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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