DateTime.AddSeconds Method

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

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

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


Public Function AddSeconds ( _
    value As Double _
) As DateTime
public DateTime AddSeconds(
    double value


  • value
    Type: System..::.Double
    The number of whole and fractional seconds 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 seconds represented by value.


Exception Condition

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 second. For example, 4.5 is equivalent to 4 seconds, 500 milliseconds, and 0 ticks.

The value parameter is rounded to the nearest millisecond.

Version Information

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0


Windows Phone

See Also


DateTime Structure

System Namespace