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107 lines
3.0 KiB
Fortran
107 lines
3.0 KiB
Fortran
SUBROUTINE sla_DD2TF (NDP, DAYS, SIGN, IHMSF)
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*+
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* - - - - - -
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* D D 2 T F
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* - - - - - -
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*
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* Convert an interval in days into hours, minutes, seconds
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* (double precision)
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*
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* Given:
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* NDP i number of decimal places of seconds
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* DAYS d interval in days
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*
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* Returned:
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* SIGN c '+' or '-'
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* IHMSF i(4) hours, minutes, seconds, fraction
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*
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* Notes:
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*
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* 1) NDP less than zero is interpreted as zero.
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*
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* 2) The largest useful value for NDP is determined by the size
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* of DAYS, the format of DOUBLE PRECISION floating-point numbers
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* on the target machine, and the risk of overflowing IHMSF(4).
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* On some architectures, for DAYS up to 1D0, the available
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* floating-point precision corresponds roughly to NDP=12.
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* However, the practical limit is NDP=9, set by the capacity of
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* a typical 32-bit IHMSF(4).
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*
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* 3) The absolute value of DAYS may exceed 1D0. In cases where it
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* does not, it is up to the caller to test for and handle the
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* case where DAYS is very nearly 1D0 and rounds up to 24 hours,
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* by testing for IHMSF(1)=24 and setting IHMSF(1-4) to zero.
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*
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* Last revision: 26 December 2004
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*
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* Copyright P.T.Wallace. All rights reserved.
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*
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* License:
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (see SLA_CONDITIONS); if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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*-
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IMPLICIT NONE
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INTEGER NDP
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DOUBLE PRECISION DAYS
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CHARACTER SIGN*(*)
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INTEGER IHMSF(4)
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* Days to seconds
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DOUBLE PRECISION D2S
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PARAMETER (D2S=86400D0)
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INTEGER NRS,N
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DOUBLE PRECISION RS,RM,RH,A,AH,AM,AS,AF
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* Handle sign
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IF (DAYS.GE.0D0) THEN
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SIGN='+'
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ELSE
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SIGN='-'
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END IF
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* Field units in terms of least significant figure
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NRS=1
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DO N=1,NDP
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NRS=NRS*10
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END DO
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RS=DBLE(NRS)
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RM=RS*60D0
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RH=RM*60D0
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* Round interval and express in smallest units required
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A=ANINT(RS*D2S*ABS(DAYS))
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* Separate into fields
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AH=AINT(A/RH)
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A=A-AH*RH
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AM=AINT(A/RM)
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A=A-AM*RM
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AS=AINT(A/RS)
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AF=A-AS*RS
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* Return results
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IHMSF(1)=MAX(NINT(AH),0)
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IHMSF(2)=MAX(MIN(NINT(AM),59),0)
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IHMSF(3)=MAX(MIN(NINT(AS),59),0)
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IHMSF(4)=MAX(NINT(MIN(AF,RS-1D0)),0)
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END
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