| 1 | SUBROUTINE greg2jul( ksec, kmin, khour, kday, kmonth, kyear, pjulian, & |
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| 2 | & krefdate ) |
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| 3 | !!----------------------------------------------------------------------- |
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| 4 | !! |
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| 5 | !! *** ROUTINE greg2jul *** |
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| 6 | !! |
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| 7 | !! ** Purpose : Produce the time relative to the current date and time. |
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| 8 | !! |
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| 9 | !! ** Method : The units are days, so hours and minutes transform to |
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| 10 | !! fractions of a day. |
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| 11 | !! |
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| 12 | !! Reference date : 19500101 |
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| 13 | !! ** Action : |
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| 14 | !! |
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| 15 | !! History : |
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| 16 | !! ! 06-04 (A. Vidard) Original |
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| 17 | !! ! 06-04 (A. Vidard) Reformatted |
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| 18 | !! ! 06-10 (A. Weaver) Cleanup |
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| 19 | !!----------------------------------------------------------------------- |
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| 20 | |
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| 21 | ! * Arguments |
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| 22 | INTEGER, INTENT(IN) :: & |
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| 23 | & ksec, & |
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| 24 | & kmin, & |
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| 25 | & khour, & |
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| 26 | & kday, & |
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| 27 | & kmonth, & |
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| 28 | & kyear |
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| 29 | REAL(KIND=dp), INTENT(OUT) :: & |
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| 30 | & pjulian |
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| 31 | INTEGER, INTENT(IN), OPTIONAL :: & |
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| 32 | & krefdate |
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| 33 | |
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| 34 | !! * Local declarations |
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| 35 | INTEGER, PARAMETER :: & |
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| 36 | & jpgreg = 15 + 31 * ( 10 + 12 * 1582 ), & ! Gregorian calendar introduction date |
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| 37 | & jporef = 2433283, & ! Julian reference date: 19500101 |
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| 38 | & jparef = 2415021, & ! Julian reference date: 19000101 |
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| 39 | & jpgref = 2299161 ! Julian reference date start of Gregorian calender |
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| 40 | INTEGER :: & |
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| 41 | & ija, & |
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| 42 | & ijy, & |
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| 43 | & ijm, & |
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| 44 | & ijultmp, & |
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| 45 | & ijyear, & |
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| 46 | & iref |
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| 47 | CHARACTER(len=200) :: & |
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| 48 | & cerr |
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| 49 | |
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| 50 | IF ( PRESENT( krefdate ) ) THEN |
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| 51 | SELECT CASE ( krefdate ) |
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| 52 | |
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| 53 | CASE( 0 ) |
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| 54 | iref = jpgref |
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| 55 | |
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| 56 | CASE( 19500101 ) |
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| 57 | iref = jporef |
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| 58 | |
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| 59 | CASE( 19000101 ) |
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| 60 | iref = jparef |
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| 61 | |
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| 62 | CASE DEFAULT |
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| 63 | WRITE(cerr,'(A,I8.8)')'greg2jul: Unknown krefdate:', krefdate |
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| 64 | CALL ctl_stop( cerr ) |
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| 65 | |
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| 66 | END SELECT |
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| 67 | |
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| 68 | ELSE |
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| 69 | iref = jporef |
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| 70 | ENDIF |
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| 71 | |
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| 72 | ! Main computation |
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| 73 | ijyear = kyear |
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| 74 | IF ( ijyear < 0 ) ijyear = ijyear + 1 |
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| 75 | IF ( kmonth > 2 ) THEN |
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| 76 | ijy = ijyear |
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| 77 | ijm = kmonth + 1 |
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| 78 | ELSE |
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| 79 | ijy = ijyear - 1 |
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| 80 | ijm = kmonth + 13 |
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| 81 | ENDIF |
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| 82 | ijultmp = INT( 365.25 * ijy ) + INT( 30.6001 * ijm ) + kday + 1720995 |
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| 83 | IF ( kday + 31 * ( kmonth + 12 * ijyear ) >= jpgreg ) THEN |
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| 84 | ija = INT( 0.01 * ijy ) |
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| 85 | ijultmp = ijultmp + 2 - ija + INT( 0.25 * ija ) |
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| 86 | ENDIF |
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| 87 | pjulian = ( ijultmp - iref ) + ( ( 60 * khour + kmin ) * 60 + ksec ) / 86400. |
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| 88 | |
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| 89 | END SUBROUTINE greg2jul |
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