C $Header: /u/gcmpack/MITgcm/pkg/chronos/chronos.F,v 1.1 2004/07/28 01:26:03 molod Exp $ C $Name: $ #include "PACKAGES_CONFIG.h" #include "CPP_OPTIONS.h" subroutine set_alarm (tag,date,time,freq) C*********************************************************************** C Purpose C ------- C Utility to Set Internal Alarms C C Argument Description C -------------------- C tag ....... Character String Tagging Alarm Process C date ...... Begining Date for Alarm C time ...... Begining Time for Alarm C freq ...... Repeating Frequency Interval for Alarm C C*********************************************************************** implicit none character*(*) tag integer freq,date,time #ifdef ALLOW_USE_MPI #include "SIZE.h" #include "EEPARAMS.h" #include "EESUPPORT.h" #endif #include "chronos.h" #ifdef ALLOW_USE_MPI c MPI Utilities c ------------- #include "mpif.h" integer mpi_comm_model,ierror #endif integer myid logical first,set data first /.true./ integer n #ifdef ALLOW_USE_MPI call mpi_comm_rank ( mpi_comm_model,myid,ierror ) #else myid = 1 #endif if(first) then ntags = 1 tags(1) = tag freqs(1) = freq dates(1) = date times(1) = time if( myid.eq.1 ) write(6,100) date,time,freq,tags(1) else set = .false. do n=1,ntags if(tag.eq.tags(n)) then if( myid.eq.1 ) then print *, 'Warning! Alarm has already been set for Tag: ',tag print *, 'Changing Alarm Information:' print *, 'Frequency: ',freqs(n),' (Old) ',freq,' (New)' print *, ' Date0: ',dates(n),' (Old) ',date,' (New)' print *, ' Time0: ',times(n),' (Old) ',time,' (New)' endif freqs(n) = freq dates(n) = date times(n) = time set = .true. endif enddo if(.not.set) then ntags = ntags+1 if(ntags.gt.maxtag ) then if( myid.eq.1 ) then print *, 'Too many Alarms are Set!!' print *, 'Maximum Number of Alarms = ',maxtag endif call my_finalize call my_exit (101) endif tags(ntags) = tag freqs(ntags) = freq dates(ntags) = date times(ntags) = time if( myid.eq.1 ) write(6,100) date,time,freq,tags(ntags) endif endif first = .false. 100 format(1x,'Setting Alarm for: ',i8,2x,i6.6,', with frequency: ', . i8,', and Tag: ',a80) return end subroutine get_alarm (tag,date,time,freq,tleft) C*********************************************************************** C Purpose C ------- C Utility to Get Internal Alarm Information C C Input C ----- C tag ....... Character String Tagging Alarm Process C C Output C ------ C date ...... Begining Date for Alarm C time ...... Begining Time for Alarm C freq ...... Frequency Interval for Alarm C tleft ..... Time Remaining (seconds) before Alarm is TRUE C C*********************************************************************** implicit none character*(*) tag integer freq,date,time,tleft #ifdef ALLOW_USE_MPI #include "SIZE.h" #include "EEPARAMS.h" #include "EESUPPORT.h" #endif #include "chronos.h" #ifdef ALLOW_USE_MPI c MPI Utilities c ------------- #include "mpif.h" integer mpi_comm_model,ierror #endif logical set,alarm external alarm integer myid,n,nalarm,nsecf #ifdef ALLOW_USE_MPI call mpi_comm_rank ( mpi_comm_model,myid,ierror ) #else myid = 1 #endif set = .false. do n=1,ntags if(tag.eq.tags(n)) then freq = freqs(n) date = dates(n) time = times(n) if( alarm(tag) ) then tleft = 0 else call get_time (nymd,nhms) tleft = nsecf(freq) - nalarm(freq,nymd,nhms,date,time ) endif set = .true. endif enddo if(.not.set) then if( myid.eq.1 ) print *, 'Alarm has not been set for Tag: ',tag freq = 0 date = 0 time = 0 tleft = 0 endif return end function alarm (tag) implicit none character*(*) tag integer date,time logical alarm #include "chronos.h" integer n,modalarm,nalarm,freq,date0,time0 modalarm(freq,date0,time0) = nalarm (freq,date,time,date0,time0 ) call get_time (date,time) alarm = .false. do n=1,ntags if( tags(n).eq.tag ) then if( freqs(n).eq.0 ) then alarm = (dates(n).eq.date) .and. (times(n).eq.time) else alarm = ( date.gt.dates(n) .or. . (date.eq.dates(n) .and. time.ge.times(n)) ) .and. . modalarm( freqs(n),dates(n),times(n) ).eq.0 endif endif enddo return end subroutine set_time (date,time) implicit none integer date,time #ifdef ALLOW_USE_MPI #include "SIZE.h" #include "EEPARAMS.h" #include "EESUPPORT.h" #endif #include "chronos.h" #ifdef ALLOW_USE_MPI c MPI Utilities c ------------- #include "mpif.h" integer mpi_comm_model,ierror #endif integer myid #ifdef ALLOW_USE_MPI call mpi_comm_rank ( mpi_comm_model,myid,ierror ) #else myid = 1 #endif if( myid.eq.1 ) then print *, 'Setting Clock' print *, 'Date: ',date print *, 'Time: ',time endif nymd = date nhms = time return end subroutine get_time (date,time) implicit none integer date,time #include "chronos.h" date = nymd time = nhms return end function nsecf (nhms) C*********************************************************************** C Purpose C Converts NHMS format to Total Seconds C C*********************************************************************** implicit none integer nhms, nsecf nsecf = nhms/10000*3600 + mod(nhms,10000)/100*60 + mod(nhms,100) return end function nhmsf (nsec) C*********************************************************************** C Purpose C Converts Total Seconds to NHMS format C C*********************************************************************** implicit none integer nhmsf, nsec nhmsf = nsec/3600*10000 + mod(nsec,3600)/60*100 + mod(nsec,60) return end function nsecf2 (nhhmmss,nmmdd,nymd) C*********************************************************************** C Purpose C Computes the Total Number of seconds from NYMD using NHHMMSS & NMMDD C C Arguments Description C NHHMMSS IntervaL Frequency (HHMMSS) C NMMDD Interval Frequency (MMDD) C NYMD Current Date (YYMMDD) C C NOTE: C IF (NMMDD.ne.0), THEN HOUR FREQUENCY HH MUST BE < 24 C C*********************************************************************** implicit none integer nsecf2,nhhmmss,nmmdd,nymd INTEGER NSDAY, NCYCLE PARAMETER ( NSDAY = 86400 ) PARAMETER ( NCYCLE = 1461*24*3600 ) INTEGER YEAR, MONTH, DAY INTEGER MNDY(12,4) DATA MNDY /0,31,60,91,121,152,182,213,244,274,305,335,366, . 397,34*0 / integer nsecf,i,nsegm,nsegd,iday,iday2,nday C*********************************************************************** C* COMPUTE # OF SECONDS FROM NHHMMSS * C*********************************************************************** nsecf2 = nsecf( nhhmmss ) if( nmmdd.eq.0 ) return C*********************************************************************** C* COMPUTE # OF DAYS IN A 4-YEAR CYCLE * C*********************************************************************** DO I=15,48 MNDY(I,1) = MNDY(I-12,1) + 365 ENDDO C*********************************************************************** C* COMPUTE # OF SECONDS FROM NMMDD * C*********************************************************************** nsegm = nmmdd/100 nsegd = mod(nmmdd,100) YEAR = NYMD / 10000 MONTH = MOD(NYMD,10000) / 100 DAY = MOD(NYMD,100) IDAY = MNDY( MONTH ,MOD(YEAR ,4)+1 ) month = month + nsegm If( month.gt.12 ) then month = month - 12 year = year + 1 endif IDAY2 = MNDY( MONTH ,MOD(YEAR ,4)+1 ) nday = iday2-iday if(nday.lt.0) nday = nday + 1461 nday = nday + nsegd nsecf2 = nsecf2 + nday*nsday return end subroutine fixdate (nymd) implicit none integer nymd c Modify 6-digit YYMMDD for dates between 1950-2050 c ------------------------------------------------- if (nymd .lt. 500101) then nymd = 20000000 + nymd else if (nymd .le. 991231) then nymd = 19000000 + nymd endif return end subroutine interp_time ( nymd ,nhms , . nymd1,nhms1, nymd2,nhms2, fac1,fac2 ) C*********************************************************************** C C PURPOSE: C ======== C Compute interpolation factors, fac1 & fac2, to be used in the C calculation of the instantanious boundary conditions, ie: C C q(i,j) = fac1*q1(i,j) + fac2*q2(i,j) C where: C q(i,j) => Boundary Data valid at (nymd , nhms ) C q1(i,j) => Boundary Data centered at (nymd1 , nhms1) C q2(i,j) => Boundary Data centered at (nymd2 , nhms2) C C INPUT: C ====== C nymd : Date (yymmdd) of Current Timestep C nhms : Time (hhmmss) of Current Timestep C nymd1 : Date (yymmdd) of Boundary Data 1 C nhms1 : Time (hhmmss) of Boundary Data 1 C nymd2 : Date (yymmdd) of Boundary Data 2 C nhms2 : Time (hhmmss) of Boundary Data 2 C C OUTPUT: C ======= C fac1 : Interpolation factor for Boundary Data 1 C fac2 : Interpolation factor for Boundary Data 2 C C C*********************************************************************** implicit none integer nhms,nymd,nhms1,nymd1,nhms2,nymd2 _RL fac1,fac2 INTEGER YEAR , MONTH , DAY , SEC INTEGER YEAR1, MONTH1, DAY1, SEC1 INTEGER YEAR2, MONTH2, DAY2, SEC2 _RL time, time1, time2 INTEGER DAYSCY PARAMETER (DAYSCY = 365*4+1) INTEGER MNDY(12,4) LOGICAL FIRST DATA FIRST/.TRUE./ DATA MNDY /0,31,60,91,121,152,182,213,244,274,305,335,366, . 397,34*0 / integer i,nsecf C*********************************************************************** C* SET TIME BOUNDARIES * C*********************************************************************** YEAR = NYMD / 10000 MONTH = MOD(NYMD,10000) / 100 DAY = MOD(NYMD,100) SEC = NSECF(NHMS) YEAR1 = NYMD1 / 10000 MONTH1 = MOD(NYMD1,10000) / 100 DAY1 = MOD(NYMD1,100) SEC1 = NSECF(NHMS1) YEAR2 = NYMD2 / 10000 MONTH2 = MOD(NYMD2,10000) / 100 DAY2 = MOD(NYMD2,100) SEC2 = NSECF(NHMS2) C*********************************************************************** C* COMPUTE DAYS IN 4-YEAR CYCLE * C*********************************************************************** IF(FIRST) THEN DO I=15,48 MNDY(I,1) = MNDY(I-12,1) + 365 ENDDO FIRST=.FALSE. ENDIF C*********************************************************************** C* COMPUTE INTERPOLATION FACTORS * C*********************************************************************** time = DAY + MNDY(MONTH ,MOD(YEAR ,4)+1) + float(sec )/86400. time1 = DAY1 + MNDY(MONTH1,MOD(YEAR1,4)+1) + float(sec1)/86400. time2 = DAY2 + MNDY(MONTH2,MOD(YEAR2,4)+1) + float(sec2)/86400. if( time .lt.time1 ) time = time + dayscy if( time2.lt.time1 ) time2 = time2 + dayscy fac1 = (time2-time)/(time2-time1) fac2 = (time-time1)/(time2-time1) RETURN END subroutine tick (nymd,nhms,ndt) C*********************************************************************** C Purpose C Tick the Date (nymd) and Time (nhms) by NDT (seconds) C C*********************************************************************** implicit none integer nymd,nhms,ndt integer nsec,nsecf,incymd,nhmsf IF(NDT.NE.0) THEN NSEC = NSECF(NHMS) + NDT IF (NSEC.GT.86400) THEN DO WHILE (NSEC.GT.86400) NSEC = NSEC - 86400 NYMD = INCYMD (NYMD,1) ENDDO ENDIF IF (NSEC.EQ.86400) THEN NSEC = 0 NYMD = INCYMD (NYMD,1) ENDIF IF (NSEC.LT.00000) THEN DO WHILE (NSEC.LT.0) NSEC = 86400 + NSEC NYMD = INCYMD (NYMD,-1) ENDDO ENDIF NHMS = NHMSF (NSEC) ENDIF RETURN END subroutine tic_time (mymd,mhms,ndt) C*********************************************************************** C PURPOSE C Tick the Clock by NDT (seconds) C C*********************************************************************** implicit none #include "chronos.h" integer mymd,mhms,ndt integer nsec,nsecf,incymd,nhmsf IF(NDT.NE.0) THEN NSEC = NSECF(NHMS) + NDT IF (NSEC.GT.86400) THEN DO WHILE (NSEC.GT.86400) NSEC = NSEC - 86400 NYMD = INCYMD (NYMD,1) ENDDO ENDIF IF (NSEC.EQ.86400) THEN NSEC = 0 NYMD = INCYMD (NYMD,1) ENDIF IF (NSEC.LT.00000) THEN DO WHILE (NSEC.LT.0) NSEC = 86400 + NSEC NYMD = INCYMD (NYMD,-1) ENDDO ENDIF NHMS = NHMSF (NSEC) ENDIF c Pass Back Current Updated Time c ------------------------------ mymd = nymd mhms = nhms RETURN END FUNCTION NALARM (MHMS,NYMD,NHMS,NYMD0,NHMS0) C*********************************************************************** C PURPOSE C COMPUTES MODULO-FRACTION BETWEEN MHHS AND TOTAL TIME C USAGE C ARGUMENTS DESCRIPTION C MHMS INTERVAL FREQUENCY (HHMMSS) C NYMD CURRENT YYMMDD C NHMS CURRENT HHMMSS C NYMD0 BEGINNING YYMMDD C NHMS0 BEGINNING HHMMSS C C*********************************************************************** implicit none integer nalarm,MHMS,NYMD,NHMS,NYMD0,NHMS0 integer nsday, ncycle PARAMETER ( NSDAY = 86400 ) PARAMETER ( NCYCLE = 1461*24*3600 ) INTEGER YEAR, MONTH, DAY, SEC, YEAR0, MONTH0, DAY0, SEC0 integer MNDY(12,4) DATA MNDY /0,31,60,91,121,152,182,213,244,274,305,335,366, . 397,34*0 / integer i,nsecf,iday,iday0,nsec,nsec0,ntime C*********************************************************************** C* COMPUTE # OF DAYS IN A 4-YEAR CYCLE * C*********************************************************************** DO I=15,48 MNDY(I,1) = MNDY(I-12,1) + 365 ENDDO C*********************************************************************** C* SET CURRENT AND BEGINNING TIMES * C*********************************************************************** YEAR = NYMD / 10000 MONTH = MOD(NYMD,10000) / 100 DAY = MOD(NYMD,100) SEC = NSECF(NHMS) YEAR0 = NYMD0 / 10000 MONTH0 = MOD(NYMD0,10000) / 100 DAY0 = MOD(NYMD0,100) SEC0 = NSECF(NHMS0) C*********************************************************************** C* COMPUTE POSITIONS IN CYCLE FOR CURRENT AND BEGINNING TIMES * C*********************************************************************** IDAY = (DAY -1) + MNDY( MONTH ,MOD(YEAR ,4)+1 ) IDAY0 = (DAY0-1) + MNDY( MONTH0,MOD(YEAR0,4)+1 ) NSEC = IDAY *NSDAY + SEC NSEC0 = IDAY0*NSDAY + SEC0 NTIME = NSEC-NSEC0 IF (NTIME.LT.0 ) NTIME = NTIME + NCYCLE NALARM = NTIME IF ( MHMS.NE.0 ) NALARM = MOD( NALARM,NSECF(MHMS) ) RETURN END FUNCTION INCYMD (NYMD,M) C*********************************************************************** C PURPOSE C INCYMD: NYMD CHANGED BY ONE DAY C MODYMD: NYMD CONVERTED TO JULIAN DATE C DESCRIPTION OF PARAMETERS C NYMD CURRENT DATE IN YYMMDD FORMAT C M +/- 1 (DAY ADJUSTMENT) C C*********************************************************************** implicit none integer incymd,nymd,m integer ny,nm,nd,ny00,modymd INTEGER NDPM(12) DATA NDPM /31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31/ LOGICAL LEAP DATA NY00 /1900 / LEAP(NY) = MOD(NY,4).EQ.0 .AND. (NY.NE.0 .OR. MOD(NY00,400).EQ.0) C*********************************************************************** C NY = NYMD / 10000 NM = MOD(NYMD,10000) / 100 ND = MOD(NYMD,100) + M IF (ND.EQ.0) THEN NM = NM - 1 IF (NM.EQ.0) THEN NM = 12 NY = NY - 1 ENDIF ND = NDPM(NM) IF (NM.EQ.2 .AND. LEAP(NY)) ND = 29 ENDIF IF (ND.EQ.29 .AND. NM.EQ.2 .AND. LEAP(NY)) GO TO 20 IF (ND.GT.NDPM(NM)) THEN ND = 1 NM = NM + 1 IF (NM.GT.12) THEN NM = 1 NY = NY + 1 ENDIF ENDIF 20 CONTINUE INCYMD = NY*10000 + NM*100 + ND RETURN C*********************************************************************** C E N T R Y M O D Y M D C*********************************************************************** ENTRY MODYMD (NYMD) NY = NYMD / 10000 NM = MOD(NYMD,10000) / 100 ND = MOD(NYMD,100) 40 CONTINUE IF (NM.LE.1) GO TO 60 NM = NM - 1 ND = ND + NDPM(NM) IF (NM.EQ.2 .AND. LEAP(NY)) ND = ND + 1 GO TO 40 60 CONTINUE MODYMD = ND RETURN END SUBROUTINE ASTRO ( NYMD,NHMS,ALAT,ALON,IRUN,COSZ,RA ) C*********************************************************************** C C INPUT: C ====== C NYMD : CURRENT YYMMDD C NHMS : CURRENT HHMMSS C ALAT(IRUN):LATITUDES IN DEGREES. C ALON(IRUN):LONGITUDES IN DEGREES. (0 = GREENWICH, + = EAST). C IRUN : # OF POINTS TO CALCULATE C C OUTPUT: C ======= C COSZ(IRUN) : COSINE OF ZENITH ANGLE. C RA : EARTH-SUN DISTANCE IN UNITS OF C THE ORBITS SEMI-MAJOR AXIS. C C NOTE: C ===== C THE INSOLATION AT THE TOP OF THE ATMOSPHERE IS: C C S(I) = (SOLAR CONSTANT)*(1/RA**2)*COSZ(I), C C WHERE: C RA AND COSZ(I) ARE THE TWO OUTPUTS OF THIS SUBROUTINE. C C*********************************************************************** implicit none c Input Variables c --------------- integer nymd, nhms, irun _RL cosz(irun), alat(irun), alon(irun), ra c Local Variables c --------------- integer year, day, sec, month, iday, idayp1 integer dayscy integer i,nsecf,k,km,kp _RL hc _RL pi, zero, one, two, six, dg2rd, yrlen, eqnx, ob, ecc, per _RL daylen, fac, thm, thp, thnow, zs, zc, sj, cj parameter ( pi = 3.1415926535898) parameter ( zero = 0.0 ) parameter ( one = 1.0 ) parameter ( two = 2.0 ) parameter ( six = 6.0 ) parameter ( dg2rd = pi/180. ) parameter ( yrlen = 365.25 ) parameter ( dayscy = 365*4+1 ) parameter ( eqnx = 80.9028) parameter ( ob = 23.45*dg2rd ) parameter ( ecc = 0.0167 ) parameter ( per = 102.0*dg2rd) parameter ( daylen = 86400.) _RL TH(DAYSCY),T0,T1,T2,T3,T4,FUN,Y,MNDY(12,4) LOGICAL FIRST DATA FIRST/.TRUE./ SAVE DATA MNDY /0,31,60,91,121,152,182,213,244,274,305,335,366, . 397,34*0 / FUN(Y) = (TWO*PI/((ONE-ECC**2)**1.5))*(ONE/YRLEN) . * (ONE - ECC*COS(Y-PER)) ** 2 C*********************************************************************** C* SET CURRENT TIME * C*********************************************************************** YEAR = NYMD / 10000 MONTH = MOD(NYMD,10000) / 100 DAY = MOD(NYMD,100) SEC = NSECF(NHMS) C*********************************************************************** C* COMPUTE DAY-ANGLES FOR 4-YEAR CYCLE * C*********************************************************************** IF(FIRST) THEN DO 100 I=15,48 MNDY(I,1) = MNDY(I-12,1) + 365 100 CONTINUE KM = INT(EQNX) + 1 FAC = KM-EQNX T0 = ZERO T1 = FUN(T0 )*FAC T2 = FUN(ZERO+T1/TWO)*FAC T3 = FUN(ZERO+T2/TWO)*FAC T4 = FUN(ZERO+T3 )*FAC TH(KM) = (T1 + TWO*(T2 + T3) + T4) / SIX DO 200 K=2,DAYSCY T1 = FUN(TH(KM) ) T2 = FUN(TH(KM)+T1/TWO) T3 = FUN(TH(KM)+T2/TWO) T4 = FUN(TH(KM)+T3 ) KP = MOD(KM,DAYSCY) + 1 TH(KP) = TH(KM) + (T1 + TWO*(T2 + T3) + T4) / SIX KM = KP 200 CONTINUE FIRST=.FALSE. ENDIF C*********************************************************************** C* COMPUTE EARTH-SUN DISTANCE TO CURRENT SECOND * C*********************************************************************** IDAY = DAY + MNDY(MONTH,MOD(YEAR,4)+1) IDAYP1 = MOD( IDAY,DAYSCY) + 1 THM = MOD( TH(IDAY) ,TWO*PI) THP = MOD( TH(IDAYP1),TWO*PI) IF(THP.LT.THM) THP = THP + TWO*PI FAC = FLOAT(SEC)/DAYLEN THNOW = THM*(ONE-FAC) + THP*FAC ZS = SIN(THNOW) * SIN(OB) ZC = SQRT(ONE-ZS*ZS) RA = (1.-ECC*ECC) / ( ONE-ECC*COS(THNOW-PER) ) C*********************************************************************** C* COMPUTE COSINE OF THE ZENITH ANGLE * C*********************************************************************** FAC = FAC*TWO*PI + PI DO I = 1,IRUN HC = COS( FAC+ALON(I)*DG2RD ) SJ = SIN(ALAT(I)*DG2RD) CJ = SQRT(ONE-SJ*SJ) COSZ(I) = SJ*ZS + CJ*ZC*HC IF( COSZ(I).LT.ZERO ) COSZ(I) = ZERO ENDDO RETURN END subroutine time_bound(nymd,nhms,nymd1,nhms1,nymd2,nhms2,imnm,imnp) C*********************************************************************** C PURPOSE C Compute Date and Time boundaries. C C ARGUMENTS DESCRIPTION C nymd .... Current Date C nhms .... Current Time C nymd1 ... Previous Date Boundary C nhms1 ... Previous Time Boundary C nymd2 ... Subsequent Date Boundary C nhms2 ... Subsequent Time Boundary C C imnm .... Previous Time Index for Interpolation C imnp .... Subsequent Time Index for Interpolation C C*********************************************************************** implicit none integer nymd,nhms, nymd1,nhms1, nymd2,nhms2 c Local Variables c --------------- integer month,day,nyear,midmon1,midmon,midmon2 integer imnm,imnp INTEGER DAYS(14), daysm, days0, daysp DATA DAYS /31,31,28,31,30,31,30,31,31,30,31,30,31,31/ integer nmonf,ndayf,n NMONF(N) = MOD(N,10000)/100 NDAYF(N) = MOD(N,100) C********************************************************************* C**** Find Proper Month and Time Boundaries for Climatological Data ** C********************************************************************* MONTH = NMONF(NYMD) DAY = NDAYF(NYMD) daysm = days(month ) days0 = days(month+1) daysp = days(month+2) c Check for Leap Year c ------------------- nyear = nymd/10000 if( 4*(nyear/4).eq.nyear ) then if( month.eq.3 ) daysm = daysm+1 if( month.eq.2 ) days0 = days0+1 if( month.eq.1 ) daysp = daysp+1 endif MIDMON1 = daysm/2 + 1 MIDMON = days0/2 + 1 MIDMON2 = daysp/2 + 1 IF(DAY.LT.MIDMON) THEN imnm = month imnp = month + 1 nymd2 = (nymd/10000)*10000 + month*100 + midmon nhms2 = 000000 nymd1 = nymd2 nhms1 = nhms2 call tick ( nymd1,nhms1, -midmon *86400 ) call tick ( nymd1,nhms1,-(daysm-midmon1)*86400 ) ELSE IMNM = MONTH + 1 IMNP = MONTH + 2 nymd1 = (nymd/10000)*10000 + month*100 + midmon nhms1 = 000000 nymd2 = nymd1 nhms2 = nhms1 call tick ( nymd2,nhms2,(days0-midmon)*86400 ) call tick ( nymd2,nhms2, midmon2*86400 ) ENDIF c ------------------------------------------------------------- c Note: At this point, imnm & imnp range between 01-14, where c 01 -> Previous years December c 02-13 -> Current years January-December c 14 -> Next years January c ------------------------------------------------------------- imnm = imnm-1 imnp = imnp-1 if( imnm.eq.0 ) imnm = 12 if( imnp.eq.0 ) imnp = 12 if( imnm.eq.13 ) imnm = 1 if( imnp.eq.13 ) imnp = 1 return end