Makes C-budget SetEndingMonthlyStates consistent

The subroutines for water and carbon are made consistent.

components/elm/src/biogeochem/CNPBudgetMod.F90

@@ -1193,8 +1193,7 @@ subroutine CBudget_SetEndingMonthlyStates(bounds, col_cs, grc_cs)
     type(gridcell_carbon_state), intent(inout) :: grc_cs
     !
     ! !LOCAL VARIABLES:
-    integer :: year_prev, month_prev, day_prev, sec_prev
-    integer :: year_curr, month_curr, day_curr, sec_curr
+    integer :: year, month, day, sec
     !-----------------------------------------------------------------------
 
     associate(                                                       &
@@ -1203,26 +1202,19 @@ subroutine CBudget_SetEndingMonthlyStates(bounds, col_cs, grc_cs)
          tcs_month_end_grc =>    grc_cs%tcs_month_end   & ! Output: [real(r8) (:)   ]  grid-level carbon mass at the ending of a month
          )
 
-      ! Get current and previous dates to determine if a new month started
-      call get_curr_date(year_curr, month_curr, day_curr, sec_curr);
-
-      ! If at the beginning of a simulation, save grid-level TCS based on
-      ! 'begcb' from the current time step
-      if ( day_curr == 1 .and. sec_curr == 0 .and. get_nstep() <= 1 ) then
-         call c2g( bounds, &
-              begcb(bounds%begc:bounds%endc), &
-              tcs_month_end_grc(bounds%begg:bounds%endg), &
-              c2l_scale_type= 'unity', l2g_scale_type='unity' )
-      endif
+      ! Get current dates to determine if a new month started
+      call get_curr_date(year, month, day, sec);
 
       ! If multiple steps into a simulation and the last time step was the
       ! end of a month, save grid-level TCS based on 'endcb' from the last
       ! time step
-      if (get_nstep() > 1 .and. day_curr == 1 .and. sec_curr == 0) then
+      if (get_nstep() > 1 .and. day == 1 .and. sec == 0) then
          call c2g( bounds, &
               endcb(bounds%begc:bounds%endc), &
               tcs_month_end_grc(bounds%begg:bounds%endg), &
               c2l_scale_type= 'unity', l2g_scale_type='unity' )
+      else
+         tcs_month_end_grc(bounds%begg:bounds%endg) = spval
       endif
 
     end associate