7066: fix our algorithm based on jewish.c in sdn
It looks like we had an earlier fork of the same code, and the upstream had some bugs fixed. svn: r23131
This commit is contained in:
Vassilii Khachaturov
parent
dcf62ff1d9
commit
1cba16a406
@ -45,14 +45,15 @@ _JLN_SDN_OFFSET = 32083
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_JLN_DAYS_PER_5_MONTHS = 153
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_JLN_DAYS_PER_4_YEARS = 1461
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_HBR_HALAKIM_PER_HOUR = 1080
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_HBR_HALAKIM_PER_DAY = 25920
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_HBR_HALAKIM_PER_LUNAR_CYCLE = 765433
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_HBR_HALAKIM_PER_METONIC_CYCLE = 179876755
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_HBR_HALAKIM_PER_LUNAR_CYCLE = 29 * _HBR_HALAKIM_PER_DAY + 13753
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_HBR_HALAKIM_PER_METONIC_CYCLE = _HBR_HALAKIM_PER_LUNAR_CYCLE * (12 * 19 + 7)
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_HBR_SDN_OFFSET = 347997
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_HBR_NEW_MOON_OF_CREATION = 31524
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_HBR_NOON = 19440
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_HBR_AM3_11_20 = 9924
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_HBR_AM9_32_43 = 16789
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_HBR_NOON = 18 * _HBR_HALAKIM_PER_HOUR
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_HBR_AM3_11_20 = (9 * _HBR_HALAKIM_PER_HOUR) + 204
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_HBR_AM9_32_43 = (15 * _HBR_HALAKIM_PER_HOUR) + 589
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_HBR_SUNDAY = 0
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_HBR_MONDAY = 1
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@ -122,9 +123,9 @@ def _tishri_molad(input_day):
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# really quite close.
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while molad_day < (input_day - 6940 + 310):
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metonic_cycle = metonic_cycle + 1
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molad_halakim = molad_halakim + _HBR_HALAKIM_PER_METONIC_CYCLE
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molad_day = molad_day + ( molad_halakim // _HBR_HALAKIM_PER_DAY)
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metonic_cycle += 1
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molad_halakim += _HBR_HALAKIM_PER_METONIC_CYCLE
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molad_day += molad_halakim // _HBR_HALAKIM_PER_DAY
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molad_halakim = molad_halakim % _HBR_HALAKIM_PER_DAY
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# Find the molad of Tishri closest to this date.
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@ -133,12 +134,11 @@ def _tishri_molad(input_day):
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if molad_day > input_day - 74:
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break
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molad_halakim = molad_halakim + (_HBR_HALAKIM_PER_LUNAR_CYCLE
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* _HBR_MONTHS_PER_YEAR[metonic_year])
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molad_day = molad_day + (molad_halakim // _HBR_HALAKIM_PER_DAY)
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molad_halakim += (_HBR_HALAKIM_PER_LUNAR_CYCLE
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* _HBR_MONTHS_PER_YEAR[metonic_year])
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molad_day += molad_halakim // _HBR_HALAKIM_PER_DAY
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molad_halakim = molad_halakim % _HBR_HALAKIM_PER_DAY
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else:
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metonic_year += 1
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return (metonic_cycle, metonic_year, molad_day, molad_halakim)
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def _molad_of_metonic_cycle(metonic_cycle):
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@ -161,10 +161,10 @@ def _molad_of_metonic_cycle(metonic_cycle):
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# will be in d1.
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d2 = r2 // _HBR_HALAKIM_PER_DAY
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r2 = r2 - (d2 * _HBR_HALAKIM_PER_DAY)
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r2 -= d2 * _HBR_HALAKIM_PER_DAY
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r1 = (r2 << 16) | (r1 & 0xFFFF)
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d1 = r1 // _HBR_HALAKIM_PER_DAY
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r1 = r1 - ( d1 * _HBR_HALAKIM_PER_DAY)
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r1 -= d1 * _HBR_HALAKIM_PER_DAY
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molad_day = (d2 << 16) | d1
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molad_halakim = r1
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@ -264,6 +264,7 @@ def hebrew_ymd(sdn):
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"""Convert an SDN number to a Julian calendar date."""
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input_day = sdn - _HBR_SDN_OFFSET
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# TODO if input_day <= 0, the result is a date invalid in Hebrew calendar!
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(metonic_cycle, metonic_year, day, halakim) = _tishri_molad(input_day)
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tishri1 = _tishri1(metonic_year, day, halakim)
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@ -284,9 +285,9 @@ def hebrew_ymd(sdn):
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# We need the length of the year to figure this out, so find
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# Tishri 1 of the next year.
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halakim = halakim + (_HBR_HALAKIM_PER_LUNAR_CYCLE
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* _HBR_MONTHS_PER_YEAR[metonic_year])
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day = day + (halakim // _HBR_HALAKIM_PER_DAY)
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halakim += (_HBR_HALAKIM_PER_LUNAR_CYCLE
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* _HBR_MONTHS_PER_YEAR[metonic_year])
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day += halakim // _HBR_HALAKIM_PER_DAY
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halakim = halakim % _HBR_HALAKIM_PER_DAY
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tishri1_after = _tishri1((metonic_year + 1) % 19, day, halakim)
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else:
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@ -320,24 +321,24 @@ def hebrew_ymd(sdn):
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day = input_day - tishri1 + 207
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if day > 0:
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return (year, month, day)
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month = month - 1
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day = day + 30
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month -= 1
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day += 30
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if day > 0:
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return (year, month, day)
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month = month - 1
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day = day + 30
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month -= 1
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day += 30
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else:
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month = 6
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day = input_day - tishri1 + 207
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if day > 0:
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return (year, month, day)
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month = month - 1
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day = day + 30
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month -= 1
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day += 30
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if day > 0:
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return (year, month, day)
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month = month - 1
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day = day + 29
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month -= 1
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day += 29
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if day > 0:
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return (year, month, day)
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@ -348,25 +349,23 @@ def hebrew_ymd(sdn):
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tishri1 = _tishri1(metonic_year, day, halakim)
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year_length = tishri1_after - tishri1
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cday = input_day - tishri1 - 29
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day = input_day - tishri1 - 29
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if year_length == 355 or year_length == 385 :
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# Heshvan has 30 days
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if day <= 30:
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month = 2
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day = cday
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return (year, month, day)
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day = day - 30
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day -= 30
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else:
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# Heshvan has 29 days
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if day <= 29:
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month = 2
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day = cday
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return (year, month, day)
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cday = cday - 29
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day -= 29
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# It has to be Kislev
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return (year, 3, cday)
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return (year, 3, day)
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def julian_sdn(year, month, day):
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"""Convert a Julian calendar date to an SDN number."""
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@ -573,3 +572,16 @@ def swedish_ymd(sdn):
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return gregorian_ymd(sdn)
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else:
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return julian_ymd(sdn)
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try:
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import sdn
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hebrew_ymd = sdn.SdnToJewish # Fix bug# 7066
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hebrew_sdn = sdn.JewishToSdn
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#TODO maybe alias the other local invented wheels to Calendar convertors
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except ImportError:
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import logging
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LOG = logging.getLogger(".calendar")
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LOG.warn("sdn not available. "
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"Install Calendar with pypi for native Hebrew calendar calculations.")
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