.Net DateTime会计季度

Question

有谁知道如何在.NET中构建DateTime以成为本季度的第一天？

Answer 1

public DateTime GetCurrentQuarter(DateTime date) 
{ 
    int startingMonthOfQuarter = (((date.Month - 1)/3) * 3) + 1; 

    return new DateTime(date.Year, startingMonthOfQuarter, 1); 
} 

Answer 2

 var currentTime = DateTime.Now; 
     var year = currentTime.Year; 
     DateTime[] quarterStarts = {new DateTime(year, 1, 1), new DateTime(year, 4, 1), new DateTime(year, 7, 1), new DateTime(year, 10, 1)}; 
     var currentStart = quarterStarts.Where(s => s < currentTime).Last(); 

Answer 3

@yogesh是正确的，这是我在SQL SP利用：

CREATE FUNCTION [dbo].[fn_startOfQtr](@dt DATETIME) 
RETURNS DATETIME AS 
BEGIN 
    declare @ret DATETIME 
    declare @qtr int 

    set @qtr = ((month(@dt)-1)/3)+1 
    set @ret = cast(str(@qtr * 3 - 2) + '/1/' + str(year(@dt)) as DATETIME) 
    return @ret 
END