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Date time syntax

Posted on 2011-03-02
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Last Modified: 2012-05-11
I am checking for a credit card related clause in vb.net code .Not sure how to check that,looking for syntax

'If  the credit card is there for 6 months more than the duedate in that table I need to remove the entry.'
I have a business object which holds all thefields for that table like (Card Expiration date,card create datetime)
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Question by:onebite2
7 Comments
 
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by:rawinnlnx9
ID: 35022348
 TimeSpan span = System.DateTime.Now.Subtract (cardcreatedate);

if (span.Days > 180)
{
//Call stored proc to remove data.
// I am assuming that cardcreatedate is the datetime that the entry for the card was made in the table.
}

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by:gamarrojgq
ID: 35022406
Hi,


You can use AddMonths to validate it, I am going to assume that when you said "CREDIT CARD IS THER FOR 6 MORE THAN DUEDATE" you mean Credit Card Expiration Date, and that both fields are Date Type, so it will be something like this

If CreditCardExpirationDateField >= DueDate.AddMonths(6) Then
   'Remove the Entry
End if
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wdosanjos earned 500 total points
ID: 35022456
Try this:

Dim ccIsThereDate As DateTime = #7/1/2010#
Dim dueDate As DateTime = #1/1/2011#

Console.WriteLine("Days {0}", (dueDate - ccIsThereDate).Days)

If (dueDate - ccIsThereDate).Days > 180 Then
   Console.WriteLine("The credit card is there for 6 months more than the duedate.")
End If

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Expert Comment

by:käµfm³d 👽
ID: 35022889
For rawinnlnx9 or wdosanjos' example, you would want to use TotalDays as opposed to Days.
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by:wdosanjos
ID: 35024085
@kaufmed, I think TotalDays would make sense if the calculation involves date and time.  If both variables represent just dates, Days should have the same effect.
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by:käµfm³d 👽
ID: 35026027
@wdosanjos

On second thought, I agree. It should have the same effect. I'm so used to working with the seconds/milliseconds members of TimeSpan that I just instinctively applied it here. After reviewing the documentation again, I see that, for the purposes of this question, Days and TotalDays would be equivalent.

The one "flaw" with this logic, though, is that there is an assumption of a flat 180 days equals six months. I think gamarrojgq's approach might be more appropriate here.
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by:wdosanjos
ID: 35027593
@kaufmed, I agree with your analysis.  @gamarrojgq approach is more flexible as it can address either requirements properly (180 days or 6 months).
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