#include "erfa.h" #include int eraDtf2d(const char *scale, int iy, int im, int id, int ihr, int imn, double sec, double *d1, double *d2) /* ** - - - - - - - - - ** e r a D t f 2 d ** - - - - - - - - - ** ** Encode date and time fields into 2-part Julian Date (or in the case ** of UTC a quasi-JD form that includes special provision for leap ** seconds). ** ** Given: ** scale char[] time scale ID (Note 1) ** iy,im,id int year, month, day in Gregorian calendar (Note 2) ** ihr,imn int hour, minute ** sec double seconds ** ** Returned: ** d1,d2 double 2-part Julian Date (Notes 3,4) ** ** Returned (function value): ** int status: +3 = both of next two ** +2 = time is after end of day (Note 5) ** +1 = dubious year (Note 6) ** 0 = OK ** -1 = bad year ** -2 = bad month ** -3 = bad day ** -4 = bad hour ** -5 = bad minute ** -6 = bad second (<0) ** ** Notes: ** ** 1) scale identifies the time scale. Only the value "UTC" (in upper ** case) is significant, and enables handling of leap seconds (see ** Note 4). ** ** 2) For calendar conventions and limitations, see eraCal2jd. ** ** 3) The sum of the results, d1+d2, is Julian Date, where normally d1 ** is the Julian Day Number and d2 is the fraction of a day. In the ** case of UTC, where the use of JD is problematical, special ** conventions apply: see the next note. ** ** 4) JD cannot unambiguously represent UTC during a leap second unless ** special measures are taken. The ERFA internal convention is that ** the quasi-JD day represents UTC days whether the length is 86399, ** 86400 or 86401 SI seconds. In the 1960-1972 era there were ** smaller jumps (in either direction) each time the linear UTC(TAI) ** expression was changed, and these "mini-leaps" are also included ** in the ERFA convention. ** ** 5) The warning status "time is after end of day" usually means that ** the sec argument is greater than 60.0. However, in a day ending ** in a leap second the limit changes to 61.0 (or 59.0 in the case ** of a negative leap second). ** ** 6) The warning status "dubious year" flags UTCs that predate the ** introduction of the time scale or that are too far in the future ** to be trusted. See eraDat for further details. ** ** 7) Only in the case of continuous and regular time scales (TAI, TT, ** TCG, TCB and TDB) is the result d1+d2 a Julian Date, strictly ** speaking. In the other cases (UT1 and UTC) the result must be ** used with circumspection; in particular the difference between ** two such results cannot be interpreted as a precise time ** interval. ** ** Called: ** eraCal2jd Gregorian calendar to JD ** eraDat delta(AT) = TAI-UTC ** eraJd2cal JD to Gregorian calendar ** ** Copyright (C) 2013-2017, NumFOCUS Foundation. ** Derived, with permission, from the SOFA library. See notes at end of file. */ { int js, iy2, im2, id2; double dj, w, day, seclim, dat0, dat12, dat24, dleap, time; /* Today's Julian Day Number. */ js = eraCal2jd(iy, im, id, &dj, &w); if ( js ) return js; dj += w; /* Day length and final minute length in seconds (provisional). */ day = ERFA_DAYSEC; seclim = 60.0; /* Deal with the UTC leap second case. */ if ( ! strcmp(scale,"UTC") ) { /* TAI-UTC at 0h today. */ js = eraDat(iy, im, id, 0.0, &dat0); if ( js < 0 ) return js; /* TAI-UTC at 12h today (to detect drift). */ js = eraDat(iy, im, id, 0.5, &dat12); if ( js < 0 ) return js; /* TAI-UTC at 0h tomorrow (to detect jumps). */ js = eraJd2cal ( dj, 1.5, &iy2, &im2, &id2, &w); if ( js ) return js; js = eraDat(iy2, im2, id2, 0.0, &dat24); if ( js < 0 ) return js; /* Any sudden change in TAI-UTC between today and tomorrow. */ dleap = dat24 - (2.0*dat12 - dat0); /* If leap second day, correct the day and final minute lengths. */ day += dleap; if ( ihr == 23 && imn == 59 ) seclim += dleap; /* End of UTC-specific actions. */ } /* Validate the time. */ if ( ihr >= 0 && ihr <= 23 ) { if ( imn >= 0 && imn <= 59 ) { if ( sec >= 0 ) { if ( sec >= seclim ) { js += 2; } } else { js = -6; } } else { js = -5; } } else { js = -4; } if ( js < 0 ) return js; /* The time in days. */ time = ( 60.0 * ( (double) ( 60 * ihr + imn ) ) + sec ) / day; /* Return the date and time. */ *d1 = dj; *d2 = time; /* Status. */ return js; } /*---------------------------------------------------------------------- ** ** ** Copyright (C) 2013-2017, NumFOCUS Foundation. ** All rights reserved. ** ** This library is derived, with permission, from the International ** Astronomical Union's "Standards of Fundamental Astronomy" library, ** available from http://www.iausofa.org. ** ** The ERFA version is intended to retain identical functionality to ** the SOFA library, but made distinct through different function and ** file names, as set out in the SOFA license conditions. The SOFA ** original has a role as a reference standard for the IAU and IERS, ** and consequently redistribution is permitted only in its unaltered ** state. The ERFA version is not subject to this restriction and ** therefore can be included in distributions which do not support the ** concept of "read only" software. ** ** Although the intent is to replicate the SOFA API (other than ** replacement of prefix names) and results (with the exception of ** bugs; any that are discovered will be fixed), SOFA is not ** responsible for any errors found in this version of the library. ** ** If you wish to acknowledge the SOFA heritage, please acknowledge ** that you are using a library derived from SOFA, rather than SOFA ** itself. ** ** ** TERMS AND CONDITIONS ** ** Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions ** are met: ** ** 1 Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** ** 2 Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in ** the documentation and/or other materials provided with the ** distribution. ** ** 3 Neither the name of the Standards Of Fundamental Astronomy Board, ** the International Astronomical Union nor the names of its ** contributors may be used to endorse or promote products derived ** from this software without specific prior written permission. ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE ** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, ** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; ** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER ** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ** POSSIBILITY OF SUCH DAMAGE. ** */