAtSameMomentAs() from DateTime.

其他替代方法，如文档中所述，使用 compareTo(DateTime other):

Other alternative, use compareTo(DateTime other), as in the docs:

将此DateTime对象与[other]进行比较，如果值相等，则返回零.

Compares this DateTime object to [other], returning zero if the values are equal.

如果此DateTime [isBefore] [other]返回一个负值.返回0如果它是[isAtSameMomentAs] [other]，则返回正值；否则(当此[isAfter] [other]时).

Returns a negative value if this DateTime [isBefore] [other]. It returns 0 if it [isAtSameMomentAs] [other], and returns a positive value otherwise (when this [isAfter] [other]).

下面是对日期进行排序的代码示例:

Here a code example of sorting dates:

void main() {
  var list = [
    DateTime.now().add(Duration(days: 3)),
    DateTime.now().add(Duration(days: 2)),
    DateTime.now(),
    DateTime.now().subtract(Duration(days: 1))
  ];

  list.sort((a, b) => a.compareTo(b));
  print(list);
}

此处.

这篇关于Dart中的DateTime比较的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！