Question

我的守则是:

DateTime startDate = Convert.ToDateTime( orderDate ).AddMonths(-1);
DateTime endDate = Convert.ToDateTime( orderDate );

命令日期是我通过的日期。

How do I always guarantee startDate is the first day of the previous month for orderDate? How do I always guarantee endDate is the last day of the month for orderDate?

例:

orderDate = 5/4/2012

I want startDate to be 4/1/2012 (or 04/1/2012 whichever is default)
I want endDate to be 4/30/2012

我怎么能够这样做?

Answer 1

DateTime startDate = Convert.ToDateTime( orderDate ).AddMonths(-1);
// set to first of month
startDate = startDate.AddDays(1-startDate.Day);

// Set end date to last of month, which is one day before first of next month
DateTime endDate = startDate.AddMonths(1).AddDays(-1);

Answer 2

origDate = startDate.AddMonths(-1);
DateTime myDate = new DateTime(origDate.Year, origDate.Month, 1);

...... 我们这样做往往足以使我们刚刚创立一种延期方法。

Answer 3

DateTime startDate = new DateTime( orderDate.Month == 1 ? orderDate.Year - 1 : orderDate.Year, orderDate.Month - 1, 1);
DateTime endDate = new DateTime(orderDate.Year, orderDate.Month, DateTime.DaysInMonth(orderDate.Year, OrderDate.Month));

Answer 4

使用时间构造者,每年、月、日、......采用不同的数值,并对数值进行调整(即月第一日为1日)。

Answer 5

var orderDate = DateTime.Now.Date;
var endDate = orderDate.AddDays(-orderDate.Day);
var startDate  = endDate.AddDays(-(endDate.Day - 1));

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