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diff --git a/ext/calendar/julian.c b/ext/calendar/julian.c
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-/* $selId: julian.c,v 2.0 1995/10/24 01:13:06 lees Exp $
- * Copyright 1993-1995, Scott E. Lee, all rights reserved.
- * Permission granted to use, copy, modify, distribute and sell so long as
- * the above copyright and this permission statement are retained in all
- * copies.  THERE IS NO WARRANTY - USE AT YOUR OWN RISK.
- */
-
-/**************************************************************************
- *
- * These are the externally visible components of this file:
- *
- *     void
- *     SdnToJulian(
- *         long int  sdn,
- *         int      *pYear,
- *         int      *pMonth,
- *         int      *pDay);
- *
- * Convert a SDN to a Julian calendar date.  If the input SDN is less than
- * 1, the three output values will all be set to zero, otherwise *pYear
- * will be >= -4713 and != 0; *pMonth will be in the range 1 to 12
- * inclusive; *pDay will be in the range 1 to 31 inclusive.
- *
- *     long int
- *     JulianToSdn(
- *         int inputYear,
- *         int inputMonth,
- *         int inputDay);
- *
- * Convert a Julian calendar date to a SDN.  Zero is returned when the
- * input date is detected as invalid or out of the supported range.  The
- * return value will be > 0 for all valid, supported dates, but there are
- * some invalid dates that will return a positive value.  To verify that a
- * date is valid, convert it to SDN and then back and compare with the
- * original.
- *
- * VALID RANGE
- *
- *     4713 B.C. to at least 10000 A.D.
- *
- *     Although this software can handle dates all the way back to 4713
- *     B.C., such use may not be meaningful.  The calendar was created in
- *     46 B.C., but the details did not stabilize until at least 8 A.D.,
- *     and perhaps as late at the 4th century.  Also, the beginning of a
- *     year varied from one culture to another - not all accepted January
- *     as the first month.
- *
- * CALENDAR OVERVIEW
- *
- *     Julias Ceasar created the calendar in 46 B.C. as a modified form of
- *     the old Roman republican calendar which was based on lunar cycles.
- *     The new Julian calendar set fixed lengths for the months, abandoning
- *     the lunar cycle.  It also specified that there would be exactly 12
- *     months per year and 365.25 days per year with every 4th year being a
- *     leap year.
- *
- *     Note that the current accepted value for the tropical year is
- *     365.242199 days, not 365.25.  This lead to an 11 day shift in the
- *     calendar with respect to the seasons by the 16th century when the
- *     Gregorian calendar was created to replace the Julian calendar.
- *
- *     The difference between the Julian and today's Gregorian calendar is
- *     that the Gregorian does not make centennial years leap years unless
- *     they are a multiple of 400, which leads to a year of 365.2425 days.
- *     In other words, in the Gregorian calendar, 1700, 1800 and 1900 are
- *     not leap years, but 2000 is.  All centennial years are leap years in
- *     the Julian calendar.
- *
- *     The details are unknown, but the lengths of the months were adjusted
- *     until they finally stablized in 8 A.D. with their current lengths:
- *
- *         January          31
- *         February         28/29
- *         March            31
- *         April            30
- *         May              31
- *         June             30
- *         Quintilis/July   31
- *         Sextilis/August  31
- *         September        30
- *         October          31
- *         November         30
- *         December         31
- *
- *     In the early days of the calendar, the days of the month were not
- *     numbered as we do today.  The numbers ran backwards (decreasing) and
- *     were counted from the Ides (15th of the month - which in the old
- *     Roman republican lunar calendar would have been the full moon) or
- *     from the Nonae (9th day before the Ides) or from the beginning of
- *     the next month.
- *
- *     In the early years, the beginning of the year varied, sometimes
- *     based on the ascension of rulers.  It was not always the first of
- *     January.
- *
- *     Also, today's epoch, 1 A.D. or the birth of Jesus Christ, did not
- *     come into use until several centuries later when Christianity became
- *     a dominant religion.
- *
- * ALGORITHMS
- *
- *     The calculations are based on two different cycles: a 4 year cycle
- *     of leap years and a 5 month cycle of month lengths.
- *
- *     The 5 month cycle is used to account for the varying lengths of
- *     months.  You will notice that the lengths alternate between 30 and
- *     31 days, except for three anomalies: both July and August have 31
- *     days, both December and January have 31, and February is less than
- *     30.  Starting with March, the lengths are in a cycle of 5 months
- *     (31, 30, 31, 30, 31):
- *
- *         Mar   31 days  \
- *         Apr   30 days   |
- *         May   31 days    > First cycle
- *         Jun   30 days   |
- *         Jul   31 days  /
- *
- *         Aug   31 days  \
- *         Sep   30 days   |
- *         Oct   31 days    > Second cycle
- *         Nov   30 days   |
- *         Dec   31 days  /
- *
- *         Jan   31 days  \
- *         Feb 28/9 days   |
- *                          > Third cycle (incomplete)
- *
- *     For this reason the calculations (internally) assume that the year
- *     starts with March 1.
- *
- * TESTING
- *
- *     This algorithm has been tested from the year 4713 B.C. to 10000 A.D.
- *     The source code of the verification program is included in this
- *     package.
- *
- * REFERENCES
- *
- *     Conversions Between Calendar Date and Julian Day Number by Robert J.
- *     Tantzen, Communications of the Association for Computing Machinery
- *     August 1963.  (Also published in Collected Algorithms from CACM,
- *     algorithm number 199).  [Note: the published algorithm is for the
- *     Gregorian calendar, but was adjusted to use the Julian calendar's
- *     simpler leap year rule.]
- *
- **************************************************************************/
-
-#include "sdncal.h"
-
-#define JULIAN_SDN_OFFSET         32083
-#define DAYS_PER_5_MONTHS  153
-#define DAYS_PER_4_YEARS   1461
-
-void SdnToJulian(
-					long int sdn,
-					int *pYear,
-					int *pMonth,
-					int *pDay)
-{
-	int year;
-	int month;
-	int day;
-	long int temp;
-	int dayOfYear;
-
-	if (sdn <= 0) {
-		*pYear = 0;
-		*pMonth = 0;
-		*pDay = 0;
-		return;
-	}
-	temp = (sdn + JULIAN_SDN_OFFSET) * 4 - 1;
-
-	/* Calculate the year and day of year (1 <= dayOfYear <= 366). */
-	year = temp / DAYS_PER_4_YEARS;
-	dayOfYear = (temp % DAYS_PER_4_YEARS) / 4 + 1;
-
-	/* Calculate the month and day of month. */
-	temp = dayOfYear * 5 - 3;
-	month = temp / DAYS_PER_5_MONTHS;
-	day = (temp % DAYS_PER_5_MONTHS) / 5 + 1;
-
-	/* Convert to the normal beginning of the year. */
-	if (month < 10) {
-		month += 3;
-	} else {
-		year += 1;
-		month -= 9;
-	}
-
-	/* Adjust to the B.C./A.D. type numbering. */
-	year -= 4800;
-	if (year <= 0)
-		year--;
-
-	*pYear = year;
-	*pMonth = month;
-	*pDay = day;
-}
-
-long int JulianToSdn(
-						int inputYear,
-						int inputMonth,
-						int inputDay)
-{
-	int year;
-	int month;
-
-	/* check for invalid dates */
-	if (inputYear == 0 || inputYear < -4713 ||
-		inputMonth <= 0 || inputMonth > 12 ||
-		inputDay <= 0 || inputDay > 31) {
-		return (0);
-	}
-	/* check for dates before SDN 1 (Jan 2, 4713 B.C.) */
-	if (inputYear == -4713) {
-		if (inputMonth == 1 && inputDay == 1) {
-			return (0);
-		}
-	}
-	/* Make year always a positive number. */
-	if (inputYear < 0) {
-		year = inputYear + 4801;
-	} else {
-		year = inputYear + 4800;
-	}
-
-	/* Adjust the start of the year. */
-	if (inputMonth > 2) {
-		month = inputMonth - 3;
-	} else {
-		month = inputMonth + 9;
-		year--;
-	}
-
-	return ((year * DAYS_PER_4_YEARS) / 4
-			+ (month * DAYS_PER_5_MONTHS + 2) / 5
-			+ inputDay
-			- JULIAN_SDN_OFFSET);
-}
-
-/*
- * Local variables:
- * tab-width: 4
- * c-basic-offset: 4
- * End:
- * vim600: sw=4 ts=4 fdm=marker
- * vim<600: sw=4 ts=4
- */