Hello everyone!<BR>I have this datevalue that I have used in my asp app.. It is in a calendar and is used to go to the next month in the calendar. I myself have win2000 and IIS 5, and everything has worked well.. now when I installed this in NT server and IIS 4 I get the err msg:<BR> "Microsoft VBScript runtime error '800a000d' <BR>Type mismatch: 'Datevalue' "<BR><BR> kk = DateAdd("m",-1,Datevalue( "1." & Request("nyky_kuu") & "." & Request("nyky_vuosi")))<BR><BR>Is there any compatibility problems between the IISs that causes this? As the page workes fine in my win 2000 environment.<BR>Please submit any thoughts on this....Help!