How to show date difference of 3 month

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I am devloping application in vb.net where i am using datepicker and want to restrict user not to select date which is less than 3 month from current date..not in terms of 90 days..in terms of month..
DateDiff(DateInterval.Month, dtpChequeDate.Value, Date.Now) > 3
but it gives me integer value i want float value so exactly month difference can calculated..

Posted 19-Jul-12 0:19am

vishal_h

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StianSandberg 19-Jul-12 6:21am

A float??. What is 3,4 months?

vishal_h 19-Jul-12 7:12am

I have added solution ..

2 solutions

Solution 1

You can write JavaScript method to calculate the number of months difference between two given dates as:

JavaScript

function monthDiff(d1, d2) {
    var months;
    months = (d2.getFullYear() - d1.getFullYear()) * 12;
    months -= d1.getMonth() + 1;
    months += d2.getMonth();
    return months;
}

Using this method, you can write your application logic as
monthDiff(dtpChequeDate.Value, Date.Now) > 3

Posted 19-Jul-12 0:24am

Ganesan Senthilvel

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StianSandberg 19-Jul-12 6:29am

this is not an answer to vishal_h's question. This is just a javascript version of his c# code.

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vishal_h · Accepted Answer · 2012-07-19T01:05:00

I write one function which calulate months diffenece and days difference ..
If month difference is 3 and days difference is greater than 0 then it is exactly more than 3 month..

Private Function IsDateValid(ByVal dtp As Date) As Boolean

       Dim d1, d2 As Date

       Dim days, months As Long
       d1 = dtp
       d2 = Now.ToShortDateString


           months = Month(d1)
           days = d1.Day


           months = Month(d2) - months
           days = d2.Day - days



           If Math.Sign(days) = -1 Then
               days = 30 - Math.Abs(days)
               months = months - 1
           End If

           If Math.Sign(months) = -1 Then
               months = 12 - Math.Abs(months)
           End If

           If ((months = 3 And days > 0) Or (months > 3)) Then
               Return False
           End If
           Return True
       End If

   End Function