fnDateTime() is a function, not a variable.

Code:

$aAttributes = "Name", "whenChanged"
$sADsPath = "LDAP://ou=disabled users,dc=xxxxx,dc=com"
$strFilter = "(&(objectClass=User)(Name=*))"

$aResults = fnLDAPQuery($aAttributes,$sADsPath,$strFilter,"Name")
@ERROR " | " @SERROR ?

; For Next loop to enumerate through each row of data
For $r = 0 to Ubound($aResults)
$aResults[$r,0] ? ; Print the name attribute
fnDateTime($aResults[$r,1]) ? ; Convert the localized DateTime to KiXtart DateTime
?
Next