71 lines
2.3 KiB
Python
71 lines
2.3 KiB
Python
import datetime
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def g2m(date, gtm_correlation=True):
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"""
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Translates Gregorian date into Mayan date, see
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https://rosettacode.org/wiki/Mayan_calendar
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Input arguments:
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date: string date in ISO-8601 format: YYYY-MM-DD
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gtm_correlation: GTM correlation to apply if True, Astronomical correlation otherwise (optional, True by default)
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Output arguments:
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long_date: Mayan date in Long Count system as string
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round_date: Mayan date in Calendar Round system as string
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"""
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# define some parameters and names
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correlation = 584283 if gtm_correlation else 584285
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long_count_days = [144000, 7200, 360, 20, 1]
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tzolkin_months = ['Imix’', 'Ik’', 'Ak’bal', 'K’an', 'Chikchan', 'Kimi', 'Manik’', 'Lamat', 'Muluk', 'Ok', 'Chuwen',
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'Eb', 'Ben', 'Hix', 'Men', 'K’ib’', 'Kaban', 'Etz’nab’', 'Kawak', 'Ajaw'] # tzolk'in
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haad_months = ['Pop', 'Wo’', 'Sip', 'Sotz’', 'Sek', 'Xul', 'Yaxk’in', 'Mol', 'Ch’en', 'Yax', 'Sak’', 'Keh', 'Mak',
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'K’ank’in', 'Muwan', 'Pax', 'K’ayab', 'Kumk’u', 'Wayeb’'] # haab'
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gregorian_days = datetime.datetime.strptime(date, '%Y-%m-%d').toordinal()
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julian_days = gregorian_days + 1721425
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# 1. calculate long count date
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long_date = list()
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remainder = julian_days - correlation
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for days in long_count_days:
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result, remainder = divmod(remainder, days)
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long_date.append(int(result))
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long_date = '.'.join(['{:02d}'.format(d) for d in long_date])
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# 2. calculate round calendar date
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tzolkin_month = (julian_days + 16) % 20
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tzolkin_day = ((julian_days + 5) % 13) + 1
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haab_month = int(((julian_days + 65) % 365) / 20)
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haab_day = ((julian_days + 65) % 365) % 20
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haab_day = haab_day if haab_day else 'Chum'
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lord_number = (julian_days - correlation) % 9
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lord_number = lord_number if lord_number else 9
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round_date = f'{tzolkin_day} {tzolkin_months[tzolkin_month]} {haab_day} {haad_months[haab_month]} G{lord_number}'
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return long_date, round_date
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if __name__ == '__main__':
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dates = ['2004-06-19', '2012-12-18', '2012-12-21', '2019-01-19', '2019-03-27', '2020-02-29', '2020-03-01']
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for date in dates:
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long, round = g2m(date)
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print(date, long, round)
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