Mayan calendar: Difference between revisions

</pre>

=={{header|Python}}==

{{works with|Python|3.6}}

<lang python>

import datetime

def g2m(date, gtm_correlation=True):

"""

Translates Gregorian date into Mayan date, see

https://rosettacode.org/wiki/Mayan_calendar

Input arguments:

date: string date in ISO-8601 format: YYYY-MM-DD

gtm_correlation: GTM correlation to apply if True, Astronomical correlation otherwise (optional, True by default)

Output arguments:

long_date: Mayan date in Long Count system as string

round_date: Mayan date in Calendar Round system as string

"""

# define some parameters and names

correlation = 584283 if gtm_correlation else 584285

long_count_days = [144000, 7200, 360, 20, 1]

tzolkin_months = ['Imix’', 'Ik’', 'Ak’bal', 'K’an', 'Chikchan', 'Kimi', 'Manik’', 'Lamat', 'Muluk', 'Ok', 'Chuwen',

'Eb', 'Ben', 'Hix', 'Men', 'K’ib’', 'Kaban', 'Etz’nab’', 'Kawak', 'Ajaw'] # tzolk'in

haad_months = ['Pop', 'Wo’', 'Sip', 'Sotz’', 'Sek', 'Xul', 'Yaxk’in', 'Mol', 'Ch’en', 'Yax', 'Sak’', 'Keh', 'Mak',

'K’ank’in', 'Muwan', 'Pax', 'K’ayab', 'Kumk’u', 'Wayeb’'] # haab'

gregorian_days = datetime.datetime.strptime(date, '%Y-%m-%d').toordinal()

julian_days = gregorian_days + 1721425

# 1. calculate long count date

long_date = list()

remainder = julian_days - correlation

for days in long_count_days:

result, remainder = divmod(remainder, days)

long_date.append(int(result))

long_date = '.'.join(['{:02d}'.format(d) for d in long_date])

# 2. calculate round calendar date

tzolkin_month = (julian_days + 16) % 20

tzolkin_day = ((julian_days + 5) % 13) + 1

haab_month = int(((julian_days + 65) % 365) / 20)

haab_day = ((julian_days + 65) % 365) % 20

haab_day = haab_day if haab_day else 'Chum'

lord_number = (julian_days - correlation) % 9

lord_number = lord_number if lord_number else 9

round_date = f'{tzolkin_day} {tzolkin_months[tzolkin_month]} {haab_day} {haad_months[haab_month]} G{lord_number}'

return long_date, round_date

if __name__ == '__main__':

dates = ['2004-06-19', '2012-12-18', '2012-12-21', '2019-01-19', '2019-03-27', '2020-02-29', '2020-03-01']

for date in dates:

long, round = g2m(date)

print(date, long, round)

</lang>

{{out}}

<pre>

2004-06-19 12.19.11.06.13 4 Ben 16 Sotz’ G7

2012-12-18 12.19.19.17.17 1 Kaban Chum K’ank’in G6

2012-12-21 13.00.00.00.00 4 Ajaw 3 K’ank’in G9

2019-01-19 13.00.06.03.00 1 Ajaw 13 Muwan G6

2019-03-27 13.00.06.06.07 3 Manik’ Chum Wayeb’ G1

2020-02-29 13.00.07.05.06 4 Kimi 14 K’ayab G7

2020-03-01 13.00.07.05.07 5 Manik’ 15 K’ayab G8