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