Returns a new DateTime that adds the specified number of months to the value of this instance.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Parameters
- months
- Type: System.Int32
A number of months. The months parameter can be negative or positive.
Return Value
Type: System.DateTimeAn object whose value is the sum of the date and time represented by this instance and months.
| Exception | Condition |
|---|---|
| ArgumentOutOfRangeException | The resulting DateTime is less than MinValue or greater than MaxValue. -or- months is less than -120,000 or greater than 120,000. |
This method does not change the value of this DateTime object. Instead, it returns a new DateTime object whose value is the result of this operation.
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. The time-of-day part of the resulting DateTime object remains the same as this instance.
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
