SUBROUTINE iau_JDCALF ( NDP, DJ1, DJ2, IYMDF, J ) *+ * - - - - - - - - - - - * i a u _ J D C A L F * - - - - - - - - - - - * * Julian Date to Gregorian Calendar, expressed in a form convenient * for formatting messages: rounded to a specified precision, and with * the fields stored in a single array. * * This routine is part of the International Astronomical Union's * SOFA (Standards of Fundamental Astronomy) software collection. * * Status: support routine. * * Given: * NDP i number of decimal places of days in fraction * DJ1,DJ2 d DJ1+DJ2 = Julian Date (Note 1) * * Returned: * IYMDF i(4) year, month, day, fraction in Gregorian * calendar * J i status: * -1 = date out of range * 0 = OK * +1 = NDP not 0-9 (interpreted as 0) * * Notes: * * 1) The Julian Date is apportioned in any convenient way between * the arguments DJ1 and DJ2. For example, JD=2450123.7 could * be expressed in any of these ways, among others: * * DJ1 DJ2 * * 2450123.7D0 0D0 (JD method) * 2451545D0 -1421.3D0 (J2000 method) * 2400000.5D0 50123.2D0 (MJD method) * 2450123.5D0 0.2D0 (date & time method) * * 2) In early eras the conversion is from the "Proleptic Gregorian * Calendar"; no account is taken of the date(s) of adoption of * the Gregorian Calendar, nor is the AD/BC numbering convention * observed. * * 3) See also the routine iau_JD2CAL. * * 4) The number of decimal places NDP should be 4 or less if internal * overflows are to be avoided on platforms which use 16-bit integers. * * Called: * iau_JD2CAL JD to Gregorian calendar * * Reference: * * Explanatory Supplement to the Astronomical Almanac, * P. Kenneth Seidelmann (ed), University Science Books (1992), * Section 12.92 (p604). * * This revision: 2020 October 22 * * SOFA release 2021-05-12 * * Copyright (C) 2021 IAU SOFA Board. See notes at end. * *----------------------------------------------------------------------- IMPLICIT NONE INTEGER NDP DOUBLE PRECISION DJ1, DJ2 INTEGER IYMDF(4), J INTEGER JS DOUBLE PRECISION DENOM, D1, D2, F1, F2, D, DJD, F, RF * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - * Denominator of fraction (e.g. 100 for 2 decimal places). IF ( NDP.GE.0 .AND. NDP.LE.9 ) THEN J = 0 DENOM = DBLE(10**NDP) ELSE J = 1 DENOM = 1D0 END IF * Copy the date, big then small. IF ( ABS(DJ1) .GE. ABS(DJ2) ) THEN D1 = DJ1 D2 = DJ2 ELSE D1 = DJ2 D2 = DJ1 END IF * Realign to midnight (without rounding error). D1 = D1 - 0.5D0 * Separate day and fraction (as precisely as possible). D = ANINT(D1) F1 = D1 - D DJD = D D = ANINT(D2) F2 = D2 -D DJD = DJD + D; D = ANINT(F1+F2) F = (F1-D) + F2 IF ( F .LT. 0D0 ) THEN F = F + 1D0 D = D - 1D0 END IF DJD = DJD + D * Round the total fraction to the specified number of places. RF = ANINT(F*DENOM) / DENOM; * Re-align to noon. DJD = DJD + 0.5D0 * Convert to Gregorian calendar. CALL iau_JD2CAL ( DJD, RF, IYMDF(1), IYMDF(2), IYMDF(3), F, JS ) IF ( JS .EQ. 0 ) THEN IYMDF(4) = NINT(F*DENOM) ELSE J = JS END IF * Finished. *+---------------------------------------------------------------------- * * Copyright (C) 2021 * Standards Of Fundamental Astronomy Board * of the International Astronomical Union. * * ===================== * SOFA Software License * ===================== * * NOTICE TO USER: * * BY USING THIS SOFTWARE YOU ACCEPT THE FOLLOWING SIX TERMS AND * CONDITIONS WHICH APPLY TO ITS USE. * * 1. The Software is owned by the IAU SOFA Board ("SOFA"). * * 2. Permission is granted to anyone to use the SOFA software for any * purpose, including commercial applications, free of charge and * without payment of royalties, subject to the conditions and * restrictions listed below. * * 3. You (the user) may copy and distribute SOFA source code to others, * and use and adapt its code and algorithms in your own software, * on a world-wide, royalty-free basis. That portion of your * distribution that does not consist of intact and unchanged copies * of SOFA source code files is a "derived work" that must comply * with the following requirements: * * a) Your work shall be marked or carry a statement that it * (i) uses routines and computations derived by you from * software provided by SOFA under license to you; and * (ii) does not itself constitute software provided by and/or * endorsed by SOFA. * * b) The source code of your derived work must contain descriptions * of how the derived work is based upon, contains and/or differs * from the original SOFA software. * * c) The names of all routines in your derived work shall not * include the prefix "iau" or "sofa" or trivial modifications * thereof such as changes of case. * * d) The origin of the SOFA components of your derived work must * not be misrepresented; you must not claim that you wrote the * original software, nor file a patent application for SOFA * software or algorithms embedded in the SOFA software. * * e) These requirements must be reproduced intact in any source * distribution and shall apply to anyone to whom you have * granted a further right to modify the source code of your * derived work. * * Note that, as originally distributed, the SOFA software is * intended to be a definitive implementation of the IAU standards, * and consequently third-party modifications are discouraged. All * variations, no matter how minor, must be explicitly marked as * such, as explained above. * * 4. You shall not cause the SOFA software to be brought into * disrepute, either by misuse, or use for inappropriate tasks, or * by inappropriate modification. * * 5. The SOFA software is provided "as is" and SOFA makes no warranty * as to its use or performance. SOFA does not and cannot warrant * the performance or results which the user may obtain by using the * SOFA software. SOFA makes no warranties, express or implied, as * to non-infringement of third party rights, merchantability, or * fitness for any particular purpose. In no event will SOFA be * liable to the user for any consequential, incidental, or special * damages, including any lost profits or lost savings, even if a * SOFA representative has been advised of such damages, or for any * claim by any third party. * * 6. The provision of any version of the SOFA software under the terms * and conditions specified herein does not imply that future * versions will also be made available under the same terms and * conditions. * * In any published work or commercial product which uses the SOFA * software directly, acknowledgement (see www.iausofa.org) is * appreciated. * * Correspondence concerning SOFA software should be addressed as * follows: * * By email: sofa@ukho.gov.uk * By post: IAU SOFA Center * HM Nautical Almanac Office * UK Hydrographic Office * Admiralty Way, Taunton * Somerset, TA1 2DN * United Kingdom * *----------------------------------------------------------------------- END