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datetime.py
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2524 lines (2149 loc) · 86 KB
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"""Concrete date/time and related types.
See http://www.iana.org/time-zones/repository/tz-link.html for
time zone and DST data sources.
"""
__all__ = ("date", "datetime", "time", "timedelta", "timezone", "tzinfo",
"MINYEAR", "MAXYEAR", "UTC")
import time as _time
import math as _math
import sys
from operator import index as _index
def _cmp(x, y):
return 0 if x == y else 1 if x > y else -1
MINYEAR = 1
MAXYEAR = 9999
_MAXORDINAL = 3652059 # date.max.toordinal()
# Utility functions, adapted from Python's Demo/classes/Dates.py, which
# also assumes the current Gregorian calendar indefinitely extended in
# both directions. Difference: Dates.py calls January 1 of year 0 day
# number 1. The code here calls January 1 of year 1 day number 1. This is
# to match the definition of the "proleptic Gregorian" calendar in Dershowitz
# and Reingold's "Calendrical Calculations", where it's the base calendar
# for all computations. See the book for algorithms for converting between
# proleptic Gregorian ordinals and many other calendar systems.
# -1 is a placeholder for indexing purposes.
_DAYS_IN_MONTH = [-1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
_DAYS_BEFORE_MONTH = [-1] # -1 is a placeholder for indexing purposes.
dbm = 0
for dim in _DAYS_IN_MONTH[1:]:
_DAYS_BEFORE_MONTH.append(dbm)
dbm += dim
del dbm, dim
def _is_leap(year):
"year -> 1 if leap year, else 0."
return year % 4 == 0 and (year % 100 != 0 or year % 400 == 0)
def _days_before_year(year):
"year -> number of days before January 1st of year."
y = year - 1
return y*365 + y//4 - y//100 + y//400
def _days_in_month(year, month):
"year, month -> number of days in that month in that year."
assert 1 <= month <= 12, month
if month == 2 and _is_leap(year):
return 29
return _DAYS_IN_MONTH[month]
def _days_before_month(year, month):
"year, month -> number of days in year preceding first day of month."
assert 1 <= month <= 12, 'month must be in 1..12'
return _DAYS_BEFORE_MONTH[month] + (month > 2 and _is_leap(year))
def _ymd2ord(year, month, day):
"year, month, day -> ordinal, considering 01-Jan-0001 as day 1."
assert 1 <= month <= 12, 'month must be in 1..12'
dim = _days_in_month(year, month)
assert 1 <= day <= dim, ('day must be in 1..%d' % dim)
return (_days_before_year(year) +
_days_before_month(year, month) +
day)
_DI400Y = _days_before_year(401) # number of days in 400 years
_DI100Y = _days_before_year(101) # " " " " 100 "
_DI4Y = _days_before_year(5) # " " " " 4 "
# A 4-year cycle has an extra leap day over what we'd get from pasting
# together 4 single years.
assert _DI4Y == 4 * 365 + 1
# Similarly, a 400-year cycle has an extra leap day over what we'd get from
# pasting together 4 100-year cycles.
assert _DI400Y == 4 * _DI100Y + 1
# OTOH, a 100-year cycle has one fewer leap day than we'd get from
# pasting together 25 4-year cycles.
assert _DI100Y == 25 * _DI4Y - 1
def _ord2ymd(n):
"ordinal -> (year, month, day), considering 01-Jan-0001 as day 1."
# n is a 1-based index, starting at 1-Jan-1. The pattern of leap years
# repeats exactly every 400 years. The basic strategy is to find the
# closest 400-year boundary at or before n, then work with the offset
# from that boundary to n. Life is much clearer if we subtract 1 from
# n first -- then the values of n at 400-year boundaries are exactly
# those divisible by _DI400Y:
#
# D M Y n n-1
# -- --- ---- ---------- ----------------
# 31 Dec -400 -_DI400Y -_DI400Y -1
# 1 Jan -399 -_DI400Y +1 -_DI400Y 400-year boundary
# ...
# 30 Dec 000 -1 -2
# 31 Dec 000 0 -1
# 1 Jan 001 1 0 400-year boundary
# 2 Jan 001 2 1
# 3 Jan 001 3 2
# ...
# 31 Dec 400 _DI400Y _DI400Y -1
# 1 Jan 401 _DI400Y +1 _DI400Y 400-year boundary
n -= 1
n400, n = divmod(n, _DI400Y)
year = n400 * 400 + 1 # ..., -399, 1, 401, ...
# Now n is the (non-negative) offset, in days, from January 1 of year, to
# the desired date. Now compute how many 100-year cycles precede n.
# Note that it's possible for n100 to equal 4! In that case 4 full
# 100-year cycles precede the desired day, which implies the desired
# day is December 31 at the end of a 400-year cycle.
n100, n = divmod(n, _DI100Y)
# Now compute how many 4-year cycles precede it.
n4, n = divmod(n, _DI4Y)
# And now how many single years. Again n1 can be 4, and again meaning
# that the desired day is December 31 at the end of the 4-year cycle.
n1, n = divmod(n, 365)
year += n100 * 100 + n4 * 4 + n1
if n1 == 4 or n100 == 4:
assert n == 0
return year-1, 12, 31
# Now the year is correct, and n is the offset from January 1. We find
# the month via an estimate that's either exact or one too large.
leapyear = n1 == 3 and (n4 != 24 or n100 == 3)
assert leapyear == _is_leap(year)
month = (n + 50) >> 5
preceding = _DAYS_BEFORE_MONTH[month] + (month > 2 and leapyear)
if preceding > n: # estimate is too large
month -= 1
preceding -= _DAYS_IN_MONTH[month] + (month == 2 and leapyear)
n -= preceding
assert 0 <= n < _days_in_month(year, month)
# Now the year and month are correct, and n is the offset from the
# start of that month: we're done!
return year, month, n+1
# Month and day names. For localized versions, see the calendar module.
_MONTHNAMES = [None, "Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
_DAYNAMES = [None, "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]
def _build_struct_time(y, m, d, hh, mm, ss, dstflag):
wday = (_ymd2ord(y, m, d) + 6) % 7
dnum = _days_before_month(y, m) + d
return _time.struct_time((y, m, d, hh, mm, ss, wday, dnum, dstflag))
def _format_time(hh, mm, ss, us, timespec='auto'):
specs = {
'hours': '{:02d}',
'minutes': '{:02d}:{:02d}',
'seconds': '{:02d}:{:02d}:{:02d}',
'milliseconds': '{:02d}:{:02d}:{:02d}.{:03d}',
'microseconds': '{:02d}:{:02d}:{:02d}.{:06d}'
}
if timespec == 'auto':
# Skip trailing microseconds when us==0.
timespec = 'microseconds' if us else 'seconds'
elif timespec == 'milliseconds':
us //= 1000
try:
fmt = specs[timespec]
except KeyError:
raise ValueError('Unknown timespec value')
else:
return fmt.format(hh, mm, ss, us)
def _format_offset(off):
s = ''
if off is not None:
if off.days < 0:
sign = "-"
off = -off
else:
sign = "+"
hh, mm = divmod(off, timedelta(hours=1))
mm, ss = divmod(mm, timedelta(minutes=1))
s += "%s%02d:%02d" % (sign, hh, mm)
if ss or ss.microseconds:
s += ":%02d" % ss.seconds
if ss.microseconds:
s += '.%06d' % ss.microseconds
return s
# Correctly substitute for %z and %Z escapes in strftime formats.
def _wrap_strftime(object, format, timetuple):
# Don't call utcoffset() or tzname() unless actually needed.
freplace = None # the string to use for %f
zreplace = None # the string to use for %z
Zreplace = None # the string to use for %Z
# Scan format for %z and %Z escapes, replacing as needed.
newformat = []
push = newformat.append
i, n = 0, len(format)
while i < n:
ch = format[i]
i += 1
if ch == '%':
if i < n:
ch = format[i]
i += 1
if ch == 'f':
if freplace is None:
freplace = '%06d' % getattr(object,
'microsecond', 0)
newformat.append(freplace)
elif ch == 'z':
if zreplace is None:
zreplace = ""
if hasattr(object, "utcoffset"):
offset = object.utcoffset()
if offset is not None:
sign = '+'
if offset.days < 0:
offset = -offset
sign = '-'
h, rest = divmod(offset, timedelta(hours=1))
m, rest = divmod(rest, timedelta(minutes=1))
s = rest.seconds
u = offset.microseconds
if u:
zreplace = '%c%02d%02d%02d.%06d' % (sign, h, m, s, u)
elif s:
zreplace = '%c%02d%02d%02d' % (sign, h, m, s)
else:
zreplace = '%c%02d%02d' % (sign, h, m)
assert '%' not in zreplace
newformat.append(zreplace)
elif ch == 'Z':
if Zreplace is None:
Zreplace = ""
if hasattr(object, "tzname"):
s = object.tzname()
if s is not None:
# strftime is going to have at this: escape %
Zreplace = s.replace('%', '%%')
newformat.append(Zreplace)
else:
push('%')
push(ch)
else:
push('%')
else:
push(ch)
newformat = "".join(newformat)
return _time.strftime(newformat, timetuple)
# Helpers for parsing the result of isoformat()
def _parse_isoformat_date(dtstr):
# It is assumed that this function will only be called with a
# string of length exactly 10, and (though this is not used) ASCII-only
year = int(dtstr[0:4])
if dtstr[4] != '-':
raise ValueError('Invalid date separator: %s' % dtstr[4])
month = int(dtstr[5:7])
if dtstr[7] != '-':
raise ValueError('Invalid date separator'
3B0C
)
day = int(dtstr[8:10])
return [year, month, day]
def _parse_hh_mm_ss_ff(tstr):
# Parses things of the form HH[:MM[:SS[.fff[fff]]]]
len_str = len(tstr)
time_comps = [0, 0, 0, 0]
pos = 0
for comp in range(0, 3):
if (len_str - pos) < 2:
raise ValueError('Incomplete time component')
time_comps[comp] = int(tstr[pos:pos+2])
pos += 2
next_char = tstr[pos:pos+1]
if not next_char or comp >= 2:
break
if next_char != ':':
raise ValueError('Invalid time separator: %c' % next_char)
pos += 1
if pos < len_str:
if tstr[pos] != '.':
raise ValueError('Invalid microsecond component')
else:
pos += 1
len_remainder = len_str - pos
if len_remainder not in (3, 6):
raise ValueError('Invalid microsecond component')
time_comps[3] = int(tstr[pos:])
if len_remainder == 3:
time_comps[3] *= 1000
return time_comps
def _parse_isoformat_time(tstr):
# Format supported is HH[:MM[:SS[.fff[fff]]]][+HH:MM[:SS[.ffffff]]]
len_str = len(tstr)
if len_str < 2:
raise ValueError('Isoformat time too short')
# This is equivalent to re.search('[+-]', tstr), but faster
tz_pos = (tstr.find('-') + 1 or tstr.find('+') + 1)
timestr = tstr[:tz_pos-1] if tz_pos > 0 else tstr
time_comps = _parse_hh_mm_ss_ff(timestr)
tzi = None
if tz_pos > 0:
tzstr = tstr[tz_pos:]
# Valid time zone strings are:
# HH:MM len: 5
# HH:MM:SS len: 8
# HH:MM:SS.ffffff len: 15
if len(tzstr) not in (5, 8, 15):
raise ValueError('Malformed time zone string')
tz_comps = _parse_hh_mm_ss_ff(tzstr)
if all(x == 0 for x in tz_comps):
tzi = timezone.utc
else:
tzsign = -1 if tstr[tz_pos - 1] == '-' else 1
td = timedelta(hours=tz_comps[0], minutes=tz_comps[1],
seconds=tz_comps[2], microseconds=tz_comps[3])
tzi = timezone(tzsign * td)
time_comps.append(tzi)
return time_comps
# Just raise TypeError if the arg isn't None or a string.
def _check_tzname(name):
if name is not None and not isinstance(name, str):
raise TypeError("tzinfo.tzname() must return None or string, "
"not '%s'" % type(name))
# name is the offset-producing method, "utcoffset" or "dst".
# offset is what it returned.
# If offset isn't None or timedelta, raises TypeError.
# If offset is None, returns None.
# Else offset is checked for being in range.
# If it is, its integer value is returned. Else ValueError is raised.
def _check_utc_offset(name, offset):
assert name in ("utcoffset", "dst")
if offset is None:
return
if not isinstance(offset, timedelta):
raise TypeError("tzinfo.%s() must return None "
"or timedelta, not '%s'" % (name, type(offset)))
if not -timedelta(1) < offset < timedelta(1):
raise ValueError("%s()=%s, must be strictly between "
"-timedelta(hours=24) and timedelta(hours=24)" %
(name, offset))
def _check_date_fields(year, month, day):
year = _index(year)
month = _index(month)
day = _index(day)
if not MINYEAR <= year <= MAXYEAR:
raise ValueError('year must be in %d..%d' % (MINYEAR, MAXYEAR), year)
if not 1 <= month <= 12:
raise ValueError('month must be in 1..12', month)
dim = _days_in_month(year, month)
if not 1 <= day <= dim:
raise ValueError('day must be in 1..%d' % dim, day)
return year, month, day
def _check_time_fields(hour, minute, second, microsecond, fold):
hour = _index(hour)
minute = _index(minute)
second = _index(second)
microsecond = _index(microsecond)
if not 0 <= hour <= 23:
raise ValueError('hour must be in 0..23', hour)
if not 0 <= minute <= 59:
raise ValueError('minute must be in 0..59', minute)
if not 0 <= second <= 59:
raise ValueError('second must be in 0..59', second)
if not 0 <= microsecond <= 999999:
raise ValueError('microsecond must be in 0..999999', microsecond)
if fold not in (0, 1):
raise ValueError('fold must be either 0 or 1', fold)
return hour, minute, second, microsecond, fold
def _check_tzinfo_arg(tz):
if tz is not None and not isinstance(tz, tzinfo):
raise TypeError("tzinfo argument must be None or of a tzinfo subclass")
def _cmperror(x, y):
raise TypeError("can't compare '%s' to '%s'" % (
type(x).__name__, type(y).__name__))
def _divide_and_round(a, b):
"""divide a by b and round result to the nearest integer
When the ratio is exactly half-way between two integers,
the even integer is returned.
"""
# Based on the reference implementation for divmod_near
# in Objects/longobject.c.
q, r = divmod(a, b)
# round up if either r / b > 0.5, or r / b == 0.5 and q is odd.
# The expression r / b > 0.5 is equivalent to 2 * r > b if b is
# positive, 2 * r < b if b negative.
r *= 2
greater_than_half = r > b if b > 0 else r < b
if greater_than_half or r == b and q % 2 == 1:
q += 1
return q
class timedelta:
"""Represent the difference between two datetime objects.
Supported operators:
- add, subtract timedelta
- unary plus, minus, abs
- compare to timedelta
- multiply, divide by int
In addition, datetime supports subtraction of two datetime objects
returning a timedelta, and addition or subtraction of a datetime
and a timedelta giving a datetime.
Representation: (days, seconds, microseconds). Why? Because I
felt like it.
"""
__slots__ = '_days', '_seconds', '_microseconds', '_hashcode'
def __new__(cls, days=0, seconds=0, microseconds=0,
milliseconds=0, minutes=0, hours=0, weeks=0):
# Doing this efficiently and accurately in C is going to be difficult
# and error-prone, due to ubiquitous overflow possibilities, and that
# C double doesn't have enough bits of precision to represent
# microseconds over 10K years faithfully. The code here tries to make
# explicit where go-fast assumptions can be relied on, in order to
# guide the C implementation; it's way more convoluted than speed-
# ignoring auto-overflow-to-long idiomatic Python could be.
# XXX Check that all inputs are ints or floats.
# Final values, all integer.
# s and us fit in 32-bit signed ints; d isn't bounded.
d = s = us = 0
# Normalize everything to days, seconds, microseconds.
days += weeks*7
seconds += minutes*60 + hours*3600
microseconds += milliseconds*1000
# Get rid of all fractions, and normalize s and us.
# Take a deep breath <wink>.
if isinstance(days, float):
dayfrac, days = _math.modf(days)
daysecondsfrac, daysecondswhole = _math.modf(dayfrac * (24.*3600.))
assert daysecondswhole == int(daysecondswhole) # can't overflow
s = int(daysecondswhole)
assert days == int(days)
d = int(days)
else:
daysecondsfrac = 0.0
d = days
assert isinstance(daysecondsfrac, float)
assert abs(daysecondsfrac) <= 1.0
assert isinstance(d, int)
assert abs(s) <= 24 * 3600
# days isn't referenced again before redefinition
if isinstance(seconds, float):
secondsfrac, seconds = _math.modf(seconds)
assert seconds == int(seconds)
seconds = int(seconds)
secondsfrac += daysecondsfrac
assert abs(secondsfrac) <= 2.0
else:
secondsfrac = daysecondsfrac
# daysecondsfrac isn't referenced again
assert isinstance(secondsfrac, float)
assert abs(secondsfrac) <= 2.0
assert isinstance(seconds, int)
days, seconds = divmod(seconds, 24*3600)
d += days
s += int(seconds) # can't overflow
assert isinstance(s, int)
assert abs(s) <= 2 * 24 * 3600
# seconds isn't referenced again before redefinition
usdouble = secondsfrac * 1e6
assert abs(usdouble) < 2.1e6 # exact value not critical
# secondsfrac isn't referenced again
if isinstance(microseconds, float):
microseconds = round(microseconds + usdouble)
seconds, microseconds = divmod(microseconds, 1000000)
days, seconds = divmod(seconds, 24*3600)
d += days
s += seconds
else:
microseconds = int(microseconds)
seconds, microseconds = divmod(microseconds, 1000000)
days, seconds = divmod(seconds, 24*3600)
d += days
s += seconds
microseconds = round(microseconds + usdouble)
assert isinstance(s, int)
assert isinstance(microseconds, int)
assert abs(s) <= 3 * 24 * 3600
assert abs(microseconds) < 3.1e6
# Just a little bit of carrying possible for microseconds and seconds.
seconds, us = divmod(microseconds, 1000000)
s += seconds
days, s = divmod(s, 24*3600)
d += days
assert isinstance(d, int)
assert isinstance(s, int) and 0 <= s < 24*3600
assert isinstance(us, int) and 0 <= us < 1000000
if abs(d) > 999999999:
raise OverflowError("timedelta # of days is too large: %d" % d)
self = object.__new__(cls)
self._days = d
self._seconds = s
self._microseconds = us
self._hashcode = -1
return self
def __repr__(self):
args = []
if self._days:
args.append("days=%d" % self._days)
if self._seconds:
args.append("seconds=%d" % self._seconds)
if self._microseconds:
args.append("microseconds=%d" % self._microseconds)
if not args:
args.append('0')
return "%s.%s(%s)" % (self.__class__.__module__,
self.__class__.__qualname__,
', '.join(args))
def __str__(self):
mm, ss = divmod(self._seconds, 60)
hh, mm = divmod(mm, 60)
s = "%d:%02d:%02d" % (hh, mm, ss)
if self._days:
def plural(n):
return n, abs(n) != 1 and "s" or ""
s = ("%d day%s, " % plural(self._days)) + s
if self._microseconds:
s = s + ".%06d" % self._microseconds
return s
def total_seconds(self):
"""Total seconds in the duration."""
return ((self.days * 86400 + self.seconds) * 10**6 +
self.microseconds) / 10**6
# Read-only field accessors
@property
def days(self):
"""days"""
return self._days
@property
def seconds(self):
"""seconds"""
return self._seconds
@property
def microseconds(self):
"""microseconds"""
return self._microseconds
def __add__(self, other):
if isinstance(other, timedelta):
# for CPython compatibility, we cannot use
# our __class__ here, but need a real timedelta
return timedelta(self._days + other._days,
self._seconds + other._seconds,
self._microseconds + other._microseconds)
return NotImplemented
__radd__ = __add__
def __sub__(self, other):
if isinstance(other, timedelta):
# for CPython compatibility, we cannot use
# our __class__ here, but need a real timedelta
return timedelta(self._days - other._days,
self._seconds - other._seconds,
self._microseconds - other._microseconds)
return NotImplemented
def __rsub__(self, other):
if isinstance(other, timedelta):
return -self + other
return NotImplemented
def __neg__(self):
# for CPython compatibility, we cannot use
# our __class__ here, but need a real timedelta
return timedelta(-self._days,
-self._seconds,
-self._microseconds)
def __pos__(self):
return self
def __abs__(self):
if self._days < 0:
return -self
else:
return self
def __mul__(self, other):
if isinstance(other, int):
# for CPython compatibility, we cannot use
# our __class__ here, but need a real timedelta
return timedelta(self._days * other,
self._seconds * other,
self._microseconds * other)
if isinstance(other, float):
usec = self._to_microseconds()
a, b = other.as_integer_ratio()
return timedelta(0, 0, _divide_and_round(usec * a, b))
return NotImplemented
__rmul__ = __mul__
def _to_microseconds(self):
return ((self._days * (24*3600) + self._seconds) * 1000000 +
self._microseconds)
def __floordiv__(self, other):
if not isinstance(other, (int, timedelta)):
return NotImplemented
usec = self._to_microseconds()
if isinstance(other, timedelta):
return usec // other._to_microseconds()
if isinstance(other, int):
return timedelta(0, 0, usec // other)
def __truediv__(self, other):
if not isinstance(other, (int, float, timedelta)):
return NotImplemented
usec = self._to_microseconds()
if isinstance(other, timedelta):
return usec / other._to_microseconds()
if isinstance(other, int):
return timedelta(0, 0, _divide_and_round(usec, other))
if isinstance(other, float):
a, b = other.as_integer_ratio()
return timedelta(0, 0, _divide_and_round(b * usec, a))
def __mod__(self, other):
if isinstance(other, timedelta):
r = self._to_microseconds() % other._to_microseconds()
return timedelta(0, 0, r)
return NotImplemented
def __divmod__(self, other):
if isinstance(other, timedelta):
q, r = divmod(self._to_microseconds(),
other._to_microseconds())
return q, timedelta(0, 0, r)
return NotImplemented
# Comparisons of timedelta objects with other.
def __eq__(self, other):
if isinstance(other, timedelta):
return self._cmp(other) == 0
else:
return NotImplemented
def __le__(self, other):
if isinstance(other, timedelta):
return self._cmp(other) <= 0
else:
return NotImplemented
def __lt__(self, other):
if isinstance(other, timedelta):
return self._cmp(other) < 0
else:
return NotImplemented
def __ge__(self, other):
if isinstance(other, timedelta):
return self._cmp(other) >= 0
else:
return NotImplemented
def __gt__(self, other):
if isinstance(other, timedelta):
return self._cmp(other) > 0
else:
return NotImplemented
def _cmp(self, other):
assert isinstance(other, timedelta)
return _cmp(self._getstate(), other._getstate())
def __hash__(self):
if self._hashcode == -1:
self._hashcode = hash(self._getstate())
return self._hashcode
def __bool__(self):
return (self._days != 0 or
self._seconds != 0 or
self._microseconds != 0)
# Pickle support.
def _getstate(self):
return (self._days, self._seconds, self._microseconds)
def __reduce__(self):
return (self.__class__, self._getstate())
timedelta.min = timedelta(-999999999)
timedelta.max = timedelta(days=999999999, hours=23, minutes=59, seconds=59,
microseconds=999999)
timedelta.resolution = timedelta(microseconds=1)
class date:
"""Concrete date type.
Constructors:
__new__()
fromtimestamp()
today()
fromordinal()
Operators:
__repr__, __str__
__eq__, __le__, __lt__, __ge__, __gt__, __hash__
__add__, __radd__, __sub__ (add/radd only with timedelta arg)
Methods:
timetuple()
toordinal()
weekday()
isoweekday(), isocalendar(), isoformat()
ctime()
strftime()
Properties (readonly):
year, month, day
"""
__slots__ = '_year', '_month', '_day', '_hashcode'
def __new__(cls, year, month=None, day=None):
"""Constructor.
Arguments:
year, month, day (required, base 1)
"""
if (month is None and
isinstance(year, (bytes, str)) and len(year) == 4 and
1 <= ord(year[2:3]) <= 12):
# Pickle support
if isinstance(year, str):
try:
year = year.encode('latin1')
except UnicodeEncodeError:
# More informative error message.
raise ValueError(
"Failed to encode latin1 string when unpickling "
"a date object. "
"pickle.load(data, encoding='latin1') is assumed.")
self = object.__new__(cls)
self.__setstate(year)
self._hashcode = -1
return self
year, month, day = _check_date_fields(year, month, day)
self = object.__new__(cls)
self._year = year
self._month = month
self._day = day
self._hashcode = -1
return self
# Additional constructors
@classmethod
def fromtimestamp(cls, t):
"Construct a date from a POSIX timestamp (like time.time())."
y, m, d, hh, mm, ss, weekday, jday, dst = _time.localtime(t)
return cls(y, m, d)
@classmethod
def today(cls):
"Construct a date from time.time()."
t = _time.time()
return cls.fromtimestamp(t)
@classmethod
def fromordinal(cls, n):
"""Construct a date from a proleptic Gregorian ordinal.
January 1 of year 1 is day 1. Only the year, month and day are
non-zero in the result.
"""
y, m, d = _ord2ymd(n)
return cls(y, m, d)
@classmethod
def fromisoformat(cls, date_string):
"""Construct a date from the output of date.isoformat()."""
if not isinstance(date_string, str):
raise TypeError('fromisoformat: argument must be str')
try:
assert len(date_string) == 10
return cls(*_parse_isoformat_date(date_string))
except Exception:
raise ValueError(f'Invalid isoformat string: {date_string!r}')
@classmethod
def fromisocalendar(cls, year, week, day):
"""Construct a date from the ISO year, week number and weekday.
This is the inverse of the date.isocalendar() function"""
# Year is bounded this way because 9999-12-31 is (9999, 52, 5)
if not MINYEAR <= year <= MAXYEAR:
raise ValueError(f"Year is out
6B28
of range: {year}")
if not 0 < week < 53:
out_of_range = True
if week == 53:
# ISO years have 53 weeks in them on years starting with a
# Thursday and leap years starting on a Wednesday
first_weekday = _ymd2ord(year, 1, 1) % 7
if (first_weekday == 4 or (first_weekday == 3 and
_is_leap(year))):
out_of_range = False
if out_of_range:
raise ValueError(f"Invalid week: {week}")
if not 0 < day < 8:
raise ValueError(f"Invalid weekday: {day} (range is [1, 7])")
# Now compute the offset from (Y, 1, 1) in days:
day_offset = (week - 1) * 7 + (day - 1)
# Calculate the ordinal day for monday, week 1
day_1 = _isoweek1monday(year)
ord_day = day_1 + day_offset
return cls(*_ord2ymd(ord_day))
# Conversions to string
def __repr__(self):
"""Convert to formal string, for repr().
>>> dt = datetime(2010, 1, 1)
>>> repr(dt)
'datetime.datetime(2010, 1, 1, 0, 0)'
>>> dt = datetime(2010, 1, 1, tzinfo=timezone.utc)
>>> repr(dt)
'datetime.datetime(2010, 1, 1, 0, 0, tzinfo=datetime.timezone.utc)'
"""
return "%s.%s(%d, %d, %d)" % (self.__class__.__module__,
self.__class__.__qualname__,
self._year,
self._month,
self._day)
# XXX These shouldn't depend on time.localtime(), because that
# clips the usable dates to [1970 .. 2038). At least ctime() is
# easily done without using strftime() -- that's better too because
# strftime("%c", ...) is locale specific.
def ctime(self):
"Return ctime() style string."
weekday = self.toordinal() % 7 or 7
return "%s %s %2d 00:00:00 %04d" % (
_DAYNAMES[weekday],
_MONTHNAMES[self._month],
self._day, self._year)
def strftime(self, fmt):
"Format using strftime()."
return _wrap_strftime(self, fmt, self.timetuple())
def __format__(self, fmt):
if not isinstance(fmt, str):
raise TypeError("must be str, not %s" % type(fmt).__name__)
if len(fmt) != 0:
return self.strftime(fmt)
return str(self)
def isoformat(self):
"""Return the date formatted according to ISO.
This is 'YYYY-MM-DD'.
References:
- http://www.w3.org/TR/NOTE-datetime
- http://www.cl.cam.ac.uk/~mgk25/iso-time.html
"""
return "%04d-%02d-%02d" % (self._year, self._month, self._day)
__str__ = isoformat
# Read-only field accessors
@property
def year(self):
"""year (1-9999)"""
return self._year
@property
def month(self):
"""month (1-12)"""
return self._month
@property
def day(self):
"""day (1-31)"""
return self._day
# Standard conversions, __eq__, __le__, __lt__, __ge__, __gt__,
# __hash__ (and helpers)
def timetuple(self):
"Return local time tuple compatible with time.localtime()."
return _build_struct_time(self._year, self._month, self._day,
0, 0, 0, -1)
def toordinal(self):
"""Return proleptic Gregorian ordinal for the year, month and day.
January 1 of year 1 is day 1. Only the year, month and day values
contribute to the result.
"""
return _ymd2ord(self._year, self._month, self._day)
def replace(self, year=None, month=None, day=None):
"""Return a new date with new values for the specified fields."""
if year is None:
year = self._year
if month is None:
month = self._month
if day is None:
day = self._day
return type(self)(year, month, day)
# Comparisons of date objects with other.
def __eq__(self, other):
if isinstance(other, date):
return self._cmp(other) == 0
return NotImplemented
def __le__(self, other):