How to get the last day of a month?

Question

If i have this date 03/08/1980 and I need to find the last day of the month (08)

(the last day of 08 - is 31)

How can I do it ? (in C#)

Answer 1

  DateTime firstOfNextMonth = new DateTime(date.Year, date.Month, 1).AddMonths(1);
  DateTime lastOfThisMonth = firstOfNextMonth.AddDays(-1);

Answer 2

How about substracting a day from the 1st of next month ?

DateTime lastDay = new DateTime(MyDate.Year,MyDate.Month+1,1).AddDays(-1);

Edit: also, in case you need it to work for December too:

DateTime lastDay = new DateTime(MyDate.Year,MyDate.Month,1).AddMonths(1).AddDays(-1);

Answer 3

var lastDayOfMonth = DateTime.DaysInMonth(date.Year, date.Month);

Answer 4

I don't know C# but, if it turns out there's not a convenient API way to get it, one of the ways you can do so is by following the logic:

today -> +1 month -> set day of month to 1 -> -1 day

Of course, that assumes you have date math of that type.

Answer 5

The last day of the month you get like this, which returns 31:

DateTime.DaysInMonth(1980, 08);