First and Last Days

Question

User265788195 posted

I need to find the first and last day of the current month using C#?

Answer 1

User-1946294156 posted

There is not a definative way of doing this.  If you are looking for the weekday, then you can build the date, for example, New DateTime(year, month, 1) for the first day of the month.

Then for the last Day of the Month, New DateTime(year, month, DateTime.DaysInMonth(Year, Month).

Then you can do use the day of week function to get the day. 

Answer 2

User1178876220 posted

 DateTime dt = DateTime.Now;
        DateTime fd = Convert.ToDateTime(dt.Month + "/1/" + dt.Year);
        DateTime ld = Convert.ToDateTime(dt.Month + "/" + System.DateTime.DaysInMonth(dt.Year, dt.Month) + "/" + dt.Year);
        Response.Write(fd.DayOfWeek.ToString() + " " + ld.DayOfWeek.ToString());

Answer 3

User1888482730 posted

Here you go, let me know if its what you were looking for:

private DateTime FirstDayOfMonth(DateTime dt){
            return new DateTime(dt.Year, dt.Month, 1);
        }

        private DateTime LastDayOfMonth(DateTime dt) {
            return FirstDayOfMonth(dt).AddMonths(1).AddDays(-1);
        }

Answer 4

User-1673382244 posted

In this code we can get current month last date and first date , using C#.Net

DateTime firstDay= new DateTime(DateTime.Now.Year, DateTime.Now.Month, 1);

 int DaysinMonth = DateTime.DaysInMonth(DateTime.Now.Year, DateTime.Now.Month)-1;

DateTime lastDay = firstDay.AddDays(DaysinMonth);

Answer 5

User3690988 posted

This is in VB, but it will return the first and last second of the month.

    ' DATEADD(ms, -5, DATEADD(mm, DATEDIFF(m, 0, GETDATE()) + 1, 0))  - Taken from a T-SQL query to find last second of the month

    DATEDIF = DateDiff(DateInterval.Month, #1/1/1900#, DateTime.Now)
    firstDay = DateAdd(DateInterval.Month, DATEDIF, #1/1/1900#)
    lastDay = DateAdd(DateInterval.Month, DATEDIF + 1, #1/1/1900#).AddMilliseconds(-1)
    Label1.Text = firstDay.ToString & " - " & lastDay.ToString

The label will print 10/1/2011 12:00:00 AM - 10/31/2011 11:59:59 PM

Untested, converted c# code:

DateTime firstDay = default(DateTime);
DateTime lastDay = default(DateTime);
long DATEDIF = 0;
DATEDIF = DateDiff(DateInterval.Month, 1/1/1900 12:00:00 AM, DateTime.Now);
firstDay = DateAdd(DateInterval.Month, DATEDIF, 1/1/1900 12:00:00 AM);
lastDay = DateAdd(DateInterval.Month, DATEDIF + 1, 1/1/1900 12:00:00 AM).AddMilliseconds(-1);
Label1.Text = firstDay.ToString + " - " + lastDay.ToString;