How do you find the last day of the month? [duplicate]

Answer 1

if you're interested in a custom code version:

var anyDt = DateTime.Now;
var lastDayOfMonth = anyDt.AddMonths(1).AddDays(anyDt.AddMonths(1).Day).Date;

or:

var anyDt = DateTime.Now;
var lastDayOfMonth = anyDt.AddDays(1-anyDt.Day).AddMonths(1).AddDays(-1).Date; 

or as a method:

DateTime LastDayInMonth(DateTime anyDt)
   { return anyDt.AddMonths(1).AddDays(anyDt.AddMonths(1).Day).Date; }

or as an extension method:

DateTime LastDayInMonth(DateTime this anyDt)
   { return anyDt.AddMonths(1).AddDays(anyDt.AddMonths(1).Day).Date; }