[3000] | 1 | MODULE date_utils |
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| 2 | |
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| 3 | USE toolspar_kind |
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| 4 | IMPLICIT NONE |
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| 5 | |
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| 6 | CONTAINS |
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| 7 | |
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| 8 | SUBROUTINE add_date(initial_date,hours,final_date) |
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| 9 | |
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| 10 | ! Add a number of hours to initial_date and return it in final_date |
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| 11 | |
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| 12 | IMPLICIT NONE |
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| 13 | |
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| 14 | |
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| 15 | !! Arguments |
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| 16 | INTEGER,INTENT(in) :: initial_date ! Initial date (YYYYMMDDHH) |
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| 17 | INTEGER,INTENT(in) :: hours ! Number of hours to add |
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| 18 | INTEGER,INTENT(out) :: final_date ! Final date (YYYYMMDDHH) |
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| 19 | |
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| 20 | !! Local variables |
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| 21 | |
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| 22 | INTEGER :: isec,imin,ihours,iyear,imon,iday ! temporary results |
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| 23 | REAL(dp):: juld |
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| 24 | |
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| 25 | CALL split_date(initial_date,iyear,imon,iday,ihours) |
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| 26 | |
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| 27 | CALL greg2jul(0,0,ihours,iday,imon,iyear,juld) |
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| 28 | |
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| 29 | juld=juld+REAL(hours)/24.0 |
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| 30 | |
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| 31 | CALL jul2greg(isec,imin,ihours,iday,imon,iyear,juld) |
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| 32 | |
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| 33 | final_date=iyear*1000000+imon*10000+iday*100+ihours |
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| 34 | |
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| 35 | END SUBROUTINE add_date |
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| 36 | |
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| 37 | SUBROUTINE split_date(iyyyymmddhh,iyyyy,imm,idd,ihh) |
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| 38 | |
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| 39 | ! Splits a date in YYYYMMDDHH format into iyyyy, imm, idd, ihh |
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| 40 | |
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| 41 | IMPLICIT NONE |
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| 42 | INTEGER,INTENT(in) :: iyyyymmddhh |
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| 43 | INTEGER,INTENT(out) :: iyyyy,imm,idd,ihh |
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| 44 | |
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| 45 | iyyyy=iyyyymmddhh/1000000 |
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| 46 | imm=iyyyymmddhh/10000-iyyyy*100 |
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| 47 | idd=iyyyymmddhh/100-(iyyyy*10000+imm*100) |
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| 48 | ihh=MOD(iyyyymmddhh,100) |
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| 49 | |
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| 50 | END SUBROUTINE split_date |
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| 51 | |
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| 52 | SUBROUTINE jul2greg( ksec, kminut, khour, kday, kmonth, kyear, & |
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| 53 | & prelday ) |
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| 54 | |
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| 55 | IMPLICIT NONE |
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| 56 | !!----------------------------------------------------------------------- |
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| 57 | !! |
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| 58 | !! *** ROUTINE jul2greg *** |
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| 59 | !! |
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| 60 | !! ** Purpose : Take the relative time in days and re-express in terms of |
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| 61 | !! seconds, minutes, hours, days, month, year. |
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| 62 | !! |
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| 63 | !! ** Method : Reference date : 19500101 |
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| 64 | !! |
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| 65 | !! ** Action : |
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| 66 | !! |
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| 67 | !! History |
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| 68 | !! ! 06-04 (A. Vidard) Original |
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| 69 | !! ! 06-05 (A. Vidard) Reformatted and refdate |
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| 70 | !! ! 06-10 (A. Weaver) Cleanup |
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| 71 | !!----------------------------------------------------------------------- |
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| 72 | |
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| 73 | ! * Arguments |
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| 74 | INTEGER, INTENT(OUT) :: & |
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| 75 | & ksec, & |
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| 76 | & kminut, & |
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| 77 | & khour, & |
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| 78 | & kday, & |
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| 79 | & kmonth, & |
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| 80 | & kyear |
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| 81 | REAL(KIND=dp), INTENT(IN) :: & |
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| 82 | & prelday |
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| 83 | |
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| 84 | !! * Local declarations |
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| 85 | INTEGER, PARAMETER :: & |
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| 86 | & jpgreg = 2299161, & |
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| 87 | & jporef = 2433283, & |
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| 88 | & jparef = 2415021 |
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| 89 | INTEGER :: & |
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| 90 | & ijulian, & |
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| 91 | & ij1, & |
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| 92 | & ija, & |
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| 93 | & ijb, & |
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| 94 | & ijc, & |
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| 95 | & ijd, & |
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| 96 | & ije, & |
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| 97 | & isec, & |
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| 98 | & imin, & |
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| 99 | & ihou, & |
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| 100 | & iday, & |
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| 101 | & imon, & |
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| 102 | & iyea, & |
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| 103 | & iref |
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| 104 | REAL(KIND=wp) :: & |
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| 105 | & zday, & |
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| 106 | & zref |
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| 107 | |
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| 108 | ! Main computation |
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| 109 | iref = jporef |
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| 110 | |
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| 111 | zday = prelday |
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| 112 | ksec = NINT( 86400. * MOD( zday, 1.0_wp ) ) |
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| 113 | |
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| 114 | IF ( ksec < 0. ) ksec = 86400. + ksec |
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| 115 | |
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| 116 | khour = ksec / 3600 |
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| 117 | kminut = ( ksec - 3600 * khour ) / 60 |
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| 118 | ksec = MOD( ksec , 60 ) |
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| 119 | |
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| 120 | ijulian = iref + INT( zday ) |
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| 121 | IF ( zday < 0. ) ijulian = ijulian - 1 |
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| 122 | |
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| 123 | ! If input date after 10/15/1582 : |
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| 124 | IF ( ijulian >= jpgreg ) THEN |
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| 125 | ij1 = INT( ( DBLE( ijulian - 1867216 ) - 0.25 ) / 36524.25 ) |
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| 126 | ija = ijulian + 1 + ij1 - INT( ( 0.25 * ij1 ) ) |
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| 127 | ELSE |
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| 128 | ija = ijulian |
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| 129 | ENDIF |
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| 130 | |
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| 131 | ijb = ija + 1524 |
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| 132 | ijc = INT( 6680. + ( DBLE ( ijb - 2439870 ) - 122.1 ) / 365.25 ) |
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| 133 | ijd = 365 * ijc + INT( 0.25 * ijc ) |
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| 134 | ije = INT( ( ijb - ijd ) / 30.6001 ) |
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| 135 | kday = ijb - ijd - INT( 30.6001 * ije ) |
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| 136 | kmonth = ije - 1 |
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| 137 | IF ( kmonth > 12 ) kmonth = kmonth - 12 |
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| 138 | kyear = ijc - 4715 |
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| 139 | IF ( kmonth > 2 ) kyear = kyear - 1 |
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| 140 | IF ( kyear <= 0 ) kyear = kyear - 1 |
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| 141 | |
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| 142 | END SUBROUTINE jul2greg |
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| 143 | |
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| 144 | SUBROUTINE greg2jul( ksec, kmin, khour, kday, kmonth, kyear, pjulian ) |
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| 145 | |
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| 146 | IMPLICIT NONE |
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| 147 | !!----------------------------------------------------------------------- |
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| 148 | !! |
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| 149 | !! *** ROUTINE greg2jul *** |
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| 150 | !! |
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| 151 | !! ** Purpose : Produce the time relative to the current date and time. |
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| 152 | !! |
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| 153 | !! ** Method : The units are days, so hours and minutes transform to |
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| 154 | !! fractions of a day. |
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| 155 | !! |
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| 156 | !! Reference date : 19500101 |
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| 157 | !! ** Action : |
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| 158 | !! |
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| 159 | !! History : |
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| 160 | !! ! 06-04 (A. Vidard) Original |
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| 161 | !! ! 06-04 (A. Vidard) Reformatted |
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| 162 | !! ! 06-10 (A. Weaver) Cleanup |
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| 163 | !!----------------------------------------------------------------------- |
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| 164 | |
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| 165 | ! * Arguments |
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| 166 | INTEGER, INTENT(IN) :: & |
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| 167 | & ksec, & |
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| 168 | & kmin, & |
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| 169 | & khour, & |
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| 170 | & kday, & |
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| 171 | & kmonth, & |
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| 172 | & kyear |
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| 173 | REAL(KIND=dp), INTENT(OUT) :: & |
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| 174 | & pjulian |
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| 175 | |
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| 176 | !! * Local declarations |
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| 177 | INTEGER, PARAMETER :: & |
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| 178 | & jpgreg = 15 + 31 * ( 10 + 12 * 1582 ), & ! Gregorian calendar introduction date |
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| 179 | & jpjref = 2433283 ! Julian reference date: 19500101 |
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| 180 | INTEGER :: & |
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| 181 | & ija, & |
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| 182 | & ijy, & |
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| 183 | & ijm, & |
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| 184 | & ijultmp, & |
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| 185 | & ijyear |
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| 186 | |
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| 187 | ! Main computation |
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| 188 | ijyear = kyear |
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| 189 | IF ( ijyear < 0 ) ijyear = ijyear + 1 |
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| 190 | IF ( kmonth > 2 ) THEN |
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| 191 | ijy = ijyear |
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| 192 | ijm = kmonth + 1 |
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| 193 | ELSE |
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| 194 | ijy = ijyear - 1 |
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| 195 | ijm = kmonth + 13 |
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| 196 | ENDIF |
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| 197 | ijultmp = INT( 365.25 * ijy ) + INT( 30.6001 * ijm ) + kday + 1720995 |
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| 198 | IF ( kday + 31 * ( kmonth + 12 * ijyear ) >= jpgreg ) THEN |
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| 199 | ija = INT( 0.01 * ijy ) |
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| 200 | ijultmp = ijultmp + 2 - ija + INT( 0.25 * ija ) |
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| 201 | ENDIF |
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| 202 | pjulian = ( ijultmp - jpjref ) + ( ( 60 * khour + kmin ) * 60 + ksec ) / 86400. |
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| 203 | |
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| 204 | END SUBROUTINE greg2jul |
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| 205 | |
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| 206 | |
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| 207 | SUBROUTINE addseconds(iyear,imon,iday,ihour,imin,isec,iaddsec) |
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| 208 | |
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| 209 | ! Add iaddsecs to the date and return the new date (in place) |
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| 210 | |
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| 211 | !! Arguments |
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| 212 | |
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| 213 | INTEGER,intent(inout) :: iyear,imon,iday,ihour,imin,isec,iaddsec |
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| 214 | |
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| 215 | !! Local variables |
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| 216 | |
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| 217 | INTEGER :: itotsec,idays,isecs |
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| 218 | INTEGER :: mday(12) = (/31,28,31,30,31,30,31,31,30,31,30,31/) |
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| 219 | |
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| 220 | itotsec=iaddsec+ihour*3600*imin*60+isec |
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| 221 | |
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| 222 | IF (itotsec<0) THEN |
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| 223 | WRITE(*,*)'Negative itotsec in addseconds' |
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| 224 | WRITE(*,*)'This does not work' |
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| 225 | RETURN |
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| 226 | ENDIF |
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| 227 | |
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| 228 | ihour=0 |
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| 229 | imin=0 |
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| 230 | isec=0 |
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| 231 | |
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| 232 | idays=itotsec/86400 |
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| 233 | isecs=itotsec-idays*86400 |
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| 234 | iday=iday+idays |
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| 235 | |
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| 236 | ! Compute the date |
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| 237 | DO |
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| 238 | ! Leap year |
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| 239 | mday(2)=28 |
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| 240 | IF (MOD(iyear,4).EQ.0) mday(2)=29 |
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| 241 | IF (MOD(iyear,100).EQ.0) mday(2)=28 |
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| 242 | IF (MOD(iyear,400).EQ.0) mday(2)=29 |
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| 243 | IF (MOD(iyear,4000).EQ.0) mday(2)=28 |
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| 244 | |
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| 245 | IF (iday.GT.mday(imon))THEN |
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| 246 | iday=iday-mday(imon) |
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| 247 | imon=imon+1 |
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| 248 | IF(imon.GT.12)THEN |
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| 249 | imon=1 |
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| 250 | iyear=iyear+1 |
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| 251 | ENDIF |
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| 252 | ELSE |
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| 253 | EXIT |
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| 254 | ENDIF |
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| 255 | |
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| 256 | ENDDO |
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| 257 | |
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| 258 | ! Set the time |
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| 259 | ihour=isecs/3600 |
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| 260 | imin=isecs/60-ihour*60 |
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| 261 | isec=isecs-ihour*3600-imin*60 |
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| 262 | |
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| 263 | END SUBROUTINE addseconds |
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| 264 | |
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| 265 | INTEGER FUNCTION nextdate(idate) |
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| 266 | |
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| 267 | ! Return next date. |
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| 268 | ! Date format is assumed to be YYYYMMDD |
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| 269 | |
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| 270 | IMPLICIT NONE |
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| 271 | |
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| 272 | !! Arguments |
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| 273 | |
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| 274 | INTEGER :: idate ! Initial date |
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| 275 | |
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| 276 | !! Local variables |
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| 277 | |
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| 278 | INTEGER :: year,day,mon |
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| 279 | INTEGER :: mday(12) = (/31,28,31,30,31,30,31,31,30,31,30,31/) |
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| 280 | |
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| 281 | |
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| 282 | day=MOD(idate,100) |
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| 283 | mon=MOD((idate-day)/100,100) |
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| 284 | year=idate/10000 |
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| 285 | |
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| 286 | mday(2)=28 |
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| 287 | IF (MOD(year,4).EQ.0) mday(2)=29 |
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| 288 | IF (MOD(year,100).EQ.0) mday(2)=28 |
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| 289 | IF (MOD(year,400).EQ.0) mday(2)= 29 |
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| 290 | IF (MOD(year,4000).EQ.0) mday(2) = 28 |
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| 291 | |
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| 292 | day=day+1 |
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| 293 | IF (day.GT.mday(mon))THEN |
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| 294 | day=1 |
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| 295 | mon=mon+1 |
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| 296 | IF(mon.GT.12)THEN |
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| 297 | mon=1 |
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| 298 | year=year+1 |
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| 299 | ENDIF |
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| 300 | ENDIF |
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| 301 | nextdate=year*10000+mon*100+day |
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| 302 | RETURN |
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| 303 | |
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| 304 | END FUNCTION nextdate |
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| 305 | |
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| 306 | INTEGER FUNCTION prevdate(idate) |
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| 307 | |
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| 308 | ! Return previous date. |
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| 309 | ! Date format is assumed to be YYYYMMDD |
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| 310 | |
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| 311 | IMPLICIT NONE |
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| 312 | |
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| 313 | !! Arguments |
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| 314 | |
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| 315 | INTEGER :: idate ! Initial date |
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| 316 | |
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| 317 | !! Local variables |
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| 318 | |
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| 319 | INTEGER :: year,day,mon |
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| 320 | INTEGER :: mday(12) = (/31,28,31,30,31,30,31,31,30,31,30,31/) |
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| 321 | |
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| 322 | |
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| 323 | day=MOD(idate,100) |
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| 324 | mon=MOD((idate-day)/100,100) |
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| 325 | year=idate/10000 |
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| 326 | |
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| 327 | mday(2)=28 |
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| 328 | IF (MOD(year,4).EQ.0) mday(2)=29 |
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| 329 | IF (MOD(year,100).EQ.0) mday(2)=28 |
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| 330 | IF (MOD(year,400).EQ.0) mday(2)= 29 |
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| 331 | IF (MOD(year,4000).EQ.0) mday(2) = 28 |
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| 332 | |
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| 333 | day=day-1 |
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| 334 | IF (day.LT.1)THEN |
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| 335 | mon=mon-1 |
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| 336 | IF(mon.LT.1)THEN |
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| 337 | mon=12 |
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| 338 | year=year-1 |
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| 339 | ENDIF |
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| 340 | day=mday(mon) |
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| 341 | ENDIF |
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| 342 | prevdate=year*10000+mon*100+day |
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| 343 | RETURN |
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| 344 | |
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| 345 | END FUNCTION prevdate |
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| 346 | |
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| 347 | INTEGER FUNCTION diffdate(idate1,idate2) |
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| 348 | |
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| 349 | ! Compute difference in days between dates |
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| 350 | ! Assumes YYYYMMDD format for dates |
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| 351 | |
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| 352 | IMPLICIT NONE |
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| 353 | |
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| 354 | !! Argument |
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| 355 | |
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| 356 | INTEGER :: idate1,idate2 ! Dates to be diffed. |
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| 357 | |
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| 358 | !! Local variables |
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| 359 | |
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| 360 | INTEGER :: itdate1,itdate2 |
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| 361 | INTEGER :: it |
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| 362 | |
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| 363 | itdate1=MIN(idate1,idate2) |
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| 364 | itdate2=MAX(idate1,idate2) |
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| 365 | |
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| 366 | IF (itdate1==itdate2) THEN |
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| 367 | diffdate=0 |
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| 368 | RETURN |
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| 369 | ENDIF |
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| 370 | diffdate=0 |
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| 371 | it=itdate1 |
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| 372 | DO |
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| 373 | it=nextdate(it) |
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| 374 | diffdate=diffdate+1 |
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| 375 | IF (it==itdate2) EXIT |
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| 376 | ENDDO |
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| 377 | RETURN |
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| 378 | |
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| 379 | END FUNCTION diffdate |
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| 380 | |
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| 381 | |
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| 382 | END MODULE date_utils |
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