C # obtain the last day of the month based on the year and month

Obtain the earliest and last days of a month. In the datetime class of C #, ready-made functions are provided. The following two simple functions are used:

Private datetimeGetfirstdayofmonth(INT year, int month)

{

// Have you ever seen a month starting from 1st? No

// Then, return it directly to the caller!

// A good programming habit is yoursCodeEasy to understand

Return convert. todatetime (Year. tostring () + "-" + month. tostring () + "-1 ");

} Collection of business accounts

private datetime getlastdayofmonth (INT year, int month)
{
// The key here is datetime. daysinmonth returns the number of days in a month
int days = datetime. daysinmonth (year, month);
return convert. todatetime (Year. tostring () + "-" + month. tostring () + "-" + days. tostring ();

}