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Check if a date is valid

Check if a date is valid

<form method ="post" action="<%= Request.ServerVariables("SCRIPT_NAME") %>"> 
<input type ="text" name="date"><br> 
<input type="submit"> 
</form> 
<% 
Dim strDate , blnValid , dteDate 
If Request.ServerVariables("CONTENT_LENGTH") <>0 Then 
strDate = Trim(Request.Form("date")) 
If isDate(strDate) Then 
dteDate = CDate(strDate) 
blnValid = True 
Else 
Response.Write "You entered an invalid date" 
End If 
If blnValid = True Then 
Response.Write "The date you entered was " & dteDate 
End If 
End If 
%>