find the difference between dates in asp.net

Following code check the difference between dates and return the number of years as difference between two dates

Code:


Function testYear(ByVal inputDate, ByVal testDate, ByVal strDifference)
   
    Here we test using years (yyyy) , difference in years .
    strDifference = DateDiff("yyyy", testDate, inputDate)
    If strDifference < 18 Then
        Response.Write("Sorry you must be older than 18 years")
    Else
        Response.Write("Welcome ,you can enter this site.")
    End If
End Function
 

Also you can do it for number of days .

Code:


Function diffDays(ByVal inputDate, ByVal testDate, ByVal strDifference)
   
    'Here we test using years (yyyy)
    testDate = "11/12/2001"
    'here we show difference in days.
    strDifference = DateDiff("d", testDate, inputDate)
     
    
     print the difference in page.
    Response.Write(strDifference & " to date " & testDate)
    
End Function
 

You can use "h" for hour ,"m" for month ,"d" for day ,"yyyy" for year ,"s" for seconds ,"q" quarter ,"n" for minutes.

You can add a units of time to a specific date like the following

Code:

<% 
    Dim dateToday, dateAfterAdd
    dateToday = Date.Now
    Response.Write("current date is " & dateToday & "<br>")
     add 6 years to a date .
    dateAfterAdd = DateAdd("yyyy", 6, dateToday)
    Response.Write("After adding 6 Years<b> " & dateAfterAdd & "</b><br>")
%>
 

You can also get a part of date :

Code:


Dim d_mydate
d_mydate=Now
 Get the month part of my date .
Response.Write DatePart("m",d_mydate)
 

You can also format the date :

Code:


currDate=Now 
Response.Write "Date Formatted : "FormatDateTime(currDate,0)
 

the FormatDateTime function takes two parameters ( date ,index for type of format)
0 -> vbGeneralDate 3/14/2010 4:48:49 AM Date and Time
1-> vbLongDate Friday, April 14, 2010 Date in Long format
2->vbShortDate 2/12/2010 Date in m/d/yyyy
3->vbLongTime 1:13:11 AM Long Time
4->vbShortTime 10:00 Short Date