SUBROUTINE iau_D2TF ( NDP, DAYS, SIGN, IHMSF ) *+ * - - - - - - - - - * i a u _ D 2 T F * - - - - - - - - - * * Decompose days to hours, minutes, seconds, fraction. * * This routine is part of the International Astronomical Union's * SOFA (Standards of Fundamental Astronomy) software collection. * * Status: vector/matrix support routine. * * Given: * NDP i resolution (Note 1) * DAYS d interval in days * * Returned: * SIGN c '+' or '-' * IHMSF i(4) hours, minutes, seconds, fraction * * Notes: * * 1) NDP is interpreted as follows: * * NDP resolution * : ...0000 00 00 * -7 1000 00 00 * -6 100 00 00 * -5 10 00 00 * -4 1 00 00 * -3 0 10 00 * -2 0 01 00 * -1 0 00 10 * 0 0 00 01 * 1 0 00 00.1 * 2 0 00 00.01 * 3 0 00 00.001 * : 0 00 00.000... * * 2) The largest +ve useful value for NDP is determined by the size * of DAYS, the format of DOUBLE PRECISION floating-point numbers * on the target platform, and the risk of overflowing IHMSF(4). * On a typical platform, for DAYS up to 1D0, the available * floating-point precision might correspond to NDP=12. However, * the practical limit is typically NDP=9, set by the capacity of * a 32-bit IHMSF(4). * * 3) The absolute value of DAYS may exceed 1D0. In cases where it * does not, it is up to the caller to test for and handle the * case where DAYS is very nearly 1D0 and rounds up to 24 hours, * by testing for IHMSF(1)=24 and setting IHMSF(1-4) to zero. * * This revision: 2000 December 18 * * Copyright (C) 2001 IAU SOFA Review Board. See notes at end. * *----------------------------------------------------------------------- IMPLICIT NONE INTEGER NDP DOUBLE PRECISION DAYS CHARACTER SIGN*(*) INTEGER IHMSF(4) * Days to seconds DOUBLE PRECISION D2S PARAMETER ( D2S = 86400D0 ) INTEGER NRS, N DOUBLE PRECISION RS, RM, RH, A, AH, AM, AS, AF * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - * Handle sign. IF ( DAYS .GE. 0D0 ) THEN SIGN = '+' ELSE SIGN = '-' END IF * Interval in seconds. A = D2S * ABS(DAYS) * Pre-round if resolution coarser than 1 second (then pretend NDP=1). IF ( NDP .LT. 0 ) THEN NRS = 1 DO 1 N=1,-NDP IF ( N.EQ.2 .OR. N.EQ.4 ) THEN NRS = NRS * 6 ELSE NRS = NRS * 10 END IF 1 CONTINUE RS = DBLE(NRS) A = RS * ANINT(A/RS) END IF * Express the unit of each field in resolution units. NRS = 1 DO 2 N=1,NDP NRS = NRS * 10 2 CONTINUE RS = DBLE(NRS) RM = RS * 60D0 RH = RM * 60D0 * Round the interval and express in resolution units. A = ANINT(RS*A) * Break into fields. AH = AINT(A/RH) A = A - AH*RH AM = AINT(A/RM) A = A - AM*RM AS = AINT(A/RS) AF = A - AS*RS * Return results. IHMSF(1) = NINT(AH) IHMSF(2) = NINT(AM) IHMSF(3) = NINT(AS) IHMSF(4) = NINT(AF) * Finished. *+---------------------------------------------------------------------- * * Copyright (C) 2001 * Standards Of Fundamental Astronomy Review Board * of the International Astronomical Union. * * ===================== * SOFA Software License * ===================== * * NOTICE TO USER: * * BY USING THIS SOFTWARE YOU ACCEPT THE FOLLOWING TERMS AND CONDITIONS * WHICH APPLY TO ITS USE. * * 1. The Software is owned by the IAU SOFA Review Board ("the Board"). * * 2. The Software is made available free of charge for use by: * * a) private individuals for non-profit research; and * * b) non-profit educational, academic and research institutions. * * 3. Commercial use of the Software is specifically excluded from the * terms and conditions of this license. Commercial use of the * Software is subject to the prior written agreement of the Board on * terms to be agreed. * * 4. The provision of any version of the 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. * * 5. The user may modify the Software for his/her own purposes. The * user may distribute the modified software provided that the Board * is informed and that a copy of the modified software is made * available to the Board on request. All modifications made by the * user shall be clearly identified to show how the modified software * differs from the original Software, and the name(s) of the * affected routine(s) shall be changed. The original SOFA Software * License text must be present. * * 6. In any published work produced by the user and which includes * results achieved by using the Software, the user shall acknowledge * that the Software was used in producing the information contained * in such publication. * * 7. The user may incorporate or embed the Software into other software * products which he/she may then give away free of charge but not * sell provided the user makes due acknowledgement of the use which * he/she has made of the Software in creating such software * products. Any redistribution of the Software in this way shall be * made under the same terms and conditions under which the user * received it from the SOFA Center. * * 8. The user shall not cause the Software to be brought into * disrepute, either by misuse, or use for inappropriate tasks, or by * inappropriate modification. * * 9. The Software is provided to the user "as is" and the Board makes * no warranty as to its use or performance. The Board does not and * cannot warrant the performance or results which the user may * obtain by using the Software. The Board 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 the Board be liable to the user for any consequential, * incidental, or special damages, including any lost profits or lost * savings, even if a Board representative has been advised of such * damages, or for any claim by any third party. * * Correspondence concerning SOFA software should be addressed as * follows: * * Internet email: sofa@rl.ac.uk * Postal address: IAU SOFA Center * Rutherford Appleton Laboratory * Chilton, Didcot, Oxon OX11 0QX * United Kingdom * * *----------------------------------------------------------------------- END