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DateDiff problem on different servers

CJM
I have an ASP page that lists files and folders in a directory. I'm using a
cookie to record the last time this page was visited, and I intend to show
links that are created/modified from that date minus 30mins to the
present... eg effectively new and modified files:

If DateDiff("n", subfolder.DateL astModified, sLastVisit ) < 30 Then.... etc

On my test machine this mechanism works OK, but on the live server (Win2k,
IIS5) I get some funny behaviour.

I create a new folder, and run the page. The value this expression returns
on XP is 0 and on Win2K is 43200. Refreshing every minute...on XP the value
increases, 1,2,3 etc... On Win2k, it decreases, 43200,43199,431 98 etc....
Folders created days ago have values like 37415

The file list is similar:

If DateDiff("n", file.DateLastMo dified, sLastVisit ) < 30 Then etc....

On the Win2k m/c, a new file returns 43200 again...

Am I missing something?? Do the DateDiff functions behave differently on
different servers (ie different versions of IIS)?

Help!

Thanks

Chris


Bigger Code Snippet (some key settings are stored in an include file):

<%@ Language=VBScri pt %>
<%
Option Explicit
Response.Expire s = 0

Dim folderspec, fso, fold, subfolder, files, file, subfld
Dim sFilter, sStartFolder, sStartPath, sTitle, sContact
Dim aDirs, i, j , sLink
Dim sLastVisit, sCookie, sDateClass, sMaxDiff

'Read LastVisit cookie
sLastVisit = Request.Cookies .Item("QADocs") ("LastVisit" )
If sLastVisit = "" Then
'sLastVisit = FormatDateTime( Now(),VBShortDa te)
sLastVisit = Now()
End If

Response.Write sLastVisit
'Set/Update Cookie
'Response.Cooki es("sCookie")(" LastVisit") = FormatDateTime( Now(),
VBShortDate)
Response.Cookie s.Item("QADocs" )("LastVisit" ) = Now()

%>
<!-- #include file="config.as p" -->
<%

'Recover subfolder name if available
subfld = Request.Queryst ring("sub")
subfld = subfld & "/"

'create full folder path
folderspec = Replace(sStartP ath & subfld, "/", "\")

%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title><%=sTitl e%></title>
<link type='text/css' rel='stylesheet ' href='Quality.c ss'>
</head>
<body>
<div id='header'>
<h2><%=sTitle%> </h2>
</div>
<div id='outer'>
<p>Note: Files or folders that have been added or modified since your last
visit have their dates shown <span class="new">lik e this.</span></p>
<table id='tbls'>
<tr id="breadcrumbs ">
<td colspan="2">
<%

Response.Write "<a href='./quality.asp'>" & sStartFolder & "</a>"

aDirs = Split(subfld,"/")
For i = 1 to UBound(aDirs)
Response.Write " > <a href='"

sLink = ""
For j = 1 to i
sLink=sLink & "/" & aDirs(j)
Next
Response.Write "./quality.asp?sub =" & sLink

Response.Write "'>" & aDirs(i) & "</a>"
Next

%>
</td>
</tr>
<tr>
<td>
<!-- Folders table -->
<table class="fld">
<colgroup class="lhs" />
<colgroup class="rhs" />
<tr>
<td class="title">F older Name</td>
<td class="title">L ast Modified</td>
</tr>
<%

'Create FileSystemObjec t
Set fso = CreateObject("S cripting.FileSy stemObject")

'Loop through Folders
Set fold = fso.GetFolder(f olderspec)
for each subfolder in fold.subFolders
'ignore system or hidden folders - signified by "_"
If Left(subfolder. name,1) <> "_" Then
If DateDiff("n", subfolder.DateL astModified, sLastVisit ) < sMaxDiff Then
sDateClass = "new"
Else
sDateClass = ""
End if
%>
<tr>
<td><a class="folder"
href='quality.a sp?sub=<%=subfl d &
subfolder.name% >'><%=subfolder .name%>...</a></td>
<td
class="<%=sDate Class%>"><%=For matDateTime(sub folder.DateLast Modified,
VBShortDate)%>< %= "..." & DateDiff("n", subfolder.DateL astModified,
sLastVisit)%></td>
</tr>
<%
End if
next
%>
</table>
</td>
<td>
<!-- Files table -->
<table class="fil">
<colgroup class="lhs" />
<colgroup class="rhs" />
<tr>
<td class="title">F ile Name</td>
<td class="title">L ast Modified</td>
</tr>
<%
'Loop through Files
set files = fold.files
for each file in files
If Instr(1, sFilter, lcase(right(fil e.name,3))) Then
If DateDiff("n", file.DateLastMo dified, sLastVisit ) < sMaxDiff Then
sDateClass = "new"
Else
sDateClass = ""
End if
%>
<tr>
<td><a class="file" href='.<%=subfl d &
file.name%>'><% =file.name%></a></td>
<td
class="<%=sDate Class%>"><%=For matDateTime(fil e.DateLastModif ied,
VBShortDate)%>< %= "..." & DateDiff("n", file.DateLastMo dified,
sLastVisit )%></td>
</tr>
<%
End if
Next
%>

</table>
</td>
</tr>
</table>
</div>

<p>If you have any queries or you think this page is not functioning
correctly contact <%=sContact%> .</p>

</body>
</html>


Jul 19 '05 #1
4 4092
What does sLastVisit look like? This is one of the dangers of using
regional date formats, like dd/mm/yyyy or mm/dd/yyyy. When you run code
that relies on British format (dd/mm/yyyy) on a machine set up for US
English, you're going to get some funny behavior, for sure.

Wait until 2003-09-13, that's when code should start breaking on you. If
you want to fix it in the meantime, use an ISO standard date format instead
of a regional one.


"CJM" <cj*****@yahoo. co.uk> wrote in message
news:eW******** ******@TK2MSFTN GP09.phx.gbl...
I have an ASP page that lists files and folders in a directory. I'm using a cookie to record the last time this page was visited, and I intend to show
links that are created/modified from that date minus 30mins to the
present... eg effectively new and modified files:

If DateDiff("n", subfolder.DateL astModified, sLastVisit ) < 30 Then.... etc
On my test machine this mechanism works OK, but on the live server (Win2k,
IIS5) I get some funny behaviour.

I create a new folder, and run the page. The value this expression returns
on XP is 0 and on Win2K is 43200. Refreshing every minute...on XP the value increases, 1,2,3 etc... On Win2k, it decreases, 43200,43199,431 98 etc....
Folders created days ago have values like 37415

The file list is similar:

If DateDiff("n", file.DateLastMo dified, sLastVisit ) < 30 Then etc....

On the Win2k m/c, a new file returns 43200 again...

Am I missing something?? Do the DateDiff functions behave differently on
different servers (ie different versions of IIS)?

Help!

Thanks

Chris


Bigger Code Snippet (some key settings are stored in an include file):

<%@ Language=VBScri pt %>
<%
Option Explicit
Response.Expire s = 0

Dim folderspec, fso, fold, subfolder, files, file, subfld
Dim sFilter, sStartFolder, sStartPath, sTitle, sContact
Dim aDirs, i, j , sLink
Dim sLastVisit, sCookie, sDateClass, sMaxDiff

'Read LastVisit cookie
sLastVisit = Request.Cookies .Item("QADocs") ("LastVisit" )
If sLastVisit = "" Then
'sLastVisit = FormatDateTime( Now(),VBShortDa te)
sLastVisit = Now()
End If

Response.Write sLastVisit
'Set/Update Cookie
'Response.Cooki es("sCookie")(" LastVisit") = FormatDateTime( Now(),
VBShortDate)
Response.Cookie s.Item("QADocs" )("LastVisit" ) = Now()

%>
<!-- #include file="config.as p" -->
<%

'Recover subfolder name if available
subfld = Request.Queryst ring("sub")
subfld = subfld & "/"

'create full folder path
folderspec = Replace(sStartP ath & subfld, "/", "\")

%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title><%=sTitl e%></title>
<link type='text/css' rel='stylesheet ' href='Quality.c ss'>
</head>
<body>
<div id='header'>
<h2><%=sTitle%> </h2>
</div>
<div id='outer'>
<p>Note: Files or folders that have been added or modified since your last visit have their dates shown <span class="new">lik e this.</span></p>
<table id='tbls'>
<tr id="breadcrumbs ">
<td colspan="2">
<%

Response.Write "<a href='./quality.asp'>" & sStartFolder & "</a>"

aDirs = Split(subfld,"/")
For i = 1 to UBound(aDirs)
Response.Write " > <a href='"

sLink = ""
For j = 1 to i
sLink=sLink & "/" & aDirs(j)
Next
Response.Write "./quality.asp?sub =" & sLink

Response.Write "'>" & aDirs(i) & "</a>"
Next

%>
</td>
</tr>
<tr>
<td>
<!-- Folders table -->
<table class="fld">
<colgroup class="lhs" />
<colgroup class="rhs" />
<tr>
<td class="title">F older Name</td>
<td class="title">L ast Modified</td>
</tr>
<%

'Create FileSystemObjec t
Set fso = CreateObject("S cripting.FileSy stemObject")

'Loop through Folders
Set fold = fso.GetFolder(f olderspec)
for each subfolder in fold.subFolders
'ignore system or hidden folders - signified by "_"
If Left(subfolder. name,1) <> "_" Then
If DateDiff("n", subfolder.DateL astModified, sLastVisit ) < sMaxDiff Then sDateClass = "new"
Else
sDateClass = ""
End if
%>
<tr>
<td><a class="folder"
href='quality.a sp?sub=<%=subfl d &
subfolder.name% >'><%=subfolder .name%>...</a></td>
<td
class="<%=sDate Class%>"><%=For matDateTime(sub folder.DateLast Modified,
VBShortDate)%>< %= "..." & DateDiff("n", subfolder.DateL astModified,
sLastVisit)%></td>
</tr>
<%
End if
next
%>
</table>
</td>
<td>
<!-- Files table -->
<table class="fil">
<colgroup class="lhs" />
<colgroup class="rhs" />
<tr>
<td class="title">F ile Name</td>
<td class="title">L ast Modified</td>
</tr>
<%
'Loop through Files
set files = fold.files
for each file in files
If Instr(1, sFilter, lcase(right(fil e.name,3))) Then
If DateDiff("n", file.DateLastMo dified, sLastVisit ) < sMaxDiff Then
sDateClass = "new"
Else
sDateClass = ""
End if
%>
<tr>
<td><a class="file" href='.<%=subfl d &
file.name%>'><% =file.name%></a></td>
<td
class="<%=sDate Class%>"><%=For matDateTime(fil e.DateLastModif ied,
VBShortDate)%>< %= "..." & DateDiff("n", file.DateLastMo dified,
sLastVisit )%></td>
</tr>
<%
End if
Next
%>

</table>
</td>
</tr>
</table>
</div>

<p>If you have any queries or you think this page is not functioning
correctly contact <%=sContact%> .</p>

</body>
</html>

Jul 19 '05 #2
CJM
As ever, you are quite correct. I'll convert my dates to ISO format. Well,
I've already started actually.

However, I'm afraid this is a side issue. The problem remains.

Well I'm off on my hols for a week... I guess I'll pick this up again when I
get back....!

Cheers

Chris
"Aaron Bertrand - MVP" <aa***@TRASHasp faq.com> wrote in message
news:uc******** ******@TK2MSFTN GP10.phx.gbl...
What does sLastVisit look like? This is one of the dangers of using
regional date formats, like dd/mm/yyyy or mm/dd/yyyy. When you run code
that relies on British format (dd/mm/yyyy) on a machine set up for US
English, you're going to get some funny behavior, for sure.

Wait until 2003-09-13, that's when code should start breaking on you. If
you want to fix it in the meantime, use an ISO standard date format instead of a regional one.

Jul 19 '05 #3
Hi CJM,

I should say this is a weird issue. This kind of problem is seldom reported
before.

I tried the following code on my side.

---------fso.vbs-------
dim filespec
filespec = "Noname1.ht ml"

ShowFileAccessI nfo filespec

Function ShowFileAccessI nfo(filespec)
Dim fso, f, s
Set fso = CreateObject("S cripting.FileSy stemObject")
Set f = fso.GetFile(fil espec)
s = UCase(filespec) & "<BR>"
s = s & "Created: " & f.DateCreated & "<BR>"
s = s & "Last Accessed: " & f.DateLastAcces sed & "<BR>"
s = s & "Last Modified: " & f.DateLastModif ied

dim sLastVisit

sLastVisit = f.DateLastModif ied - 1 ' set the sLastVisit to one day
before Now.

WScript.Echo DateDiff("n", f.DateLastModif ied, sLastVisit )

'ShowFileAccess Info = s
End Function
--------------------------------

It works correctly on both Win2000 and WinXP. Please test my code on your
side. I certainly appreciate your time.

Best regards,

Jacob Yang
Microsoft Online Partner Support
<MCSD>
Get Secure! ¨C www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.

Jul 19 '05 #4
CJM
Jacob,

Thanks for your reply. Soirry for the delay, I've been away...

I tried your code and it appears to work fine on both XP and Win2K machines.

I'm going to follow Aarons advice and convert my dates to ISO format at the
system boundaries, and as part of this I'll revisit my code. If I'm still
suffering problems, I'll resubmit my query.

Thanks for your help.

Chris

"Jacob Yang [MSFT]" <ji***@online.m icrosoft.com> wrote in message
news:$S******** ******@cpmsftng xa06.phx.gbl...
Hi CJM,

I should say this is a weird issue. This kind of problem is seldom reported before.

I tried the following code on my side.

---------fso.vbs-------
dim filespec
filespec = "Noname1.ht ml"

ShowFileAccessI nfo filespec

Function ShowFileAccessI nfo(filespec)
Dim fso, f, s
Set fso = CreateObject("S cripting.FileSy stemObject")
Set f = fso.GetFile(fil espec)
s = UCase(filespec) & "<BR>"
s = s & "Created: " & f.DateCreated & "<BR>"
s = s & "Last Accessed: " & f.DateLastAcces sed & "<BR>"
s = s & "Last Modified: " & f.DateLastModif ied

dim sLastVisit

sLastVisit = f.DateLastModif ied - 1 ' set the sLastVisit to one day
before Now.

WScript.Echo DateDiff("n", f.DateLastModif ied, sLastVisit )

'ShowFileAccess Info = s
End Function
--------------------------------

It works correctly on both Win2000 and WinXP. Please test my code on your
side. I certainly appreciate your time.

Best regards,

Jacob Yang
Microsoft Online Partner Support
<MCSD>
Get Secure! ¨C www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.

Jul 19 '05 #5

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