ESMF_TimeIntervalValidate Subroutine

      subroutine ESMF_TimeIntervalValidate(timeinterval, keywordEnforcer, rc)

! !ARGUMENTS:
      type(ESMF_TimeInterval), intent(in)            :: timeinterval
      type(ESMF_KeywordEnforcer), optional:: keywordEnforcer ! must use keywords below
      integer,                 intent(out), optional :: rc

!
! !STATUS:
! \begin{itemize}
! \item\apiStatusCompatibleVersion{5.2.0r}
! \end{itemize}
!
! !DESCRIPTION:
!     Checks whether a {\tt timeinterval} is valid.
!     If fractional value, denominator must be non-zero.
!
!     The arguments are:
!     \begin{description}
!     \item[timeinterval]
!          {\tt ESMF\_TimeInterval} to be validated.
!     \item[{[rc]}]
!          Return code; equals {\tt ESMF\_SUCCESS} if there are no errors.
!     \end{description}
!
!EOP
! !REQUIREMENTS:
!     TMGn.n.n
      integer :: localrc                        ! local return code
      character :: options ! dummy options

      ! Assume failure until success
      if (present(rc)) rc = ESMF_RC_NOT_IMPL
      localrc = ESMF_RC_NOT_IMPL
    
      ! check input
      ESMF_INIT_CHECK_SHALLOW_SHORT(ESMF_TimeIntervalGetInit,timeinterval,rc)

      ! invoke C to C++ entry point
      call c_ESMC_TimeIntervalValidate(timeinterval, options, localrc)
      if (ESMF_LogFoundError(localrc, ESMF_ERR_PASSTHRU, &
        ESMF_CONTEXT, rcToReturn=rc)) return

      ! Return success
      if (present(rc)) rc = ESMF_SUCCESS
      end subroutine ESMF_TimeIntervalValidate