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relativedelta.py
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""" Copyright (c) 2003-2010 Gustavo Niemeyer <gustavo@niemeyer.net> This module offers extensions to the standard python 2.3+ datetime module. """ __author__ = "Gustavo Niemeyer <gustavo@niemeyer.net>" __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