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MODULE date_utils
USE toolspar_kind
IMPLICIT NONE
CONTAINS
SUBROUTINE add_date(initial_date,hours,final_date)
! Add a number of hours to initial_date and return it in final_date
IMPLICIT NONE
!! Arguments
INTEGER,INTENT(in) :: initial_date ! Initial date (YYYYMMDDHH)
INTEGER,INTENT(in) :: hours ! Number of hours to add
INTEGER,INTENT(out) :: final_date ! Final date (YYYYMMDDHH)
!! Local variables
INTEGER :: isec,imin,ihours,iyear,imon,iday ! temporary results
REAL(dp):: juld
CALL split_date(initial_date,iyear,imon,iday,ihours)
CALL greg2jul(0,0,ihours,iday,imon,iyear,juld)
juld=juld+REAL(hours)/24.0
CALL jul2greg(isec,imin,ihours,iday,imon,iyear,juld)
final_date=iyear*1000000+imon*10000+iday*100+ihours
END SUBROUTINE add_date
SUBROUTINE add_days_to_date(initial_date,days,final_date)
! Add a number of days to initial_date and return it in final_date
IMPLICIT NONE
!! Arguments
INTEGER,INTENT(in) :: initial_date ! Initial date (YYYYMMDD)
INTEGER,INTENT(in) :: days ! Number of days to add
INTEGER,INTENT(out) :: final_date ! Final date (YYYYMMDD)
!! Local variables
INTEGER :: isec,imin,ihours,iyear,imon,iday ! temporary results
REAL(dp):: juld
! Account for lack of hours in date format (initial_date*100)
CALL split_date(initial_date*100,iyear,imon,iday,ihours)
CALL greg2jul(0,0,ihours,iday,imon,iyear,juld)
juld=juld+REAL(days)
CALL jul2greg(isec,imin,ihours,iday,imon,iyear,juld)
final_date=(iyear*1000000+imon*10000+iday*100+ihours)/100
END SUBROUTINE add_days_to_date
SUBROUTINE split_date(iyyyymmddhh,iyyyy,imm,idd,ihh)
! Splits a date in YYYYMMDDHH format into iyyyy, imm, idd, ihh
IMPLICIT NONE
INTEGER,INTENT(in) :: iyyyymmddhh
INTEGER,INTENT(out) :: iyyyy,imm,idd,ihh
iyyyy=iyyyymmddhh/1000000
imm=iyyyymmddhh/10000-iyyyy*100
idd=iyyyymmddhh/100-(iyyyy*10000+imm*100)
ihh=MOD(iyyyymmddhh,100)
END SUBROUTINE split_date
SUBROUTINE jul2greg( ksec, kminut, khour, kday, kmonth, kyear, &
& prelday )
IMPLICIT NONE
!!-----------------------------------------------------------------------
!!
!! *** ROUTINE jul2greg ***
!!
!! ** Purpose : Take the relative time in days and re-express in terms of
!! seconds, minutes, hours, days, month, year.
!!
!! ** Method : Reference date : 19500101
!!
!! ** Action :
!!
!! History
!! ! 06-04 (A. Vidard) Original
!! ! 06-05 (A. Vidard) Reformatted and refdate
!! ! 06-10 (A. Weaver) Cleanup
!!-----------------------------------------------------------------------
! * Arguments
INTEGER, INTENT(OUT) :: &
& ksec, &
& kminut, &
& khour, &
& kday, &
& kmonth, &
& kyear
REAL(KIND=dp), INTENT(IN) :: &
& prelday
!! * Local declarations
INTEGER, PARAMETER :: &
& jpgreg = 2299161, &
& jporef = 2433283, &
& jparef = 2415021
INTEGER :: &
& ijulian, &
& ij1, &
& ija, &
& ijb, &
& ijc, &
& ijd, &
& ije, &
& isec, &
& imin, &
& ihou, &
& iday, &
& imon, &
& iyea, &
& iref
REAL(KIND=wp) :: &
& zday, &
& zref
! Main computation
iref = jporef
zday = prelday
ksec = NINT( 86400. * MOD( zday, 1.0_wp ) )
IF ( ksec < 0. ) ksec = 86400. + ksec
khour = ksec / 3600
kminut = ( ksec - 3600 * khour ) / 60
ksec = MOD( ksec , 60 )
ijulian = iref + INT( zday )
IF ( zday < 0. ) ijulian = ijulian - 1
! If input date after 10/15/1582 :
IF ( ijulian >= jpgreg ) THEN
ij1 = INT( ( DBLE( ijulian - 1867216 ) - 0.25 ) / 36524.25 )
ija = ijulian + 1 + ij1 - INT( ( 0.25 * ij1 ) )
ELSE
ija = ijulian
ENDIF
ijb = ija + 1524
ijc = INT( 6680. + ( DBLE ( ijb - 2439870 ) - 122.1 ) / 365.25 )
ijd = 365 * ijc + INT( 0.25 * ijc )
ije = INT( ( ijb - ijd ) / 30.6001 )
kday = ijb - ijd - INT( 30.6001 * ije )
kmonth = ije - 1
IF ( kmonth > 12 ) kmonth = kmonth - 12
kyear = ijc - 4715
IF ( kmonth > 2 ) kyear = kyear - 1
IF ( kyear <= 0 ) kyear = kyear - 1
END SUBROUTINE jul2greg
SUBROUTINE greg2jul( ksec, kmin, khour, kday, kmonth, kyear, pjulian )
IMPLICIT NONE
!!-----------------------------------------------------------------------
!!
!! *** ROUTINE greg2jul ***
!!
!! ** Purpose : Produce the time relative to the current date and time.
!!
!! ** Method : The units are days, so hours and minutes transform to
!! fractions of a day.
!!
!! Reference date : 19500101
!! ** Action :
!!
!! History :
!! ! 06-04 (A. Vidard) Original
!! ! 06-04 (A. Vidard) Reformatted
!! ! 06-10 (A. Weaver) Cleanup
!!-----------------------------------------------------------------------
! * Arguments
INTEGER, INTENT(IN) :: &
& ksec, &
& kmin, &
& khour, &
& kday, &
& kmonth, &
& kyear
REAL(KIND=dp), INTENT(OUT) :: &
& pjulian
!! * Local declarations
INTEGER, PARAMETER :: &
& jpgreg = 15 + 31 * ( 10 + 12 * 1582 ), & ! Gregorian calendar introduction date
& jpjref = 2433283 ! Julian reference date: 19500101
INTEGER :: &
& ija, &
& ijy, &
& ijm, &
& ijultmp, &
& ijyear
! Main computation
ijyear = kyear
IF ( ijyear < 0 ) ijyear = ijyear + 1
IF ( kmonth > 2 ) THEN
ijy = ijyear
ijm = kmonth + 1
ELSE
ijy = ijyear - 1
ijm = kmonth + 13
ENDIF
ijultmp = INT( 365.25 * ijy ) + INT( 30.6001 * ijm ) + kday + 1720995
IF ( kday + 31 * ( kmonth + 12 * ijyear ) >= jpgreg ) THEN
ija = INT( 0.01 * ijy )
ijultmp = ijultmp + 2 - ija + INT( 0.25 * ija )
ENDIF
pjulian = ( ijultmp - jpjref ) + ( ( 60 * khour + kmin ) * 60 + ksec ) / 86400.
END SUBROUTINE greg2jul
SUBROUTINE addseconds(iyear,imon,iday,ihour,imin,isec,iaddsec)
! Add iaddsecs to the date and return the new date (in place)
!! Arguments
INTEGER,intent(inout) :: iyear,imon,iday,ihour,imin,isec,iaddsec
!! Local variables
INTEGER :: itotsec,idays,isecs
INTEGER :: mday(12) = (/31,28,31,30,31,30,31,31,30,31,30,31/)
itotsec=iaddsec+ihour*3600*imin*60+isec
IF (itotsec<0) THEN
WRITE(*,*)'Negative itotsec in addseconds'
WRITE(*,*)'This does not work'
RETURN
ENDIF
ihour=0
imin=0
isec=0
idays=itotsec/86400
isecs=itotsec-idays*86400
iday=iday+idays
! Compute the date
DO
! Leap year
mday(2)=28
IF (MOD(iyear,4).EQ.0) mday(2)=29
IF (MOD(iyear,100).EQ.0) mday(2)=28
IF (MOD(iyear,400).EQ.0) mday(2)=29
IF (MOD(iyear,4000).EQ.0) mday(2)=28
IF (iday.GT.mday(imon))THEN
iday=iday-mday(imon)
imon=imon+1
IF(imon.GT.12)THEN
imon=1
iyear=iyear+1
ENDIF
ELSE
EXIT
ENDIF
ENDDO
! Set the time
ihour=isecs/3600
imin=isecs/60-ihour*60
isec=isecs-ihour*3600-imin*60
END SUBROUTINE addseconds
INTEGER FUNCTION nextdate(idate)
! Return next date.
! Date format is assumed to be YYYYMMDD
IMPLICIT NONE
!! Arguments
INTEGER :: idate ! Initial date
!! Local variables
INTEGER :: year,day,mon
INTEGER :: mday(12) = (/31,28,31,30,31,30,31,31,30,31,30,31/)
day=MOD(idate,100)
mon=MOD((idate-day)/100,100)
year=idate/10000
mday(2)=28
IF (MOD(year,4).EQ.0) mday(2)=29
IF (MOD(year,100).EQ.0) mday(2)=28
IF (MOD(year,400).EQ.0) mday(2)= 29
IF (MOD(year,4000).EQ.0) mday(2) = 28
day=day+1
IF (day.GT.mday(mon))THEN
day=1
mon=mon+1
IF(mon.GT.12)THEN
mon=1
year=year+1
ENDIF
ENDIF
nextdate=year*10000+mon*100+day
RETURN
END FUNCTION nextdate
INTEGER FUNCTION prevdate(idate)
! Return previous date.
! Date format is assumed to be YYYYMMDD
IMPLICIT NONE
!! Arguments
INTEGER :: idate ! Initial date
!! Local variables
INTEGER :: year,day,mon
INTEGER :: mday(12) = (/31,28,31,30,31,30,31,31,30,31,30,31/)
day=MOD(idate,100)
mon=MOD((idate-day)/100,100)
year=idate/10000
mday(2)=28
IF (MOD(year,4).EQ.0) mday(2)=29
IF (MOD(year,100).EQ.0) mday(2)=28
IF (MOD(year,400).EQ.0) mday(2)= 29
IF (MOD(year,4000).EQ.0) mday(2) = 28
day=day-1
IF (day.LT.1)THEN
mon=mon-1
IF(mon.LT.1)THEN
mon=12
year=year-1
ENDIF
day=mday(mon)
ENDIF
prevdate=year*10000+mon*100+day
RETURN
END FUNCTION prevdate
INTEGER FUNCTION diffdate(idate1,idate2)
! Compute difference in days between dates
! Assumes YYYYMMDD format for dates
IMPLICIT NONE
!! Argument
INTEGER :: idate1,idate2 ! Dates to be diffed.
!! Local variables
INTEGER :: itdate1,itdate2
INTEGER :: it
itdate1=MIN(idate1,idate2)
itdate2=MAX(idate1,idate2)
IF (itdate1==itdate2) THEN
diffdate=0
RETURN
ENDIF
diffdate=0
it=itdate1
DO
it=nextdate(it)
diffdate=diffdate+1
IF (it==itdate2) EXIT
ENDDO
RETURN
END FUNCTION diffdate
INTEGER FUNCTION difftime(itime1,itime2)
! Compute difference in minutes between times
! Assumes HHMM or HMM or MM or M format for dates
!
! ORDER MATTERS - itime1 is ealier time
! Result is an integer number of minutes
IMPLICIT NONE
INTEGER, INTENT(IN) :: itime1,itime2 ! Times to be diffed.
INTEGER :: imin1, imin2, ihr1, ihr2
ihr1 = (itime1/100)
ihr2 = (itime2/100)
imin1 = (itime1 - ihr1*100) + (60 * ihr1)
imin2 = (itime2 - ihr2*100) + (60 * ihr2)
! Assume that itime2 is later, so wrap around midnight if necessary.
IF (imin2 < imin1) THEN
imin2 = imin2 + 24*60
END IF
difftime = imin2 - imin1
END FUNCTION difftime
INTEGER FUNCTION add_mins_to_time(itime1, imin_add)
! Add number of minutes onto given time
! Assumes time in HHMM or HMM or MM or M format
!
! Result is in HHMM format
IMPLICIT NONE
INTEGER, INTENT(IN) :: itime1,imin_add
INTEGER :: imin1, ihr1, imin2, ihr2
ihr1 = (itime1/100)
! itime1 in minutes from previous midnight
imin1 = (itime1 - ihr1*100) + (60 * ihr1)
imin1 = imin1 + imin_add
! Add 1day if time went nagative
IF (imin1 < 0) THEN
imin1 = imin1 + 24*60
END IF
! Turn number of minutes back into HHMM
ihr2 = imin1/60
imin2 = imin1 - ihr2*60
DO
IF (ihr2<0) THEN
ihr2 = ihr2 + 24
ELSE IF (ihr2>=24) THEN
ihr2 = ihr2 - 24
END IF
IF ((ihr2>=0).OR.(ihr2<24)) EXIT
END DO
add_mins_to_time = ihr2*100 + imin2
END FUNCTION add_mins_to_time
END MODULE date_utils