Hi Norbert,
 
It's hard to tell from just the two lines of code exactly what could be
going on here. Some things you could try:
 
1.  Call a "dump session" at the top of the page, immediately followed
by an "exit".  Verify that "selWoche" is of type "DATE".
2.  If "selWoche" is not defined in the session, your code will return
the error message you mentioned. 
3.  If "selWoche" is defined in the session, try explicitly casting it
as type date when you retrieve it: $datum:=Date(session{"selWoche"})
 
Maybe your session is getting lost between the two pages, or is timing
out. I'm running IE on a windows machine for these tests.
 
Good Luck,
- Clayton

Clayton L. Donahue
The Healthcare Management Council, Inc
PH: (781) 449-5287
[EMAIL PROTECTED]
www.hmccentral.com <http://www.hmccentral.com/> 

 
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