You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
599 lines
24 KiB
599 lines
24 KiB
# -*- coding: utf-8 -*-
|
|
import datetime
|
|
import calendar
|
|
|
|
import operator
|
|
from math import copysign
|
|
|
|
from six import integer_types
|
|
from warnings import warn
|
|
|
|
from ._common import weekday
|
|
|
|
MO, TU, WE, TH, FR, SA, SU = weekdays = tuple(weekday(x) for x in range(7))
|
|
|
|
__all__ = ["relativedelta", "MO", "TU", "WE", "TH", "FR", "SA", "SU"]
|
|
|
|
|
|
class relativedelta(object):
|
|
"""
|
|
The relativedelta type is designed to be applied to an existing datetime and
|
|
can replace specific components of that datetime, or represents an interval
|
|
of time.
|
|
|
|
It is based on the specification of the excellent work done by M.-A. Lemburg
|
|
in his
|
|
`mx.DateTime <https://www.egenix.com/products/python/mxBase/mxDateTime/>`_ extension.
|
|
However, notice that this type does *NOT* implement the same algorithm as
|
|
his work. Do *NOT* expect it to behave like mx.DateTime's counterpart.
|
|
|
|
There are two different ways to build a relativedelta instance. The
|
|
first one is passing it two date/datetime classes::
|
|
|
|
relativedelta(datetime1, datetime2)
|
|
|
|
The second one is passing it any number of the following keyword arguments::
|
|
|
|
relativedelta(arg1=x,arg2=y,arg3=z...)
|
|
|
|
year, month, day, hour, minute, second, microsecond:
|
|
Absolute information (argument is singular); adding or subtracting a
|
|
relativedelta with absolute information does not perform an arithmetic
|
|
operation, but rather REPLACES the corresponding value in the
|
|
original datetime with the value(s) in relativedelta.
|
|
|
|
years, months, weeks, days, hours, minutes, seconds, microseconds:
|
|
Relative information, may be negative (argument is plural); adding
|
|
or subtracting a relativedelta with relative information performs
|
|
the corresponding arithmetic operation on the original datetime value
|
|
with the information in the relativedelta.
|
|
|
|
weekday:
|
|
One of the weekday instances (MO, TU, etc) available in the
|
|
relativedelta module. These instances may receive a parameter N,
|
|
specifying the Nth weekday, which could be positive or negative
|
|
(like MO(+1) or MO(-2)). Not specifying it is the same as specifying
|
|
+1. You can also use an integer, where 0=MO. This argument is always
|
|
relative e.g. if the calculated date is already Monday, using MO(1)
|
|
or MO(-1) won't change the day. To effectively make it absolute, use
|
|
it in combination with the day argument (e.g. day=1, MO(1) for first
|
|
Monday of the month).
|
|
|
|
leapdays:
|
|
Will add given days to the date found, if year is a leap
|
|
year, and the date found is post 28 of february.
|
|
|
|
yearday, nlyearday:
|
|
Set the yearday or the non-leap year day (jump leap days).
|
|
These are converted to day/month/leapdays information.
|
|
|
|
There are relative and absolute forms of the keyword
|
|
arguments. The plural is relative, and the singular is
|
|
absolute. For each argument in the order below, the absolute form
|
|
is applied first (by setting each attribute to that value) and
|
|
then the relative form (by adding the value to the attribute).
|
|
|
|
The order of attributes considered when this relativedelta is
|
|
added to a datetime is:
|
|
|
|
1. Year
|
|
2. Month
|
|
3. Day
|
|
4. Hours
|
|
5. Minutes
|
|
6. Seconds
|
|
7. Microseconds
|
|
|
|
Finally, weekday is applied, using the rule described above.
|
|
|
|
For example
|
|
|
|
>>> from datetime import datetime
|
|
>>> from dateutil.relativedelta import relativedelta, MO
|
|
>>> dt = datetime(2018, 4, 9, 13, 37, 0)
|
|
>>> delta = relativedelta(hours=25, day=1, weekday=MO(1))
|
|
>>> dt + delta
|
|
datetime.datetime(2018, 4, 2, 14, 37)
|
|
|
|
First, the day is set to 1 (the first of the month), then 25 hours
|
|
are added, to get to the 2nd day and 14th hour, finally the
|
|
weekday is applied, but since the 2nd is already a Monday there is
|
|
no effect.
|
|
|
|
"""
|
|
|
|
def __init__(self, dt1=None, dt2=None,
|
|
years=0, months=0, days=0, leapdays=0, weeks=0,
|
|
hours=0, minutes=0, seconds=0, microseconds=0,
|
|
year=None, month=None, day=None, weekday=None,
|
|
yearday=None, nlyearday=None,
|
|
hour=None, minute=None, second=None, microsecond=None):
|
|
|
|
if dt1 and dt2:
|
|
# datetime is a subclass of date. So both must be date
|
|
if not (isinstance(dt1, datetime.date) and
|
|
isinstance(dt2, datetime.date)):
|
|
raise TypeError("relativedelta only diffs datetime/date")
|
|
|
|
# We allow two dates, or two datetimes, so we coerce them to be
|
|
# of the same type
|
|
if (isinstance(dt1, datetime.datetime) !=
|
|
isinstance(dt2, datetime.datetime)):
|
|
if not isinstance(dt1, datetime.datetime):
|
|
dt1 = datetime.datetime.fromordinal(dt1.toordinal())
|
|
elif not isinstance(dt2, datetime.datetime):
|
|
dt2 = datetime.datetime.fromordinal(dt2.toordinal())
|
|
|
|
self.years = 0
|
|
self.months = 0
|
|
self.days = 0
|
|
self.leapdays = 0
|
|
self.hours = 0
|
|
self.minutes = 0
|
|
self.seconds = 0
|
|
self.microseconds = 0
|
|
self.year = None
|
|
self.month = None
|
|
self.day = None
|
|
self.weekday = None
|
|
self.hour = None
|
|
self.minute = None
|
|
self.second = None
|
|
self.microsecond = None
|
|
self._has_time = 0
|
|
|
|
# Get year / month delta between the two
|
|
months = (dt1.year - dt2.year) * 12 + (dt1.month - dt2.month)
|
|
self._set_months(months)
|
|
|
|
# Remove the year/month delta so the timedelta is just well-defined
|
|
# time units (seconds, days and microseconds)
|
|
dtm = self.__radd__(dt2)
|
|
|
|
# If we've overshot our target, make an adjustment
|
|
if dt1 < dt2:
|
|
compare = operator.gt
|
|
increment = 1
|
|
else:
|
|
compare = operator.lt
|
|
increment = -1
|
|
|
|
while compare(dt1, dtm):
|
|
months += increment
|
|
self._set_months(months)
|
|
dtm = self.__radd__(dt2)
|
|
|
|
# Get the timedelta between the "months-adjusted" date and dt1
|
|
delta = dt1 - dtm
|
|
self.seconds = delta.seconds + delta.days * 86400
|
|
self.microseconds = delta.microseconds
|
|
else:
|
|
# Check for non-integer values in integer-only quantities
|
|
if any(x is not None and x != int(x) for x in (years, months)):
|
|
raise ValueError("Non-integer years and months are "
|
|
"ambiguous and not currently supported.")
|
|
|
|
# Relative information
|
|
self.years = int(years)
|
|
self.months = int(months)
|
|
self.days = days + weeks * 7
|
|
self.leapdays = leapdays
|
|
self.hours = hours
|
|
self.minutes = minutes
|
|
self.seconds = seconds
|
|
self.microseconds = microseconds
|
|
|
|
# Absolute information
|
|
self.year = year
|
|
self.month = month
|
|
self.day = day
|
|
self.hour = hour
|
|
self.minute = minute
|
|
self.second = second
|
|
self.microsecond = microsecond
|
|
|
|
if any(x is not None and int(x) != x
|
|
for x in (year, month, day, hour,
|
|
minute, second, microsecond)):
|
|
# For now we'll deprecate floats - later it'll be an error.
|
|
warn("Non-integer value passed as absolute information. " +
|
|
"This is not a well-defined condition and will raise " +
|
|
"errors in future versions.", DeprecationWarning)
|
|
|
|
if isinstance(weekday, integer_types):
|
|
self.weekday = weekdays[weekday]
|
|
else:
|
|
self.weekday = weekday
|
|
|
|
yday = 0
|
|
if nlyearday:
|
|
yday = nlyearday
|
|
elif yearday:
|
|
yday = yearday
|
|
if yearday > 59:
|
|
self.leapdays = -1
|
|
if yday:
|
|
ydayidx = [31, 59, 90, 120, 151, 181, 212,
|
|
243, 273, 304, 334, 366]
|
|
for idx, ydays in enumerate(ydayidx):
|
|
if yday <= ydays:
|
|
self.month = idx+1
|
|
if idx == 0:
|
|
self.day = yday
|
|
else:
|
|
self.day = yday-ydayidx[idx-1]
|
|
break
|
|
else:
|
|
raise ValueError("invalid year day (%d)" % yday)
|
|
|
|
self._fix()
|
|
|
|
def _fix(self):
|
|
if abs(self.microseconds) > 999999:
|
|
s = _sign(self.microseconds)
|
|
div, mod = divmod(self.microseconds * s, 1000000)
|
|
self.microseconds = mod * s
|
|
self.seconds += div * s
|
|
if abs(self.seconds) > 59:
|
|
s = _sign(self.seconds)
|
|
div, mod = divmod(self.seconds * s, 60)
|
|
self.seconds = mod * s
|
|
self.minutes += div * s
|
|
if abs(self.minutes) > 59:
|
|
s = _sign(self.minutes)
|
|
div, mod = divmod(self.minutes * s, 60)
|
|
self.minutes = mod * s
|
|
self.hours += div * s
|
|
if abs(self.hours) > 23:
|
|
s = _sign(self.hours)
|
|
div, mod = divmod(self.hours * s, 24)
|
|
self.hours = mod * s
|
|
self.days += div * s
|
|
if abs(self.months) > 11:
|
|
s = _sign(self.months)
|
|
div, mod = divmod(self.months * s, 12)
|
|
self.months = mod * s
|
|
self.years += div * s
|
|
if (self.hours or self.minutes or self.seconds or self.microseconds
|
|
or self.hour is not None or self.minute is not None or
|
|
self.second is not None or self.microsecond is not None):
|
|
self._has_time = 1
|
|
else:
|
|
self._has_time = 0
|
|
|
|
@property
|
|
def weeks(self):
|
|
return int(self.days / 7.0)
|
|
|
|
@weeks.setter
|
|
def weeks(self, value):
|
|
self.days = self.days - (self.weeks * 7) + value * 7
|
|
|
|
def _set_months(self, months):
|
|
self.months = months
|
|
if abs(self.months) > 11:
|
|
s = _sign(self.months)
|
|
div, mod = divmod(self.months * s, 12)
|
|
self.months = mod * s
|
|
self.years = div * s
|
|
else:
|
|
self.years = 0
|
|
|
|
def normalized(self):
|
|
"""
|
|
Return a version of this object represented entirely using integer
|
|
values for the relative attributes.
|
|
|
|
>>> relativedelta(days=1.5, hours=2).normalized()
|
|
relativedelta(days=+1, hours=+14)
|
|
|
|
:return:
|
|
Returns a :class:`dateutil.relativedelta.relativedelta` object.
|
|
"""
|
|
# Cascade remainders down (rounding each to roughly nearest microsecond)
|
|
days = int(self.days)
|
|
|
|
hours_f = round(self.hours + 24 * (self.days - days), 11)
|
|
hours = int(hours_f)
|
|
|
|
minutes_f = round(self.minutes + 60 * (hours_f - hours), 10)
|
|
minutes = int(minutes_f)
|
|
|
|
seconds_f = round(self.seconds + 60 * (minutes_f - minutes), 8)
|
|
seconds = int(seconds_f)
|
|
|
|
microseconds = round(self.microseconds + 1e6 * (seconds_f - seconds))
|
|
|
|
# Constructor carries overflow back up with call to _fix()
|
|
return self.__class__(years=self.years, months=self.months,
|
|
days=days, hours=hours, minutes=minutes,
|
|
seconds=seconds, microseconds=microseconds,
|
|
leapdays=self.leapdays, year=self.year,
|
|
month=self.month, day=self.day,
|
|
weekday=self.weekday, hour=self.hour,
|
|
minute=self.minute, second=self.second,
|
|
microsecond=self.microsecond)
|
|
|
|
def __add__(self, other):
|
|
if isinstance(other, relativedelta):
|
|
return self.__class__(years=other.years + self.years,
|
|
months=other.months + self.months,
|
|
days=other.days + self.days,
|
|
hours=other.hours + self.hours,
|
|
minutes=other.minutes + self.minutes,
|
|
seconds=other.seconds + self.seconds,
|
|
microseconds=(other.microseconds +
|
|
self.microseconds),
|
|
leapdays=other.leapdays or self.leapdays,
|
|
year=(other.year if other.year is not None
|
|
else self.year),
|
|
month=(other.month if other.month is not None
|
|
else self.month),
|
|
day=(other.day if other.day is not None
|
|
else self.day),
|
|
weekday=(other.weekday if other.weekday is not None
|
|
else self.weekday),
|
|
hour=(other.hour if other.hour is not None
|
|
else self.hour),
|
|
minute=(other.minute if other.minute is not None
|
|
else self.minute),
|
|
second=(other.second if other.second is not None
|
|
else self.second),
|
|
microsecond=(other.microsecond if other.microsecond
|
|
is not None else
|
|
self.microsecond))
|
|
if isinstance(other, datetime.timedelta):
|
|
return self.__class__(years=self.years,
|
|
months=self.months,
|
|
days=self.days + other.days,
|
|
hours=self.hours,
|
|
minutes=self.minutes,
|
|
seconds=self.seconds + other.seconds,
|
|
microseconds=self.microseconds + other.microseconds,
|
|
leapdays=self.leapdays,
|
|
year=self.year,
|
|
month=self.month,
|
|
day=self.day,
|
|
weekday=self.weekday,
|
|
hour=self.hour,
|
|
minute=self.minute,
|
|
second=self.second,
|
|
microsecond=self.microsecond)
|
|
if not isinstance(other, datetime.date):
|
|
return NotImplemented
|
|
elif self._has_time and not isinstance(other, datetime.datetime):
|
|
other = datetime.datetime.fromordinal(other.toordinal())
|
|
year = (self.year or other.year)+self.years
|
|
month = self.month or other.month
|
|
if self.months:
|
|
assert 1 <= abs(self.months) <= 12
|
|
month += self.months
|
|
if month > 12:
|
|
year += 1
|
|
month -= 12
|
|
elif month < 1:
|
|
year -= 1
|
|
month += 12
|
|
day = min(calendar.monthrange(year, month)[1],
|
|
self.day or other.day)
|
|
repl = {"year": year, "month": month, "day": day}
|
|
for attr in ["hour", "minute", "second", "microsecond"]:
|
|
value = getattr(self, attr)
|
|
if value is not None:
|
|
repl[attr] = value
|
|
days = self.days
|
|
if self.leapdays and month > 2 and calendar.isleap(year):
|
|
days += self.leapdays
|
|
ret = (other.replace(**repl)
|
|
+ datetime.timedelta(days=days,
|
|
hours=self.hours,
|
|
minutes=self.minutes,
|
|
seconds=self.seconds,
|
|
microseconds=self.microseconds))
|
|
if self.weekday:
|
|
weekday, nth = self.weekday.weekday, self.weekday.n or 1
|
|
jumpdays = (abs(nth) - 1) * 7
|
|
if nth > 0:
|
|
jumpdays += (7 - ret.weekday() + weekday) % 7
|
|
else:
|
|
jumpdays += (ret.weekday() - weekday) % 7
|
|
jumpdays *= -1
|
|
ret += datetime.timedelta(days=jumpdays)
|
|
return ret
|
|
|
|
def __radd__(self, other):
|
|
return self.__add__(other)
|
|
|
|
def __rsub__(self, other):
|
|
return self.__neg__().__radd__(other)
|
|
|
|
def __sub__(self, other):
|
|
if not isinstance(other, relativedelta):
|
|
return NotImplemented # In case the other object defines __rsub__
|
|
return self.__class__(years=self.years - other.years,
|
|
months=self.months - other.months,
|
|
days=self.days - other.days,
|
|
hours=self.hours - other.hours,
|
|
minutes=self.minutes - other.minutes,
|
|
seconds=self.seconds - other.seconds,
|
|
microseconds=self.microseconds - other.microseconds,
|
|
leapdays=self.leapdays or other.leapdays,
|
|
year=(self.year if self.year is not None
|
|
else other.year),
|
|
month=(self.month if self.month is not None else
|
|
other.month),
|
|
day=(self.day if self.day is not None else
|
|
other.day),
|
|
weekday=(self.weekday if self.weekday is not None else
|
|
other.weekday),
|
|
hour=(self.hour if self.hour is not None else
|
|
other.hour),
|
|
minute=(self.minute if self.minute is not None else
|
|
other.minute),
|
|
second=(self.second if self.second is not None else
|
|
other.second),
|
|
microsecond=(self.microsecond if self.microsecond
|
|
is not None else
|
|
other.microsecond))
|
|
|
|
def __abs__(self):
|
|
return self.__class__(years=abs(self.years),
|
|
months=abs(self.months),
|
|
days=abs(self.days),
|
|
hours=abs(self.hours),
|
|
minutes=abs(self.minutes),
|
|
seconds=abs(self.seconds),
|
|
microseconds=abs(self.microseconds),
|
|
leapdays=self.leapdays,
|
|
year=self.year,
|
|
month=self.month,
|
|
day=self.day,
|
|
weekday=self.weekday,
|
|
hour=self.hour,
|
|
minute=self.minute,
|
|
second=self.second,
|
|
microsecond=self.microsecond)
|
|
|
|
def __neg__(self):
|
|
return self.__class__(years=-self.years,
|
|
months=-self.months,
|
|
days=-self.days,
|
|
hours=-self.hours,
|
|
minutes=-self.minutes,
|
|
seconds=-self.seconds,
|
|
microseconds=-self.microseconds,
|
|
leapdays=self.leapdays,
|
|
year=self.year,
|
|
month=self.month,
|
|
day=self.day,
|
|
weekday=self.weekday,
|
|
hour=self.hour,
|
|
minute=self.minute,
|
|
second=self.second,
|
|
microsecond=self.microsecond)
|
|
|
|
def __bool__(self):
|
|
return not (not self.years and
|
|
not self.months and
|
|
not self.days and
|
|
not self.hours and
|
|
not self.minutes and
|
|
not self.seconds and
|
|
not self.microseconds and
|
|
not self.leapdays and
|
|
self.year is None and
|
|
self.month is None and
|
|
self.day is None and
|
|
self.weekday is None and
|
|
self.hour is None and
|
|
self.minute is None and
|
|
self.second is None and
|
|
self.microsecond is None)
|
|
# Compatibility with Python 2.x
|
|
__nonzero__ = __bool__
|
|
|
|
def __mul__(self, other):
|
|
try:
|
|
f = float(other)
|
|
except TypeError:
|
|
return NotImplemented
|
|
|
|
return self.__class__(years=int(self.years * f),
|
|
months=int(self.months * f),
|
|
days=int(self.days * f),
|
|
hours=int(self.hours * f),
|
|
minutes=int(self.minutes * f),
|
|
seconds=int(self.seconds * f),
|
|
microseconds=int(self.microseconds * f),
|
|
leapdays=self.leapdays,
|
|
year=self.year,
|
|
month=self.month,
|
|
day=self.day,
|
|
weekday=self.weekday,
|
|
hour=self.hour,
|
|
minute=self.minute,
|
|
second=self.second,
|
|
microsecond=self.microsecond)
|
|
|
|
__rmul__ = __mul__
|
|
|
|
def __eq__(self, other):
|
|
if not isinstance(other, relativedelta):
|
|
return NotImplemented
|
|
if self.weekday or other.weekday:
|
|
if not self.weekday or not other.weekday:
|
|
return False
|
|
if self.weekday.weekday != other.weekday.weekday:
|
|
return False
|
|
n1, n2 = self.weekday.n, other.weekday.n
|
|
if n1 != n2 and not ((not n1 or n1 == 1) and (not n2 or n2 == 1)):
|
|
return False
|
|
return (self.years == other.years and
|
|
self.months == other.months and
|
|
self.days == other.days and
|
|
self.hours == other.hours and
|
|
self.minutes == other.minutes and
|
|
self.seconds == other.seconds and
|
|
self.microseconds == other.microseconds and
|
|
self.leapdays == other.leapdays and
|
|
self.year == other.year and
|
|
self.month == other.month and
|
|
self.day == other.day and
|
|
self.hour == other.hour and
|
|
self.minute == other.minute and
|
|
self.second == other.second and
|
|
self.microsecond == other.microsecond)
|
|
|
|
def __hash__(self):
|
|
return hash((
|
|
self.weekday,
|
|
self.years,
|
|
self.months,
|
|
self.days,
|
|
self.hours,
|
|
self.minutes,
|
|
self.seconds,
|
|
self.microseconds,
|
|
self.leapdays,
|
|
self.year,
|
|
self.month,
|
|
self.day,
|
|
self.hour,
|
|
self.minute,
|
|
self.second,
|
|
self.microsecond,
|
|
))
|
|
|
|
def __ne__(self, other):
|
|
return not self.__eq__(other)
|
|
|
|
def __div__(self, other):
|
|
try:
|
|
reciprocal = 1 / float(other)
|
|
except TypeError:
|
|
return NotImplemented
|
|
|
|
return self.__mul__(reciprocal)
|
|
|
|
__truediv__ = __div__
|
|
|
|
def __repr__(self):
|
|
l = []
|
|
for attr in ["years", "months", "days", "leapdays",
|
|
"hours", "minutes", "seconds", "microseconds"]:
|
|
value = getattr(self, attr)
|
|
if value:
|
|
l.append("{attr}={value:+g}".format(attr=attr, value=value))
|
|
for attr in ["year", "month", "day", "weekday",
|
|
"hour", "minute", "second", "microsecond"]:
|
|
value = getattr(self, attr)
|
|
if value is not None:
|
|
l.append("{attr}={value}".format(attr=attr, value=repr(value)))
|
|
return "{classname}({attrs})".format(classname=self.__class__.__name__,
|
|
attrs=", ".join(l))
|
|
|
|
|
|
def _sign(x):
|
|
return int(copysign(1, x))
|
|
|
|
# vim:ts=4:sw=4:et
|
|
|