validate teh date

[lyealain]

how do i validate the date inserted from textbox to check whether that is follow the date requirement... i wrote this...

if not (isnumeric(inserteddate)) then
if isdate(inserteddate) then
inserteddate = DateDiff("S", "01/01/1970 00:00:00", inserteddate) else
response.write "Date Invalid"
exit function
end if
end if

but is never work!!!!!!!!!!!!!!!!!!!!!!!!!

[lyealain]

also ..if i get 2 dates from different textbox... how do i compare the date.. date A cannot be more than date B...