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- # These classes override date and datetime to ensure that strftime('%Y')
- # returns four digits (with leading zeros) on years < 1000.
- # https://bugs.python.org/issue13305
- #
- # Based on code submitted to comp.lang.python by Andrew Dalke
- #
- # >>> datetime_safe.date(10, 8, 2).strftime("%Y/%m/%d was a %A")
- # '0010/08/02 was a Monday'
-
- import time
- import warnings
- from datetime import date as real_date
- from datetime import datetime as real_datetime
-
- from django.utils.deprecation import RemovedInDjango50Warning
- from django.utils.regex_helper import _lazy_re_compile
-
- warnings.warn(
- "The django.utils.datetime_safe module is deprecated.",
- category=RemovedInDjango50Warning,
- stacklevel=2,
- )
-
-
- class date(real_date):
- def strftime(self, fmt):
- return strftime(self, fmt)
-
-
- class datetime(real_datetime):
- def strftime(self, fmt):
- return strftime(self, fmt)
-
- @classmethod
- def combine(cls, date, time):
- return cls(
- date.year,
- date.month,
- date.day,
- time.hour,
- time.minute,
- time.second,
- time.microsecond,
- time.tzinfo,
- )
-
- def date(self):
- return date(self.year, self.month, self.day)
-
-
- def new_date(d):
- "Generate a safe date from a datetime.date object."
- return date(d.year, d.month, d.day)
-
-
- def new_datetime(d):
- """
- Generate a safe datetime from a datetime.date or datetime.datetime object.
- """
- kw = [d.year, d.month, d.day]
- if isinstance(d, real_datetime):
- kw.extend([d.hour, d.minute, d.second, d.microsecond, d.tzinfo])
- return datetime(*kw)
-
-
- # This library does not support strftime's "%s" or "%y" format strings.
- # Allowed if there's an even number of "%"s because they are escaped.
- _illegal_formatting = _lazy_re_compile(r"((^|[^%])(%%)*%[sy])")
-
-
- def _findall(text, substr):
- # Also finds overlaps
- sites = []
- i = 0
- while True:
- i = text.find(substr, i)
- if i == -1:
- break
- sites.append(i)
- i += 1
- return sites
-
-
- def strftime(dt, fmt):
- if dt.year >= 1000:
- return super(type(dt), dt).strftime(fmt)
- illegal_formatting = _illegal_formatting.search(fmt)
- if illegal_formatting:
- raise TypeError(
- "strftime of dates before 1000 does not handle " + illegal_formatting[0]
- )
-
- year = dt.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 = dt.timetuple()
- s1 = time.strftime(fmt, (year,) + timetuple[1:])
- sites1 = _findall(s1, str(year))
-
- s2 = time.strftime(fmt, (year + 28,) + timetuple[1:])
- sites2 = _findall(s2, str(year + 28))
-
- sites = []
- for site in sites1:
- if site in sites2:
- sites.append(site)
-
- s = s1
- syear = "%04d" % dt.year
- for site in sites:
- s = s[:site] + syear + s[site + 4 :]
- return s
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