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7068: back-port from trunk

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svn: r23280
This commit is contained in:
Vassilii Khachaturov 2013-10-08 13:02:17 +00:00
parent 874be122fb
commit e6e7da14b0
1 changed files with 16 additions and 17 deletions
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19
src/gen/lib/calendar.py
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@ -463,29 +463,28 @@ def gregorian_ymd(sdn):
year = year - 1
return (year, month, day)
def french_sdn(year, month, day):
def _check_republican_period(sdn, restrict_period):
# French Republican calendar wasn't in use before 22.9.1792 or after 1.1.1806
if restrict_period and (sdn < 2375840 or sdn > 2380688):
raise ValueError("Outside of the French Republican period")
def french_sdn(year, month, day, restrict_period=False):
"""Convert a French Republican Calendar date to an SDN number."""
sdn = (year*_FR_DAYS_PER_4_YEARS) // 4 + \
(month-1)*_FR_DAYS_PER_MONTH + \
day + _FR_SDN_OFFSET
# do not convert dates before 22.9.1792 or after 1.1.1806
if sdn < 2375840 or sdn > 2380688 :
return gregorian_sdn(year, month, day)
else:
_check_republican_period(sdn, restrict_period)
return sdn
def french_ymd(sdn):
def french_ymd(sdn, restrict_period=False):
"""Convert an SDN number to a French Republican Calendar date."""
# only between 22.9.1792 and 1.1.1806
if sdn >= 2375840 and sdn <= 2380688:
_check_republican_period(sdn, restrict_period)
temp = (sdn-_FR_SDN_OFFSET)*4 - 1
year = temp // _FR_DAYS_PER_4_YEARS
day_of_year = (temp % _FR_DAYS_PER_4_YEARS) // 4
month = (day_of_year // _FR_DAYS_PER_MONTH) + 1
day = (day_of_year % _FR_DAYS_PER_MONTH) + 1
return (year, month, day)
else:
return gregorian_ymd(sdn)
def persian_sdn(year, month, day):
"""Convert a Persian date to an SDN number."""