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japanese.py
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#!/usr/bin/python3
#
# Convert between the Gregorian Calendar and Julian Day
#
import months
cycle4 = (4 * 365) + 1
cycle100 = (100 * 365) + 24
cycle400 = (400 * 365) + 97
epoch = 1480366
def tojd(day, month, year):
day = int(day)
month = month.title()
year = int(year)
jday = epoch
if year > 0:
# positive dates
y = 1
cycles = (year - y) // 400
y += (400 * cycles)
jday += (cycles * cycle400)
while y < year:
if year - y > 400:
y += 400
jday += cycle400
elif year - y > 100:
y += 100
jday += cycle100
elif year - y > 4:
y += 4
jday += cycle4
elif y % 400 == 260:
y += 1
jday += 366
elif y % 100 == 60:
y += 1
jday += 365
elif y % 4 == 0:
y += 1
jday += 366
else:
y += 1
jday += 365
if year % 400 == 260:
m = months.JAPANESE_LEAP
elif year % 100 == 60:
m = months.JAPANESE_NORMAL
elif year % 4 == 0:
m = months.JAPANESE_LEAP
else:
m = months.JAPANESE_NORMAL
else:
# negative years
y = 0
cycles = (y - year) // 400
y -= (400 * cycles)
jday -= (cycles * cycle400)
while y > year:
if y - year > 400:
y -= 400
jday -= cycle400
else:
y -= 1
if abs(y) % 400 == 141:
jday -= 366
elif abs(y) % 100 == 41:
jday -= 365
elif abs(y) % 4 == 1:
jday -= 366
else:
jday -= 365
if abs(year) % 400 == 141:
m = months.JAPANESE_LEAP
elif abs(year) % 100 == 41:
m = months.JAPANESE_NORMAL
elif abs(year) % 4 == 1:
m = months.JAPANESE_LEAP
else:
m = months.JAPANESE_NORMAL
for i in m.keys():
if i == month:
jday += day - 1
break
else:
jday += m[i]
return jday
def fromjd(jday):
"""Convert a Julian Day to a date in the Gregorian calendar"""
jday = int(jday)
year = 0
month = ""
ganjitsu = epoch
curryear = False
if jday >= epoch:
# positive date
year = 1
cycles = (jday - ganjitsu) // cycle400
year += (400 * cycles)
ganjitsu += (cycles * cycle400)
while curryear == False:
if jday - ganjitsu > cycle400:
year += 400
ganjitsu += cycle400
else:
#year += 1
if year % 400 == 260:
if jday - ganjitsu < 366:
curryear = True
else:
ganjitsu += 366
year += 1
elif year % 100 == 60:
if jday - ganjitsu < 365:
curryear = True
else:
ganjitsu += 365
year += 1
elif year % 4 == 0:
if jday - ganjitsu < 366:
curryear = True
else:
ganjitsu += 366
year += 1
else:
if jday - ganjitsu < 365:
curryear = True
else:
ganjitsu += 365
year +=1
if year % 400 == 260:
# leap year
m = months.JAPANESE_LEAP
elif year % 100 == 60:
# not a leap year
m = months.JAPANESE_NORMAL
elif year % 4 == 0:
# leap year
m = months.JAPANESE_LEAP
else:
# not a leap year
m = months.JAPANESE_NORMAL
else:
# negative date
cycles = (ganjitsu - jday) // cycle400
year -= (400 * cycles)
ganjitsu -= (cycles * cycle400)
while ganjitsu > jday:
year -= 1
if abs(year) % 400 == 141:
ganjitsu -= 366
elif abs(year) % 100 == 41:
ganjitsu -= 365
elif abs(year) % 4 == 1:
ganjitsu -= 366
else:
ganjitsu -= 365
if abs(year) % 400 == 141:
# leap year
m = months.JAPANESE_LEAP
elif abs(year) % 100 == 41:
# not a leap year
m = months.JAPANESE_NORMAL
elif abs(year) % 4 == 1:
# leap year
m = months.JAPANESE_LEAP
else:
# not leap year
m = months.JAPANESE_NORMAL
delta = jday - ganjitsu
for i in m.keys():
if delta < m[i]:
month = i
day = delta + 1
break
else:
delta -= m[i]
return (day, month, year)