从给定日期计算季度的开始日期和名称

Question

如何从给定日期找到季度的开始日期和名称（1，2，3等）？

Answer 1

喜欢的东西（未经测试）：

DateTime date; 
int quarterNumber = (date.Month-1)/3+1; 
DateTime firstDayOfQuarter = new DateTime(date.Year, (quarterNumber-1)*3+1,1); 
DateTime lastDayOfQuarter = firstDayOfQuarter.AddMonths(3).AddDays(-1); 

Answer 2

int GetQuarterName(DateTime myDate) 
{ 
    return (int)Math.Ceiling(myDate.Month/3.0); 
} 

DateTime GetQuarterStartingDate(DateTime myDate) 
{ 
    return new DateTime(myDate.Year,(3*GetQuarterName(myDate))-2,1); 
} 

GetQuarterName获得当月的 “下一个” 整数值数/ 3

GetQuarterStartingDate使用从GetQuarterName输出摸出月份值，原始日期的年份部分，1代表要返回的月份的第一天。

（道歉做没有意义的，我有流感。:(）

Answer 3

https://msdn.microsoft.com/ru-ru/library/ms127415(v=vs.110).aspx

using Microsoft.VisualBasic; 
var quarter = DateAndTime.DatePart(DateInterval.Quarter, (DateTime)dateTimePickerDateTime.Value); 

Answer 4

 var date = new DateTime(2015, 3, 15); 

     var quarter = (date.Month + 2)/3; 

     var quarterStartMonth = 3 * quarter - 2; 

     var quarterStartDate = new DateTime(date.Year, quarterStartMonth, 1); 

Answer 5

一个较为简单的内胆采用现场演示here +按F8 运行。

var date = DateTime.Now; //Give you own DateTime 
int offset = 2, monthsInQtr = 3; 

var quarter = (date.Month + offset)/monthsInQtr; //To find which quarter 
var totalMonths = quarter * monthsInQtr; 

var startDateInQtr = new DateTime(date.Year, totalMonths - offset, 1); //start date in quarter 

如果您正在寻找在季度使用最后天DateTime.DaysInMonth

var endDateInQtr = new DateTime(date.Year, totalMonths, DateTime.DaysInMonth(date.Year, totalMonths));