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DateTime.AddDays Method

July 28, 2014

Returns a new DateTime that adds the specified number of days to the value of this instance.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public DateTime AddDays(
	double value
)

Parameters

value
Type: System.Double
The number of whole and fractional days to add. This value can be positive or negative.

Return Value

Type: 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.

ExceptionCondition
ArgumentOutOfRangeException

The resulting DateTime is earlier than DateTime.MinValue or later than DateTime.MaxValue.

This method does not change the value of this DateTime. Instead, a new DateTime is returned whose value is the result of this operation.

The fractional part of value is 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.

The following example demonstrates the AddDays method.


// Calculate what day of the week is 36 days from this instant.
System.DateTime today = System.DateTime.Now;
System.DateTime answer = today.AddDays(36);
outputBlock.Text += String.Format("{0:dddd}", answer) + "\n";


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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