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#This file is part of Tryton. The COPYRIGHT file at the top level of
#this repository contains the full copyright notices and license terms.
#Copyright (c) 2002-2007 John D. Hunter; All Rights Reserved
import time
def datetime_strftime(date, fmt):
'''
Allow datetime strftime formatting for years before 1900.
See http://bugs.python.org/issue1777412
'''
if date.year > 1900:
return date.strftime(fmt)
def _findall(text, substr):
# Also finds overlaps
sites = []
i = 0
while True:
j = text.find(substr, i)
if j == -1:
break
sites.append(j)
i = j + 1
return sites
year = date.year
# For every non-leap year century, advance by
# 6 years to get into the 28-year repeat cycle
delta = 2000 - year
off = 6 * (delta // 100 + delta // 400)
year = year + off
# Move to around the year 2000
year = year + ((2000 - year) // 28) * 28
timetuple = date.timetuple()
string1 = time.strftime(fmt, (year,) + timetuple[1:])
sites1 = _findall(string1, str(year))
string2 = time.strftime(fmt, (year + 28,) + timetuple[1:])
sites2 = _findall(string2, str(year + 28))
sites = []
for site in sites1:
if site in sites2:
sites.append(site)
syear = "%4d" % (date.year,)
for site in sites:
string1 = string1[:site] + syear + string1[site + 4:]
return string1
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