Question

我正在使用C＃中的日期，需要计算更多日期。取当前datetime。

如何获得以下值？

一天结束
月底
年末

Answer 1

如果当天end of ...表示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
);

月底

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
);

如果你的意思是别的，那就解释一下你的意思。

Answer 2

月末

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

请参阅How can I get the last day of the month in C#?

年末

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

对于一天结束，假设一天结束时间下午5点结束

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

在http://msdn.microsoft.com/en-us/library/system.datetime.aspx

查看有关日期时间的详情

Answer 3

每月的最后一天：

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

一年的最后一天：

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

获取具体日期

3 个答案: