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C $Header: /usr/local/gcmpack/MITgcm/pkg/cal/cal_addtime.F,v 1.2 2003/10/09 04:19:19 edhill Exp $ |
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C $Name: $ |
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|
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#include "CAL_OPTIONS.h" |
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|
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subroutine cal_AddTime( |
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I date, |
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I interval, |
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O added, |
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I mythid |
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& ) |
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|
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c ================================================================== |
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c SUBROUTINE cal_AddTime |
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c ================================================================== |
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c |
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c o Add a time interval either to a calendar date or to a time |
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c interval. |
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c |
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c started: Christian Eckert eckert@mit.edu 30-Jun-1999 |
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c |
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c changed: Christian Eckert eckert@mit.edu 29-Dec-1999 |
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c |
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c - restructured the original version in order to have a |
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c better interface to the MITgcmUV. |
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c |
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c Christian Eckert eckert@mit.edu 03-Feb-2000 |
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c |
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c - Introduced new routine and function names, cal_<NAME>, |
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c for verion 0.1.3. |
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c |
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c ralf.giering@fastopt.de 31-May-2000 |
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c datesecs was computed at wrong place (cph) |
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c |
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c menemenlis@jpl.nasa.gov 8-Oct-2003 |
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c speed-up computations for long integration interval |
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c |
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c ================================================================== |
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c SUBROUTINE cal_AddTime |
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c ================================================================== |
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|
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implicit none |
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|
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c == global variables == |
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|
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#include "cal.h" |
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|
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c == routine arguments == |
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|
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integer date(4) |
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integer interval(4) |
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integer added(4) |
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integer mythid |
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|
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c == local variables == |
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|
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integer intsecs |
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integer datesecs |
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integer nsecs |
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integer hhmmss |
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integer yi,mi,di,si,li,wi |
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integer ndays, ndays_left, days_in_year |
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integer date_1,date_2 |
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integer intv_1,intv_2 |
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integer fac |
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integer iday |
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integer switch |
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integer ndayssub |
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integer ierr |
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|
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c == external == |
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|
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integer cal_IsLeap |
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external cal_IsLeap |
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|
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c == end of interface == |
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|
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if (interval(4) .ne. -1) then |
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ierr = 601 |
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call cal_PrintError( ierr, mythid) |
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stop ' stopped in cal_AddTime.' |
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endif |
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|
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date_1 = 0 |
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date_2 = 0 |
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fac = 1 |
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|
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if (date(4) .eq. -1) then |
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if (date(1) .ge. 0) then |
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date_1 = date(1) |
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date_2 = date(2) |
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intv_1 = interval(1) |
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intv_2 = interval(2) |
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else |
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if (interval(1) .lt. 0) then |
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date_1 = -date(1) |
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date_2 = -date(2) |
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intv_1 = -interval(1) |
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intv_2 = -interval(2) |
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fac = -1 |
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else |
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date_1 = interval(1) |
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date_2 = interval(2) |
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intv_1 = date(1) |
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intv_2 = date(2) |
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fac = 1 |
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endif |
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endif |
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else |
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if (interval(1) .ge. 0) then |
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intv_1 = interval(1) |
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intv_2 = interval(2) |
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else |
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intv_1 = -interval(1) |
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intv_2 = -interval(2) |
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fac = -1 |
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endif |
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endif |
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|
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intsecs = fac*(intv_2/10000*secondsperhour + |
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& (mod(intv_2/100,100)*secondsperminute + |
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& mod(intv_2,100))) |
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|
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if (date(4) .eq. -1) then |
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datesecs = date_2/10000*secondsperhour + |
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& mod(date_2/100,100)*secondsperminute + |
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& mod(date_2,100) |
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date_1 = date_1 + intv_1 |
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nsecs = datesecs + intsecs |
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if ((date_1 .gt. 0) .and. |
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& (nsecs .lt. 0)) then |
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date_1 = date_1 - 1 |
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nsecs = nsecs + secondsperday |
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endif |
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nsecs = fac*nsecs |
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yi = 0 |
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mi = 0 |
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di = fac*date_1 |
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li = 0 |
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wi = -1 |
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else |
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call cal_ConvDate( date,yi,mi,di,si,li,wi,mythid ) |
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if ((interval(1) .ge. 0) .and. |
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& (interval(2) .ge. 0)) then |
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nsecs = si + intsecs |
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ndays = interval(1)+nsecs/secondsperday |
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nsecs = mod(nsecs,secondsperday) |
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|
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c This used to be called by exf_getffieldrec -> cal_GetDate |
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c and was very slow for a long integration interval. |
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c do iday = 1,ndays |
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c di = di + 1 |
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c if (di .gt. ndaymonth(mi,li)) then |
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c di = 1 |
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c mi = mi + 1 |
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c endif |
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c switch = (mi-1)/nmonthyear |
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c yi = yi + switch |
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c mi = mod(mi-1,nmonthyear)+1 |
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c if (switch .eq. 1) li = cal_IsLeap( yi, mythid ) |
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c enddo |
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|
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c First take care of February 29 |
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ndays_left=ndays |
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if ( mi.eq.2 .and. di.eq.29 .and. ndays_left.gt.1 ) then |
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mi = 3 |
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di = 1 |
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ndays_left = ndays_left - 1 |
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endif |
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|
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c Next compute year |
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days_in_year=365 |
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if ((mi.gt.2.and.cal_IsLeap(yi+1,mythid).eq.2).or. |
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& (mi.le.2.and.cal_IsLeap(yi,mythid).eq.2) ) |
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& days_in_year=366 |
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do while (ndays_left .ge. days_in_year) |
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ndays_left = ndays_left - days_in_year |
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yi = yi + 1 |
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days_in_year=365 |
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if ((mi.gt.2.and.cal_IsLeap(yi+1,mythid).eq.2).or. |
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& (mi.le.2.and.cal_IsLeap(yi,mythid).eq.2) ) |
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& days_in_year=366 |
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enddo |
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li = cal_IsLeap( yi, mythid ) |
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|
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c Finally compute day and month |
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do iday = 1,ndays_left |
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di = di + 1 |
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if (di .gt. ndaymonth(mi,li)) then |
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di = 1 |
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mi = mi + 1 |
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endif |
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switch = (mi-1)/nmonthyear |
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yi = yi + switch |
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mi = mod(mi-1,nmonthyear)+1 |
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if (switch .eq. 1) li = cal_IsLeap( yi, mythid ) |
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enddo |
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wi = mod(wi+ndays-1,7)+1 |
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|
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else |
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nsecs = si + intsecs |
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if (nsecs .ge. 0) then |
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ndayssub = intv_1 |
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else |
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nsecs = nsecs + secondsperday |
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ndayssub = intv_1 + 1 |
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endif |
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do iday = 1,ndayssub |
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di = di - 1 |
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if (di .eq. 0) then |
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mi = mod(mi+10,nmonthyear)+1 |
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switch = mi/nmonthyear |
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yi = yi - switch |
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if (switch .eq. 1) li = cal_IsLeap( yi, mythid ) |
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di = ndaymonth(mi,li) |
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endif |
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enddo |
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wi = mod(wi+6-mod(ndayssub,7),7)+1 |
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endif |
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endif |
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|
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c Convert to calendar format. |
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added(1) = yi*10000 + mi*100 + di |
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hhmmss = nsecs/secondsperminute |
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added(2) = hhmmss/minutesperhour*10000 + |
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& (mod(fac*hhmmss,minutesperhour)*100 + |
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& mod(fac*nsecs,secondsperminute))*fac |
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added(3) = li |
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added(4) = wi |
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|
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return |
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end |
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