Hi,
The date is being formatted according to the user's regional settings (in
the control panel). If your users are in many countries, then this is the
correct behaviour; Dates entered by Australians would be automatically
interpreted as dd/mm/yyyy whilst dates entered by Americans would be
interpreted as mm/dd/yyyy.
This works very well if the user's control panel settings are correct. If
your users are all in one country, then you can make some assumptions about
the user's intentions, otherwise you cannot.
It is for this reason that most websites use drop-downs for they day and
month - it avoids any ambiguity.
If your users *are* all in one country (eg for an intranet application),
then you can extract the day and month using "Mid", and recombine them using
"DateSerial".
Of course, if the string to date conversion occurs on the server, then date
will be interpreted according to the regional settings on the server, as in
the following example "thispage.asp":
<% @language='VbScript' %>
<%
if Request.QueryString("MyDate").Count>0 then
sDate=Request.QueryString("MyDate")
sFormattedDate=FormatDateTime(sDate, vbShortDate)
else
sDate=""
sFormattedDate=""
end if
%>
<html>
<head>
<meta http-equiv="content-type"
content="text/html;charset=iso-8859-1">
<title>Test Page</title>
</head>
<body bgcolor="#ffffff">
<%
Response.write "<p>" & sDate & "</p>"
' Response.write "<p>" & sFormattedDate & "</p>"
%>
<form method="GET" action="thispage.asp" name="MyForm">
<input type="text" name="MyDate" size="24">
<p><input type="submit"></p>
</form>
</body>
</html>
...But I digress.
To answer your original question, which seemed to be about client-side code,
I present the following modified version of your code:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>New Page 1</title>
<meta name="GENERATOR" content="Microsoft FrontPage 6.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<script Language="VBScript">
'This example is culture-specific, and should not be used on
'sites that are intended to be used in countries whose date
'format is other than dd/mm/yyyy.
Function IsDigit(s)
'2004/10/12 ALH
'This function returns True, if the first character in s
'is a digit.
'ie, a character in the range "0".."9"
if asc(s)>=asc("0") and asc(s)<=asc("9") then
IsDigit = True
else
IsDigit = False
end if
End Function
Function ContainsOnlyDigits(s)
'2004/10/12 ALH
'This function returns True, if s contains only digits.
'ie, characters in the range "0".."9"
dim iPos
dim iLen
iLen=len(s)
for iPos = 1 to iLen
if not IsDigit(mid(s,iLen,1)) then
ContainsOnlyDigits = False
Exit Function
end if
next
ContainsOnlyDigits = True
End Function
Function LooksLikeADate(sDate)
'2004/10/12 ALH
'This function returns True, if sDate is
'in the format nn/nn/nnnnn. No futher checks are applied.
if (len(sDate)<>10) then
LooksLikeADate = False
else
if mid(sDate,3,1)="/" and mid(sDate,6,1)="/" then
if ContainsOnlyDigits(mid(sDate,1,2)) and
ContainsOnlyDigits(mid(sDate,4,2)) and ContainsOnlyDigits(mid(sDate,7,4))
then
LooksLikeADate = True
else
LooksLikeADate = False
end if
else
LooksLikeADate = False
end if
end if
End Function
Function DaysInMonth(iMonth,iYear)
'2004/10/12 ALH
'This function returns the number of days in a month.
'The year is necessary in order to account for leap years
'ASSUMPTIONS: This function uses the Gregorian calendar.
select case iMonth
case 2
if iYear mod 4 = 0 then
if iYear mod 100 = 0 then
if iYear mod 400 = 0 then
DaysInMonth = 29
else
DaysInMonth = 28
end if
else
DaysInMonth = 29
end if
else
DaysInMonth = 28
end if
case 4,6,9,11
DaysInMonth = 30
case else
DaysInMonth = 31
end select
End Function
Function BeforeGregorianCalendar(iYear,iMonth,iDay)
'2004/10/12 ALH
'This function returns true if the specified
'year, month, and day, represent a date which would
'pre-date the introduction of the Gregorian Calendar,
'on 15 October, 1582.
if iYear>1582 then
BeforeGregorianCalendar = False
elseif iYear<1582 then
BeforeGregorianCalendar = True
elseif iMonth>10 then
BeforeGregorianCalendar = False
elseif iMonth<10 then
BeforeGregorianCalendar = True
elseif iDay>=15 then
BeforeGregorianCalendar = False
else
BeforeGregorianCalendar = True
end if
End Function
Function DateFromDDMMYYYY(sDate)
'2004/10/12 ALH
'This function interprets a string as a date in the format
'DD/MM/YYYY, regardless of the user's regional settings.
'If the string cannot be interpreted in this way
'eg "14/24/1978", then the function will fail silently,
'and return Null.
'ASSUMPTIONS: sDate is in the format "nn/nn/nnnn".
Dim iYear
Dim iMonth
Dim iDay
Dim iResult
iYear = CInt(mid(sDate,7,4))
iMonth = CInt(mid(sDate,4,2))
iDay = CInt(mid(sDate,1,2))
if iDay>DaysInMonth(iMonth,iYear) then
DateFromDDMMYYYY = Null
elseif BeforeGregorianCalendar(iYear,iMonth,iDay) then
DateFromDDMMYYYY = Null
else
DateFromDDMMYYYY = DateSerial(iYear,iMonth,iDay)
end if
End Function
Function NameOfMonth(iMonth)
'2004/10/12 ALH
'This function returns the English name of a month of the year.
NameOfMonth = trim(mid("January February March April May June
July August SeptemberOctober November December ",9*(iMonth-1)+1,9))
End Function
Function ErrorMessageFromDDMMYYYY(sDate)
'2004/10/12 ALH
'This function returns an appropriate error message
'to explain why sDate cannot be interpreted as a valid date.
'ASSUMPTIONS: Validity of the date has already been checked
'by calling DateFromDDMMYYYY, and sDate is in the format
'"nn/nn/nnnn".
Dim iYear
Dim iMonth
Dim iDay
Dim iDaysInMonth
iYear = CInt(mid(sDate,7,4))
iMonth = CInt(mid(sDate,4,2))
iDay = CInt(mid(sDate,1,2))
if iMonth>12 or iMonth<1 then
ErrorMessageFromDDMMYYYY="Please enter a date in the format dd/mm/yyyy."
elseif BeforeGregorianCalendar(iYear,iMonth,iDay) then
ErrorMessageFromDDMMYYYY="Please enter a date on or after 15 October,
1582 (the beginning of the Gregorian Calendar)."
else
iDaysInMonth = DaysInMonth(iMonth,iYear)
if iDay = 29 and iMonth = 2 then
ErrorMessageFromDDMMYYYY=CStr(iYear) & " is not a leap year."
else
ErrorMessageFromDDMMYYYY="There are only " & iDaysInMonth & " days in "
& NameOfMonth(iMonth) & "."
end if
end if
End Function
Function DateToDDMMYYYY(w)
'2004/10/12 ALH
'This function formats a date using the format "dd/mm/yyyy"
'ASSUMPTIONS: Year is on or after the introduction of
'the Gregorian calendar, on 15 October 1582.
'NOTES: The Gregorian Calendar was not adopted in England,
' until 14 September 1752. Care should be taken in
' accepting dates earlier than this.
Dim sYear
Dim sMonth
Dim sDay
sYear = CStr(Year(w))
sMonth = CStr(Month(w))
sDay = CStr(Day(w))
if len(sMonth)=1 then
sMonth="0" & sMonth
end if
if len(sDay)=1 then
sDay="0" & sDay
end if
DateToDDMMYYYY = sDay & "/" & sMonth & "/" & sYear
End Function
Function ExaminationDate_onblur()
Set theForm = document.DriverCert
Dim strdtDate
Dim wDate
If ((theForm.ExaminationDate.value)<> "") Then
strdtDate = (theForm.ExaminationDate.value)
if Not LooksLikeADate(strdtDate) then
Alert "Please enter a date in the format dd/mm/yyyy."
Exit Function
end if
wDate = DateFromDDMMYYYY(strdtDate)
if isnull(wDate) then
Alert ErrorMessageFromDDMMYYYY(strdtDate)
Exit Function
end if
varDate = DateToDDMMYYYY(wDate)
theForm.CertificationExpiry.value = varDate
end if
end Function
</script>
</head>
<body>
<form method="POST" action="--WEBBOT-SELF--" name="DriverCert">
<!--webbot bot="SaveResults" U-File="_private/form_results.csv"
S-Format="TEXT/CSV" S-Label-Fields="TRUE" -->
<p align="center">Enter these test values notice with certain dates
month and day get reversed<br></p>
<table cellpadding="0" cellspacing="0" width="658" height="73">
<!-- MSTableType="layout" -->
<tr>
<td width="329" height="73" valign="top">date formats
dd/mm/yyyy<p>01/02/2003<br>02/02/2003<br>03/02/2003<br>04/02/2003<br>05/02/2
003<br>06/02/2003<br>07/02/2003<br>08/02/2003<br>09/02/2003<br>
10/02/2003<br>11/02/2003<br>12/02/2003<br>13/02/2003<br>14/02/2003</td>
<td width="329" height="73" valign="top">date formats
dd/mm/yyyy<p>01/12/2003<br>02/11/2003<br>03/10/2003<br>04/09/2003<br>05/08/2
003<br>06/07/2003<br>07/06/2003<br>08/05/2003<br>09/04/2003<br>
10/03/2003<br>11/02/2003<br>12/01/2003<br> </p>
<p> </td>
</tr>
</table>
<p> enter date here>><input type="text" name="ExaminationDate"
size="20">
click here to make onblur occure >><input type="text"
name="CertificationExpiry" size="20"> </p>
</form>
</body>
</html>
Of course, this example would be better if it were in JavaScript, but that's
a matter of opinion.
Adelle.
[Non-text portions of this message have been removed]
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