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module isittime_m |
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|
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implicit none |
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|
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contains |
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|
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SUBROUTINE isittime(itau, date0, dt, freq, last_action, last_check, do_action) |
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|
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! This subroutine checks the time has come for a given action. |
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! This is computed from the current time-step(itau). |
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! Thus we need to have the time delta (dt), the frequency |
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! of the action (freq) and the last time it was done |
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! (last_action in units of itau). |
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! In order to extrapolate when will be the next check we need |
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! the time step of the last call (last_check). |
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|
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! The test is done on the following condition: |
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! the distance from the current time to the time for the next |
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! action is smaller than the one from the next expected |
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! check to the next action. |
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! When the test is done on the time steps simplifactions make |
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! it more difficult to read in the code. |
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! For the real time case it is easier to understand ! |
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|
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use calendar |
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use itau2date_m |
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use ju2ymds_m |
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use ymds2ju_m |
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|
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INTEGER, INTENT(IN):: itau |
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REAL, INTENT(IN):: date0 |
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REAL, INTENT(IN):: dt, freq |
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INTEGER, INTENT(IN):: last_action, last_check |
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LOGICAL, INTENT(OUT):: do_action |
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|
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REAL:: dt_action, dt_check |
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REAL:: date_last_act, date_next_check, date_next_act, & |
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& date_now, date_mp1, date_mpf |
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INTEGER:: year, month, monthp1, day, next_check_itau, next_act_itau |
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INTEGER:: yearp, dayp |
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REAL:: sec, secp |
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LOGICAL:: check = .FALSE. |
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!-------------------------------------------------------------------- |
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IF (check) THEN |
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WRITE(*, *) & |
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& "isittime 1.0 ", itau, date0, dt, freq, last_action, last_check |
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ENDIF |
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|
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IF (last_check >= 0) THEN |
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dt_action = (itau-last_action)*dt |
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dt_check = (itau-last_check)*dt |
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next_check_itau = itau+(itau-last_check) |
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|
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!- We are dealing with frequencies in seconds and thus operation |
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!- can be done on the time steps. |
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|
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IF (freq > 0) THEN |
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IF (ABS(dt_action-freq) <= ABS(dt_action+dt_check-freq)) THEN |
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do_action = .TRUE. |
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ELSE |
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do_action = .FALSE. |
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ENDIF |
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|
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!--- Here we deal with frequencies in month and work on julian days. |
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|
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ELSE |
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date_now = itau2date (itau, date0, dt) |
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date_last_act = itau2date (last_action, date0, dt) |
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CALL ju2ymds (date_last_act, year, month, day, sec) |
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monthp1 = month - freq |
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yearp = year |
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|
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!--- Here we compute what logically should be the next month |
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|
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IF (month >= 13) THEN |
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yearp = year+1 |
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monthp1 = monthp1-12 |
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ENDIF |
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CALL ymds2ju (year, monthp1, day, sec, date_mpf) |
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|
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!--- But it could be that because of a shorter month or a bad |
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!--- starting date that we end up further than we should be. |
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!--- Thus we compute the first day of the next month. |
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!--- We can not be beyond this date and if we are close |
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!--- then we will take it as it is better. |
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|
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monthp1 = month+ABS(freq) |
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yearp=year |
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IF (monthp1 >= 13) THEN |
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yearp = year+1 |
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monthp1 = monthp1 -12 |
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ENDIF |
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dayp = 1 |
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secp = 0.0 |
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CALL ymds2ju (yearp, monthp1, dayp, secp, date_mp1) |
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|
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!--- If date_mp1 is smaller than date_mpf or only less than 4 days |
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!--- larger then we take it. This needed to ensure that short month |
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!--- like February do not mess up the thing ! |
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|
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IF (date_mp1-date_mpf < 4.) THEN |
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date_next_act = date_mp1 |
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ELSE |
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date_next_act = date_mpf |
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ENDIF |
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date_next_check = itau2date (next_check_itau, date0, dt) |
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|
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!--- Transform the dates into time-steps for the needed precisions. |
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|
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next_act_itau = & |
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& last_action+INT((date_next_act-date_last_act)*(un_jour/dt)) |
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|
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IF ( ABS(itau-next_act_itau) & |
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& <= ABS( next_check_itau-next_act_itau)) THEN |
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do_action = .TRUE. |
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IF (check) THEN |
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WRITE(*, *) & |
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& 'ACT-TIME: itau, next_act_itau, next_check_itau: ', & |
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& itau, next_act_itau, next_check_itau |
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CALL ju2ymds (date_now, year, month, day, sec) |
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WRITE(*, *) 'ACT-TIME: y, m, d, s: ', year, month, day, sec |
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WRITE(*, *) & |
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& 'ACT-TIME: date_mp1, date_mpf: ', date_mp1, date_mpf |
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ENDIF |
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ELSE |
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do_action = .FALSE. |
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ENDIF |
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ENDIF |
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|
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IF (check) THEN |
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WRITE(*, *) "isittime 2.0 ", & |
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& date_next_check, date_next_act, ABS(dt_action-freq), & |
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& ABS(dt_action+dt_check-freq), dt_action, dt_check, & |
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& next_check_itau, do_action |
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ENDIF |
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ELSE |
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do_action=.FALSE. |
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ENDIF |
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|
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END SUBROUTINE isittime |
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|
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end module isittime_m |
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