Question

How to validate a credit card expiration date?

Asked by: katrina_mc

Hi,

I'm working on a form that has already been created for 2004 & updating it for 2005.  The previous web developer used the following code to validate the credit card expiration date form field.  I'm not sure what she was doing here, or if it will still be accurate for 2005.  Can anyone both explain to me what she was doing, tell me how to change it to be accurate for 2005, and possibly even offer a better way of validating the expiration date of a credit card?

This is the validation code:

<cfif Evaluate(DateCompare(CreateDate(Form.cardExpYear, Form.cardExpMonth, "01"), "2004-06-01") + DateCompare(CreateDate(Form.cardExpYear, Form.cardExpMonth, "20"), "2015-09-01"))>
      <cfset errorcount = errorcount + 1>
</cfif>

This is the form field:
                  <tr valign="top">
                        <td align="right"><B<cfif Evaluate(DateCompare(CreateDate(Form.cardExpYear, Form.cardExpMonth, "01"), "2005-08-01") + DateCompare(CreateDate(Form.cardExpYear, Form.cardExpMonth, "20"), "2014-09-01")) and formmode NEQ "initial" and form.payment_type NEQ "Check" AND Form.check3 NEQ ""> class="error"<cfelse> style="color: #request.bgcolor#"</cfif>>Expiration Date</b></td>
                        <td><select name="cardExpMonth" class="formField">
                        <cfloop index="i" from="1" to="12">
                        <option <cfif DateFormat(CreateDate(2005, i, 01), "mm") EQ form.cardexpmonth>selected </cfif>value="#DateFormat(CreateDate(2005, i, 01), "mm")#">#DateFormat(CreateDate(2005, i, 01), "MMMM")# (#DateFormat(CreateDate(2005, i, 01), "mm")#)</option>
                        </cfloop>
                        </select>            
                                    
                        <select name="cardExpYear" class="formField">
                        <cfloop index="i" from="05" to="14">
                        <option <cfif DateFormat(CreateDate(i, 01, 01), "yy") EQ form.cardexpyear>selected </cfif>value="#DateFormat(CreateDate(i, 01, 01), "yy")#">20#DateFormat(CreateDate(i, 01, 01), "yy")#</option>
                        </cfloop>
                        </select>
                        </td>
                  </tr>

Thanks,
Katrina

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Asked On
2005-05-27 at 06:48:27ID21438956
Tags

card

,

date

,

credit

,

expiration

,

validate

Topic

ColdFusion Application Server

Participating Experts
1
Points
500
Comments
1

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Answers

 

by: mrichmonPosted on 2005-05-27 at 09:07:43ID: 14096064

Not sure ehat was being done.  But really what you want is this which doesn't need to be updated per year:


<cfif Form.Exp_Month EQ "" OR Form.Exp_Year EQ "">
      <!--- Make sure that a month and year were entered --->
      <cfset ErrorMsg = ErrorMsg & "Expiration ">
<cfelseif DateCompare(CreateDate(Form.Exp_Year, Form.Exp_Month, (DaysInMonth(CreateDate(Form.Exp_Year, Form.Exp_Month, 1)))), Now()) IS -1>
      <!--- Compare Now with last day of month that card expires to find out if Card has expired --->
      <cfset ErrorMsg = ErrorMsg & "Expired ">
</cfif>

20120131-EE-VQP-002

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