ESMF_ClockGetNextTime Subroutine

      subroutine ESMF_ClockGetNextTime(clock, nextTime, keywordEnforcer, &
        timeStep, rc)

! !ARGUMENTS:
      type(ESMF_Clock),        intent(in)            :: clock
      type(ESMF_Time),         intent(out)           :: nextTime
      type(ESMF_KeywordEnforcer), optional:: keywordEnforcer ! must use keywords below
      type(ESMF_TimeInterval), intent(in),  optional :: timeStep
      integer,                 intent(out), optional :: rc

!
! !STATUS:
! \begin{itemize}
! \item\apiStatusCompatibleVersion{5.2.0r}
! \end{itemize}
!
! !DESCRIPTION:
!     Calculates what the next time of the {\tt clock} will be, based on
!     the {\tt clock}'s current time step or an optionally passed-in
!     {\tt timeStep}.
!
!     The arguments are:
!     \begin{description}
!     \item[clock]
!          The object instance for which to get the next time.
!     \item[nextTime]
!          The resulting {\tt ESMF\_Clock}'s next time.
!     \item[{[timeStep]}]
!          The time step interval to use instead of the clock's.
!     \item[{[rc]}]
!          Return code; equals {\tt ESMF\_SUCCESS} if there are no errors.
!     \end{description}
!
!EOP
! !REQUIREMENTS:
!     TMGx.x, CCSM
      integer :: localrc                        ! local return code

      ! Assume failure until success
      if (present(rc)) rc = ESMF_RC_NOT_IMPL
      localrc = ESMF_RC_NOT_IMPL

      ! check inputs
      ESMF_INIT_CHECK_DEEP(ESMF_ClockGetInit,clock,rc)
      ESMF_INIT_CHECK_SHALLOW(ESMF_TimeIntervalGetInit,timeStep,rc)

      ! invoke C to C++ entry point
      call c_ESMC_ClockGetNextTime(clock, nextTime, timeStep, localrc)
      if (ESMF_LogFoundError(localrc, ESMF_ERR_PASSTHRU, &
        ESMF_CONTEXT, rcToReturn=rc)) return

      ! mark output as successfully initialized
      call ESMF_TimeInit(nextTime)

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