Bewildering SAS input

bewildering_input.sas

data gnu ;
  input
    studyid         $char6.
    event_datetime  $char26.
    event_name      $char50.
  ;
  infile datalines   
    dsd
    delimiter = '09'x 
    firstobs  = 2 
    truncover
  ;
  x = input(event_datetime, anydtdtm.) ;
  y = input(event_datetime, e8601dt26.) ;
datalines ;
ZZ2002  2010-03-25T13:23:35-0400  AccessCodeAccepted
ZZ2002  2010-03-25T13:23:36-0400  ParticipantLoggedIn
ZZ2002  2010-03-25T13:23:36-0400  EligibilityStart
ZZ2002  2010-03-25T13:23:48-0400  PrescreenStart
ZZ2002  2010-03-25T13:23:51-0400  PrescreenComplete
ZZ2002  2010-03-25T13:23:51-0400  EligibilityStart
ZZ2002  2010-03-25T13:24:26-0400  AccountSetupStart
ZZ2002  2010-03-25T13:25:01-0400  ParticipantLoggedOut
ZZ2002  2010-03-25T13:25:06-0400  AccessCodeAccepted
ZZ2002  2010-03-25T13:25:06-0400  ParticipantLoggedIn
ZZ2002  2010-03-25T13:25:06-0400  EligibilityStart
ZZ2002  2010-03-25T13:25:11-0400  PrescreenStart
ZZ2002  2010-03-25T13:25:14-0400  PrescreenComplete
ZZ2002  2010-03-25T13:25:14-0400  EligibilityStart
;
run ;

proc print data = gnu (obs = 25) ;
run ;