w3valdat.f

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      logical function w3valdat(idat)
      integer idat(8)
      real rinc1(5),rinc2(5)
      integer jdat(8)
! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
!  essentially move the date and time by a zero time interval
!  and see if the same date and time is returned
      rinc1(1)=0
      rinc1(2:5)=idat(5:8)
      call w3reddat(-1,rinc1,rinc2)
      jldayn=iw3jdn(idat(1),idat(2),idat(3))+nint(rinc2(1))
      call w3fs26(jldayn,jdat(1),jdat(2),jdat(3),jdow,jdoy)
!  the time zone is valid if it is in signed hhmm format
!  with hh between -23 and 23 and mm equal to 00 or 30
      jdat(4)=mod(idat(4)/100,24)*100+mod(mod(idat(4),100),60)/30*30
      jdat(5:8)=nint(rinc2(2:5))
      w3valdat=all(idat.eq.jdat)
! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      end