How to find the first day of next month,if the current month is december

Question

I\'m using the following query to get the next month.

int theMonth = ((System.DateTime)periodStartDate).Month+1;

But if the periodstartDate

Answer 1

int theMonth = ((System.DateTime)periodStartDate).AddMonths(1).Month;

Answer 2

If you call AddMonths(1) then .NET will automatically roll the date into the next year.

periodStartDate.AddMonths(1).Month;

Answer 3

   DateTime now = DateTime.Now;
        DateTime nextMonth;
        if(now.Day > 1)
         nextMonth = now.AddDays(-(now.Day - 1)).AddMonths(1);
        else
         nextMonth = now.AddMonths(1);

Where Now is the Date you want to start ,you could replace with TheStartPeriod

Answer 4

The trick part is to understand the start date could not start in the first day of the current month, so a plain AddMonth could lead to undesired dates. Build a new DateTime in the day 01 and, then, add the month.

var firstDayNextMonth = new DateTime(startDate.Year, startDate.Month, 1).AddMonths(+1);

BTW, the AddMonths method documentation states:

The AddMonths method calculates the resulting month and year, taking into account leap years and the number of days in a month, then adjusts the day part of the resulting DateTime object. If the resulting day is not a valid day in the resulting month, the last valid day of the resulting month is used. For example, March 31st + 1 month = April 30th, and March 31st - 1 month = February 28 for a non-leap year and February 29 for a leap year.

Answer 5

I think you can get it in this fashion

DateTime dt = new DateTime(2011,12,2);
DateTime dayone = new DateTime(dt.AddMonths(1).Year, dt.AddMonths(1).Month, 1);

Now you have a proper DateTime object to the first of the next month, do as you please with it

Answer 6

The expression ((System.DateTime)periodStartDate).Month+1 doesn't throw an error if the month is December - it just returns 13. I suspect you're doing this:

var nextMonth = new DateTime(periodStartDate.Year, periodStartDate.Month + 1, 1);

That would throw an error.

Try this instead:

var nextMonth = new DateTime(periodStartDate.Year, periodStartDate.Month, 1)
    .AddMonths(1);