"""
Copyright (c) 2003-2010 Gustavo Niemeyer
This module offers extensions to the standard python 2.3+
datetime module.
"""
__author__ = "Gustavo Niemeyer "
__license__ = "PSF License"
import datetime
import calendar
__all__ = ["relativedelta", "MO", "TU", "WE", "TH", "FR", "SA", "SU"]
class weekday(object):
__slots__ = ["weekday", "n"]
def __init__(self, weekday, n=None):
self.weekday = weekday
self.n = n
def __call__(self, n):
if n == self.n:
return self
else:
return self.__class__(self.weekday, n)
def __eq__(self, other):
try:
if self.weekday != other.weekday or self.n != other.n:
return False
except AttributeError:
return False
return True
def __repr__(self):
s = ("MO", "TU", "WE", "TH", "FR", "SA", "SU")[self.weekday]
if not self.n:
return s
else:
return "%s(%+d)" % (s, self.n)
MO, TU, WE, TH, FR, SA, SU = weekdays = tuple([weekday(x) for x in range(7)])
class relativedelta:
"""
The relativedelta type is based on the specification of the excelent
work done by M.-A. Lemburg in his mx.DateTime 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's two different ways to build a relativedelta instance. The
first one is passing it two date/datetime classes:
relativedelta(datetime1, datetime2)
And the other way is to use the following keyword arguments:
year, month, day, hour, minute, second, microsecond:
Absolute information.
years, months, weeks, days, hours, minutes, seconds, microseconds:
Relative information, may be negative.
weekday:
One of the weekday instances (MO, TU, etc). 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.
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.
Here is the behavior of operations with relativedelta:
1) Calculate the absolute year, using the 'year' argument, or the
original datetime year, if the argument is not present.
2) Add the relative 'years' argument to the absolute year.
3) Do steps 1 and 2 for month/months.
4) Calculate the absolute day, using the 'day' argument, or the
original datetime day, if the argument is not present. Then,
subtract from the day until it fits in the year and month
found after their operations.
5) Add the relative 'days' argument to the absolute day. Notice
that the 'weeks' argument is multiplied by 7 and added to
'days'.
6) Do steps 1 and 2 for hour/hours, minute/minutes, second/seconds,
microsecond/microseconds.
7) If the 'weekday' argument is present, calculate the weekday,
with the given (wday, nth) tuple. wday is the index of the
weekday (0-6, 0=Mon), and nth is the number of weeks to add
forward or backward, depending on its signal. Notice that if
the calculated date is already Monday, for example, using
(0, 1) or (0, -1) won't change the day.
"""
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:
if not isinstance(dt1, datetime.date) or \
not isinstance(dt2, datetime.date):
raise TypeError, "relativedelta only diffs datetime/date"
if type(dt1) is not type(dt2):
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
months = (dt1.year*12+dt1.month)-(dt2.year*12+dt2.month)
self._set_months(months)
dtm = self.__radd__(dt2)
if dt1 < dt2:
while dt1 > dtm:
months += 1
self._set_months(months)
dtm = self.__radd__(dt2)
else:
while dt1 < dtm:
months -= 1
self._set_months(months)
dtm = self.__radd__(dt2)
delta = dt1 - dtm
self.seconds = delta.seconds+delta.days*86400
self.microseconds = delta.microseconds
else:
self.years = years
self.months = months
self.days = days+weeks*7
self.leapdays = leapdays
self.hours = hours
self.minutes = minutes
self.seconds = seconds
self.microseconds = microseconds
self.year = year
self.month = month
self.day = day
self.hour = hour
self.minute = minute
self.second = second
self.microsecond = microsecond
if type(weekday) is int:
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 = self.microseconds//abs(self.microseconds)
div, mod = divmod(self.microseconds*s, 1000000)
self.microseconds = mod*s
self.seconds += div*s
if abs(self.seconds) > 59:
s = self.seconds//abs(self.seconds)
div, mod = divmod(self.seconds*s, 60)
self.seconds = mod*s
self.minutes += div*s
if abs(self.minutes) > 59:
s = self.minutes//abs(self.minutes)
div, mod = divmod(self.minutes*s, 60)
self.minutes = mod*s
self.hours += div*s
if abs(self.hours) > 23:
s = self.hours//abs(self.hours)
div, mod = divmod(self.hours*s, 24)
self.hours = mod*s
self.days += div*s
if abs(self.months) > 11:
s = self.months//abs(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
def _set_months(self, months):
self.months = months
if abs(self.months) > 11:
s = self.months//abs(self.months)
div, mod = divmod(self.months*s, 12)
self.months = mod*s
self.years = div*s
else:
self.years = 0
def __radd__(self, other):
if not isinstance(other, datetime.date):
raise TypeError, "unsupported type for add operation"
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 __rsub__(self, other):
return self.__neg__().__radd__(other)
def __add__(self, other):
if not isinstance(other, relativedelta):
raise TypeError, "unsupported type for add operation"
return relativedelta(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 or self.year,
month=other.month or self.month,
day=other.day or self.day,
weekday=other.weekday or self.weekday,
hour=other.hour or self.hour,
minute=other.minute or self.minute,
second=other.second or self.second,
microsecond=other.second or self.microsecond)
def __sub__(self, other):
if not isinstance(other, relativedelta):
raise TypeError, "unsupported type for sub operation"
return relativedelta(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 or self.year,
month=other.month or self.month,
day=other.day or self.day,
weekday=other.weekday or self.weekday,
hour=other.hour or self.hour,
minute=other.minute or self.minute,
second=other.second or self.second,
microsecond=other.second or self.microsecond)
def __neg__(self):
return relativedelta(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 __nonzero__(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)
def __mul__(self, other):
f = float(other)
return relativedelta(years=self.years*f,
months=self.months*f,
days=self.days*f,
hours=self.hours*f,
minutes=self.minutes*f,
seconds=self.seconds*f,
microseconds=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)
def __eq__(self, other):
if not isinstance(other, relativedelta):
return False
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.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 __ne__(self, other):
return not self.__eq__(other)
def __div__(self, other):
return self.__mul__(1/float(other))
def __repr__(self):
l = []
for attr in ["years", "months", "days", "leapdays",
"hours", "minutes", "seconds", "microseconds"]:
value = getattr(self, attr)
if value:
l.append("%s=%+d" % (attr, value))
for attr in ["year", "month", "day", "weekday",
"hour", "minute", "second", "microsecond"]:
value = getattr(self, attr)
if value is not None:
l.append("%s=%s" % (attr, `value`))
return "%s(%s)" % (self.__class__.__name__, ", ".join(l))
# vim:ts=4:sw=4:et