Add and subtract datetime in .Net

Suppose that you have two date time values one is startdate and second is EndDate, and you want to calculate time interval between both dates ,in this situation we can use timespan object like this:

(According to MSDN:  A TimeSpan object represents a time interval (duration of time or elapsed time) that is measured as a positive or negative number of days, hours, minutes, seconds, and fractions of a second. The TimeSpan structure can also be used to represent the time of day, but only if the time is unrelated to a particular date. Otherwise, the DateTime or DateTimeOffset  structure should be used instead.)
before starting of code

VB.Net

        Dim StartTime As DateTime = #6/12/2008 3:09:00 PM#
        Dim EndTime As DateTime = #6/10/2008 12:04:00 PM#
        Dim TimeDiff As TimeSpan = EndTime.Subtract(StartTime)
        Dim Days As Integer = TimeDiff.ToatlDays         
                        'calculate Value of Days Component
        Dim Minutes As Integer = TimeDiff.TotalMinutes     
                        'calculate Value of Minutes Component
        Dim Seconds As Integer = TimeDiff.TotalSeconds   
                         'calculate Value of Seconds Component
        Dim TotalDays As Integer = TimeDiff.TotalDays    
                         'calculate Value of Total Days
        Dim TotalHours As Integer = TimeDiff.TotalHours 
                           'calculate Value of Total Minutes
        Dim TotalSeconds As Integer = TimeDiff.TotalSeconds
                           'calculate Value of Total Seconds

        we can use subtract method for calculating difference between two date like :

        TimeDiff = EndTime.Subtract(StartTime)
 

Add a day, a month and a year to a Date

 
            Dim FirstDate As Date
            Dim SecondDate As Date
           FirstDate = #2/28/2010#
            'Add a day
            SecondDate = FirstDate.AddDays(1)
            'Add some months
            SecondDate = FirstDate.AddMonths(6)
            'Subtract a year
            SecondDate = FirstDate.AddYears(-1)</blockquote>

[C#]

 
      DateTime StartTime = 12/06/2008 15:09:00;
DateTime EndTime = 10/06/2008 12:04:00;
TimeSpan TimeDiff = EndTime.Subtract(StartTime);
int Days = TimeDiff.ToatlDays;
//calculate Value of Days Component
int Minutes = TimeDiff.TotalMinutes;
//calculate Value of Minutes Component
int Seconds = TimeDiff.TotalSeconds;
//calculate Value of Seconds Component
int TotalDays = TimeDiff.TotalDays;
//calculate Value of Total Days
int TotalHours = TimeDiff.TotalHours;
//calculate Value of Total Minutes
int TotalSeconds = TimeDiff.TotalSeconds;
//calculate Value of Total Seconds
//we can use subtract method for calculating difference between two date like :
TimeDiff = EndTime.Subtract(StartTime);

Add a day, a month and a year to a Date

 
System.DateTime SecondDate = default(System.DateTime);
FirstDate = 28/02/2010 00:00:00;
//Add a day
SecondDate = FirstDate.AddDays(1);
//Add some months
SecondDate = FirstDate.AddMonths(6);
//Subtract a year
econdDate = FirstDate.AddYears(-1);
  • Madhu

    ThanQ Sir