确定具体的日期

本文关键字：日期 | 更新日期: 2023-09-27 18:18:31

我正在使用c#中的日期，需要计算一些进一步的日期。取当前的datetime。

如何得到以下值?

  • 一天结束
  • 月末
  • 年度末

确定具体的日期

如果您所说的end of ...是指当天的12:59:59.999PM，那么:

  • 一天结束

    var today = DateTime.Today;
var endOfDay = new DateTime(
    today.Year, 
    today.Month,
    today.Day,
    23,
    59,
    59,
    999
);

  • 月末

    var today = DateTime.Today;
var endOfMonth = new DateTime(
    today.Year, 
    today.Month,
    DateTime.DaysInMonth(today.Year, today.Month),
    23,
    59,
    59,
    999
);

  • 年末

    var today = DateTime.Today;
var endOfYear = new DateTime(
    today.Year,
    12,
    31,
    23,
    59,
    59,
    999
);

如果你有别的意思，那就解释一下你的意思。

对于月底

DateTime today = DateTime.Today;
DateTime endOfMonth = new DateTime(today.Year, today.Month, DateTime.DaysInMonth(today.Year, today.Month));

参见如何在c#中获得一个月的最后一天?

对于年末

DateTime endOfYear = new DateTime(today.Year, 12, 31);

对于一天的结束，假设一天的结束是在下午5点结束营业

DateTime endOfDay = new DateTime(today.Year, today.Month, today.day, 17, 0, 0); // Assuming the business end of day is at 5 PM

查看更多关于datetime的信息，请访问http://msdn.microsoft.com/en-us/library/system.datetime.aspx

月最后一天:

DateTime today = DateTime.Now;
DateTime lastDayOfMonth = new DateTime(today.Year, today.Month, DateTime.DaysInMonth(today.Year, today.Month));

年尾日:

DateTime today = DateTime.Now;
DateTime lastDayOfYear = new DateTime(today.Year, 12, 31);
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