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.help calyd Jun99 "Slalib Package"
.nf
SUBROUTINE slCAYD (IY, IM, ID, NY, ND, J)
- - - - - -
C A Y D
- - - - - -
Gregorian calendar date to year and day in year (in a Julian
calendar aligned to the 20th/21st century Gregorian calendar).
(Includes century default feature: use slCLYD for years
before 100AD.)
Given:
IY,IM,ID int year, month, day in Gregorian calendar
(year may optionally omit the century)
Returned:
NY int year (re-aligned Julian calendar)
ND int day in year (1 = January 1st)
J int status:
0 = OK
1 = bad year (before -4711)
2 = bad month
3 = bad day (but conversion performed)
Notes:
1 This routine exists to support the low-precision routines
slERTH, slMOON and slECOR.
2 Between 1900 March 1 and 2100 February 28 it returns answers
which are consistent with the ordinary Gregorian calendar.
Outside this range there will be a discrepancy which increases
by one day for every non-leap century year.
3 Years in the range 50-99 are interpreted as 1950-1999, and
years in the range 00-49 are interpreted as 2000-2049.
Called: slCLYD
P.T.Wallace Starlink 23 November 1994
Copyright (C) 1995 Rutherford Appleton Laboratory
Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
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