| 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 | ! PS 2020-07-27: add a check to avoid giving back 240000 for hhmiss * |
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| 30 | ! * |
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| 31 | !***************************************************************************** |
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| 32 | |
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| 33 | use par_mod, only: dp |
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| 34 | |
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| 35 | implicit none |
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| 36 | |
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| 37 | integer :: yyyymmdd,yyyy,mm,dd,hhmiss,hh,mi,ss |
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| 38 | integer :: julday,ja,jb,jc,jd,je,jalpha |
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| 39 | real(kind=dp) :: juldate |
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| 40 | integer,parameter :: igreg=2299161 |
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| 41 | |
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| 42 | julday=int(juldate) |
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| 43 | ! PS check to avoid 240000 as hhmiss: |
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| 44 | if ((juldate-julday)*86400._dp .ge. 86399.5_dp) then |
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| 45 | juldate = juldate + juldate-julday-86399.5_dp/86400._dp |
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| 46 | julday=int(juldate) |
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| 47 | endif |
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| 48 | if(julday.ge.igreg)then |
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| 49 | jalpha=int(((julday-1867216)-0.25)/36524.25) |
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| 50 | ja=julday+1+jalpha-int(0.25*jalpha) |
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| 51 | else |
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| 52 | ja=julday |
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| 53 | endif |
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| 54 | jb=ja+1524 |
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| 55 | jc=int(6680.+((jb-2439870)-122.1)/365.25) |
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| 56 | jd=365*jc+int(0.25*jc) |
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| 57 | je=int((jb-jd)/30.6001) |
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| 58 | dd=jb-jd-int(30.6001*je) |
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| 59 | mm=je-1 |
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| 60 | if (mm.gt.12) mm=mm-12 |
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| 61 | yyyy=jc-4715 |
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| 62 | if (mm.gt.2) yyyy=yyyy-1 |
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| 63 | if (yyyy.le.0) yyyy=yyyy-1 |
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| 64 | |
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| 65 | yyyymmdd=10000*yyyy+100*mm+dd |
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| 66 | hh=int(24._dp*(juldate-real(julday,kind=dp))) |
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| 67 | mi=int(1440._dp*(juldate-real(julday,kind=dp))-60._dp*real(hh,kind=dp)) |
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| 68 | ss=nint(86400._dp*(juldate-real(julday,kind=dp))-3600._dp*real(hh,kind=dp)- & |
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| 69 | 60._dp*real(mi,kind=dp)) |
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| 70 | if (ss.eq.60) then ! 60 seconds = 1 minute |
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| 71 | ss=0 |
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| 72 | mi=mi+1 |
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| 73 | endif |
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| 74 | if (mi.eq.60) then |
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| 75 | mi=0 |
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| 76 | hh=hh+1 |
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| 77 | endif |
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| 78 | hhmiss=10000*hh+100*mi+ss |
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| 79 | |
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| 80 | end subroutine caldate |
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