在c#中，如何获得下一个季度的最后一天给出日期。？

Question

In c#, how to get the last day of next quarter giving the date?

For example, given date is 2014-12-02, I need to return the date 2015-03-31.

Answer 1

Very simple:

var given = new DateTime(2014, 02, 12);

var result =
    given.Date
        .AddDays(1 - given.Day)
        .AddMonths(3 - (given.Month - 1) % 3)
        .AddDays(-1);

//2014-03-31

If I input 2014-08-12 I get 2014-09-30 .

Here are the results for the start of each month for the year:

Is that what you wanted?

Answer 2

Be carefull with this code! For example date 31.01.2018 will return 30.03.2018. This will work as expected:

var given = new DateTime(2018, 01, 31);    
var result =
        given.Date
            .AddMonths(3 - (given.Month - 1) % 3);
    result = result.AddDays(-result.Day);
//2018-03-31