有没有更好的方法可以将日期与另一个日期进行比较? [英] Is there a better way to compare a date against another?

问题描述

我的代码是:

  for (var rt in list) {
    if (rt.date.day == date2.day &&
        rt.date.month == date2.month &&
        rt.date.year == date2.year) {
      ...
    }
  }

是否有更好的方法将日期与另一个日期进行比较?

Is there a better way to compare a date against another?

推荐答案

您可以创建一个辅助函数来节省时间:

You can make a helper function to strip off the time:

DateTime dateOnly(DateTime dateTime) => DateTime(dateTime.year, dateTime.month, dateTime.day);

，然后您可以使用 DateTime 的常规 operator == :

and then you can use DateTime's normal operator ==:

if (dateOnly(rt.date) == dateOnly(date2)) {
  ...
}

请注意，上面的示例假定两个日期都在相同的时区中.如果它们可能位于不同的时区，则应精确定义两个 DateTime 具有相同的日期"的含义，然后将两者都转换为相同的时区(可能是UTC).

Note that the above example assumes both dates are in the same time zone. If they might be in different time zones, you should precisely define what it means for two DateTimes to have the same "date" and convert both to a common time zone (possibly UTC).

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