DateTime.AddDays Method (Double)
Returns a new DateTime that adds the specified number of days to the value of this instance.
Assembly: mscorlib (in mscorlib.dll)
A number of whole and fractional days. The value parameter can be negative or positive.
Return ValueType: System.DateTime
An object whose value is the sum of the date and time represented by this instance and the number of days represented by value.
The fractional part of valueis the fractional part of a day. For example, 4.5 is equivalent to 4 days, 12 hours, 0 minutes, 0 seconds, 0 milliseconds, and 0 ticks.
The value parameter is rounded to the nearest millisecond.
Themethod takes into account leap years and the number of days in a month when performing date arithmetic.
Available since 4.5
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Available since 8.1