DateTime.Subtract Method (DateTime)
Updated: May 2010
Subtracts the specified date and time from this instance.
Assembly: mscorlib (in mscorlib.dll)
'Declaration Public Function Subtract ( _ value As DateTime _ ) As TimeSpan 'Usage Dim instance As DateTime Dim value As DateTime Dim returnValue As TimeSpan returnValue = instance.Subtract(value)
If the date and time of the current instance is earlier than value, the method returns a TimeSpan object that represents a negative time span. That is, the value of all of its non-zero properties (such as Days or Ticks) is negative.
The method does not consider the value of the Kind property of the two DateTime values when performing the subtraction. Before subtracting DateTime objects, ensure that the objects represent times in the same time zone. Otherwise, the result will include the difference between time zones.
The DateTimeOffset.Subtract(DateTimeOffset) method does consider the difference between time zones when performing the subtraction.
The following example demonstrates the Subtract method and the subtraction operator.
Dim date1 As New System.DateTime(1996, 6, 3, 22, 15, 0) Dim date2 As New System.DateTime(1996, 12, 6, 13, 2, 0) Dim date3 As New System.DateTime(1996, 10, 12, 8, 42, 0) Dim diff1 As System.TimeSpan ' diff1 gets 185 days, 14 hours, and 47 minutes. diff1 = date2.Subtract(date1) Dim date4 As System.DateTime ' date4 gets 4/9/1996 5:55:00 PM. date4 = date3.Subtract(diff1) Dim diff2 As System.TimeSpan ' diff2 gets 55 days 4 hours and 20 minutes. diff2 = System.DateTime.op_Subtraction(date2, date3) Dim date5 As System.DateTime ' date5 gets 4/9/1996 5:55:00 PM. date5 = System.DateTime.op_Subtraction(date1, diff2)
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The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.