1 | ! SPDX-FileCopyrightText: FLEXPART 1998-2019, see flexpart_license.txt |
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2 | ! SPDX-License-Identifier: GPL-3.0-or-later |
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3 | |
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4 | subroutine caldate(juldate,yyyymmdd,hhmiss) |
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5 | ! i o o |
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6 | !***************************************************************************** |
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7 | ! * |
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8 | ! Calculates the Gregorian date from the Julian date * |
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9 | ! * |
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10 | ! AUTHOR: Andreas Stohl (21 January 1994), adapted from Numerical Recipes* |
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11 | ! * |
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12 | ! Variables: * |
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13 | ! dd Day * |
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14 | ! hh Hour * |
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15 | ! hhmiss Hour, Minute, Second * |
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16 | ! ja,jb,jc,jd,je help variables * |
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17 | ! jalpha help variable * |
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18 | ! juldate Julian Date * |
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19 | ! julday help variable * |
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20 | ! mi Minute * |
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21 | ! mm Month * |
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22 | ! ss Seconds * |
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23 | ! yyyy Year * |
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24 | ! yyyymmdd Year, Month, Day * |
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25 | ! * |
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26 | ! Constants: * |
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27 | ! igreg help constant * |
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28 | ! * |
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29 | !***************************************************************************** |
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30 | |
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31 | use par_mod, only: dp |
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32 | |
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33 | implicit none |
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34 | |
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35 | integer :: yyyymmdd,yyyy,mm,dd,hhmiss,hh,mi,ss |
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36 | integer :: julday,ja,jb,jc,jd,je,jalpha |
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37 | real(kind=dp) :: juldate |
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38 | integer,parameter :: igreg=2299161 |
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39 | |
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40 | julday=int(juldate) |
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41 | if(julday.ge.igreg)then |
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42 | jalpha=int(((julday-1867216)-0.25)/36524.25) |
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43 | ja=julday+1+jalpha-int(0.25*jalpha) |
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44 | else |
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45 | ja=julday |
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46 | endif |
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47 | jb=ja+1524 |
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48 | jc=int(6680.+((jb-2439870)-122.1)/365.25) |
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49 | jd=365*jc+int(0.25*jc) |
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50 | je=int((jb-jd)/30.6001) |
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51 | dd=jb-jd-int(30.6001*je) |
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52 | mm=je-1 |
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53 | if (mm.gt.12) mm=mm-12 |
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54 | yyyy=jc-4715 |
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55 | if (mm.gt.2) yyyy=yyyy-1 |
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56 | if (yyyy.le.0) yyyy=yyyy-1 |
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57 | |
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58 | yyyymmdd=10000*yyyy+100*mm+dd |
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59 | hh=int(24._dp*(juldate-real(julday,kind=dp))) |
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60 | mi=int(1440._dp*(juldate-real(julday,kind=dp))-60._dp*real(hh,kind=dp)) |
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61 | ss=nint(86400._dp*(juldate-real(julday,kind=dp))-3600._dp*real(hh,kind=dp)- & |
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62 | 60._dp*real(mi,kind=dp)) |
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63 | if (ss.eq.60) then ! 60 seconds = 1 minute |
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64 | ss=0 |
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65 | mi=mi+1 |
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66 | endif |
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67 | if (mi.eq.60) then |
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68 | mi=0 |
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69 | hh=hh+1 |
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70 | endif |
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71 | hhmiss=10000*hh+100*mi+ss |
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72 | |
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73 | end subroutine caldate |
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