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Diffstat (limited to 'pendulum/date.py')
-rw-r--r-- | pendulum/date.py | 891 |
1 files changed, 891 insertions, 0 deletions
diff --git a/pendulum/date.py b/pendulum/date.py new file mode 100644 index 0000000..f11164e --- /dev/null +++ b/pendulum/date.py @@ -0,0 +1,891 @@ +from __future__ import absolute_import +from __future__ import division + +import calendar +import math + +from datetime import date +from datetime import timedelta + +import pendulum + +from .constants import FRIDAY +from .constants import MONDAY +from .constants import MONTHS_PER_YEAR +from .constants import SATURDAY +from .constants import SUNDAY +from .constants import THURSDAY +from .constants import TUESDAY +from .constants import WEDNESDAY +from .constants import YEARS_PER_CENTURY +from .constants import YEARS_PER_DECADE +from .exceptions import PendulumException +from .helpers import add_duration +from .mixins.default import FormattableMixin +from .period import Period + + +class Date(FormattableMixin, date): + + # Names of days of the week + _days = { + SUNDAY: "Sunday", + MONDAY: "Monday", + TUESDAY: "Tuesday", + WEDNESDAY: "Wednesday", + THURSDAY: "Thursday", + FRIDAY: "Friday", + SATURDAY: "Saturday", + } + + _MODIFIERS_VALID_UNITS = ["day", "week", "month", "year", "decade", "century"] + + # Getters/Setters + + def set(self, year=None, month=None, day=None): + return self.replace(year=year, month=month, day=day) + + @property + def day_of_week(self): + """ + Returns the day of the week (0-6). + + :rtype: int + """ + return self.isoweekday() % 7 + + @property + def day_of_year(self): + """ + Returns the day of the year (1-366). + + :rtype: int + """ + k = 1 if self.is_leap_year() else 2 + + return (275 * self.month) // 9 - k * ((self.month + 9) // 12) + self.day - 30 + + @property + def week_of_year(self): + return self.isocalendar()[1] + + @property + def days_in_month(self): + return calendar.monthrange(self.year, self.month)[1] + + @property + def week_of_month(self): + first_day_of_month = self.replace(day=1) + + return self.week_of_year - first_day_of_month.week_of_year + 1 + + @property + def age(self): + return self.diff(abs=False).in_years() + + @property + def quarter(self): + return int(math.ceil(self.month / 3)) + + # String Formatting + + def to_date_string(self): + """ + Format the instance as date. + + :rtype: str + """ + return self.strftime("%Y-%m-%d") + + def to_formatted_date_string(self): + """ + Format the instance as a readable date. + + :rtype: str + """ + return self.strftime("%b %d, %Y") + + def __repr__(self): + return ( + "{klass}(" + "{year}, {month}, {day}" + ")".format( + klass=self.__class__.__name__, + year=self.year, + month=self.month, + day=self.day, + ) + ) + + # COMPARISONS + + def closest(self, dt1, dt2): + """ + Get the closest date from the instance. + + :type dt1: Date or date + :type dt2: Date or date + + :rtype: Date + """ + dt1 = self.__class__(dt1.year, dt1.month, dt1.day) + dt2 = self.__class__(dt2.year, dt2.month, dt2.day) + + if self.diff(dt1).in_seconds() < self.diff(dt2).in_seconds(): + return dt1 + + return dt2 + + def farthest(self, dt1, dt2): + """ + Get the farthest date from the instance. + + :type dt1: Date or date + :type dt2: Date or date + + :rtype: Date + """ + dt1 = self.__class__(dt1.year, dt1.month, dt1.day) + dt2 = self.__class__(dt2.year, dt2.month, dt2.day) + + if self.diff(dt1).in_seconds() > self.diff(dt2).in_seconds(): + return dt1 + + return dt2 + + def is_future(self): + """ + Determines if the instance is in the future, ie. greater than now. + + :rtype: bool + """ + return self > self.today() + + def is_past(self): + """ + Determines if the instance is in the past, ie. less than now. + + :rtype: bool + """ + return self < self.today() + + def is_leap_year(self): + """ + Determines if the instance is a leap year. + + :rtype: bool + """ + return calendar.isleap(self.year) + + def is_long_year(self): + """ + Determines if the instance is a long year + + See link `<https://en.wikipedia.org/wiki/ISO_8601#Week_dates>`_ + + :rtype: bool + """ + return Date(self.year, 12, 28).isocalendar()[1] == 53 + + def is_same_day(self, dt): + """ + Checks if the passed in date is the same day as the instance current day. + + :type dt: Date or date + + :rtype: bool + """ + return self == dt + + def is_anniversary(self, dt=None): + """ + Check if its the anniversary. + + Compares the date/month values of the two dates. + + :rtype: bool + """ + if dt is None: + dt = Date.today() + + instance = self.__class__(dt.year, dt.month, dt.day) + + return (self.month, self.day) == (instance.month, instance.day) + + # the additional method for checking if today is the anniversary day + # the alias is provided to start using a new name and keep the backward compatibility + # the old name can be completely replaced with the new in one of the future versions + is_birthday = is_anniversary + + # ADDITIONS AND SUBSTRACTIONS + + def add(self, years=0, months=0, weeks=0, days=0): + """ + Add duration to the instance. + + :param years: The number of years + :type years: int + + :param months: The number of months + :type months: int + + :param weeks: The number of weeks + :type weeks: int + + :param days: The number of days + :type days: int + + :rtype: Date + """ + dt = add_duration( + date(self.year, self.month, self.day), + years=years, + months=months, + weeks=weeks, + days=days, + ) + + return self.__class__(dt.year, dt.month, dt.day) + + def subtract(self, years=0, months=0, weeks=0, days=0): + """ + Remove duration from the instance. + + :param years: The number of years + :type years: int + + :param months: The number of months + :type months: int + + :param weeks: The number of weeks + :type weeks: int + + :param days: The number of days + :type days: int + + :rtype: Date + """ + return self.add(years=-years, months=-months, weeks=-weeks, days=-days) + + def _add_timedelta(self, delta): + """ + Add timedelta duration to the instance. + + :param delta: The timedelta instance + :type delta: pendulum.Duration or datetime.timedelta + + :rtype: Date + """ + if isinstance(delta, pendulum.Duration): + return self.add( + years=delta.years, + months=delta.months, + weeks=delta.weeks, + days=delta.remaining_days, + ) + + return self.add(days=delta.days) + + def _subtract_timedelta(self, delta): + """ + Remove timedelta duration from the instance. + + :param delta: The timedelta instance + :type delta: pendulum.Duration or datetime.timedelta + + :rtype: Date + """ + if isinstance(delta, pendulum.Duration): + return self.subtract( + years=delta.years, + months=delta.months, + weeks=delta.weeks, + days=delta.remaining_days, + ) + + return self.subtract(days=delta.days) + + def __add__(self, other): + if not isinstance(other, timedelta): + return NotImplemented + + return self._add_timedelta(other) + + def __sub__(self, other): + if isinstance(other, timedelta): + return self._subtract_timedelta(other) + + if not isinstance(other, date): + return NotImplemented + + dt = self.__class__(other.year, other.month, other.day) + + return dt.diff(self, False) + + # DIFFERENCES + + def diff(self, dt=None, abs=True): + """ + Returns the difference between two Date objects as a Period. + + :type dt: Date or None + + :param abs: Whether to return an absolute interval or not + :type abs: bool + + :rtype: Period + """ + if dt is None: + dt = self.today() + + return Period(self, Date(dt.year, dt.month, dt.day), absolute=abs) + + def diff_for_humans(self, other=None, absolute=False, locale=None): + """ + Get the difference in a human readable format in the current locale. + + When comparing a value in the past to default now: + 1 day ago + 5 months ago + + When comparing a value in the future to default now: + 1 day from now + 5 months from now + + When comparing a value in the past to another value: + 1 day before + 5 months before + + When comparing a value in the future to another value: + 1 day after + 5 months after + + :type other: Date + + :param absolute: removes time difference modifiers ago, after, etc + :type absolute: bool + + :param locale: The locale to use for localization + :type locale: str + + :rtype: str + """ + is_now = other is None + + if is_now: + other = self.today() + + diff = self.diff(other) + + return pendulum.format_diff(diff, is_now, absolute, locale) + + # MODIFIERS + + def start_of(self, unit): + """ + Returns a copy of the instance with the time reset + with the following rules: + + * day: time to 00:00:00 + * week: date to first day of the week and time to 00:00:00 + * month: date to first day of the month and time to 00:00:00 + * year: date to first day of the year and time to 00:00:00 + * decade: date to first day of the decade and time to 00:00:00 + * century: date to first day of century and time to 00:00:00 + + :param unit: The unit to reset to + :type unit: str + + :rtype: Date + """ + if unit not in self._MODIFIERS_VALID_UNITS: + raise ValueError('Invalid unit "{}" for start_of()'.format(unit)) + + return getattr(self, "_start_of_{}".format(unit))() + + def end_of(self, unit): + """ + Returns a copy of the instance with the time reset + with the following rules: + + * week: date to last day of the week + * month: date to last day of the month + * year: date to last day of the year + * decade: date to last day of the decade + * century: date to last day of century + + :param unit: The unit to reset to + :type unit: str + + :rtype: Date + """ + if unit not in self._MODIFIERS_VALID_UNITS: + raise ValueError('Invalid unit "%s" for end_of()' % unit) + + return getattr(self, "_end_of_%s" % unit)() + + def _start_of_day(self): + """ + Compatibility method. + + :rtype: Date + """ + return self + + def _end_of_day(self): + """ + Compatibility method + + :rtype: Date + """ + return self + + def _start_of_month(self): + """ + Reset the date to the first day of the month. + + :rtype: Date + """ + return self.set(self.year, self.month, 1) + + def _end_of_month(self): + """ + Reset the date to the last day of the month. + + :rtype: Date + """ + return self.set(self.year, self.month, self.days_in_month) + + def _start_of_year(self): + """ + Reset the date to the first day of the year. + + :rtype: Date + """ + return self.set(self.year, 1, 1) + + def _end_of_year(self): + """ + Reset the date to the last day of the year. + + :rtype: Date + """ + return self.set(self.year, 12, 31) + + def _start_of_decade(self): + """ + Reset the date to the first day of the decade. + + :rtype: Date + """ + year = self.year - self.year % YEARS_PER_DECADE + + return self.set(year, 1, 1) + + def _end_of_decade(self): + """ + Reset the date to the last day of the decade. + + :rtype: Date + """ + year = self.year - self.year % YEARS_PER_DECADE + YEARS_PER_DECADE - 1 + + return self.set(year, 12, 31) + + def _start_of_century(self): + """ + Reset the date to the first day of the century. + + :rtype: Date + """ + year = self.year - 1 - (self.year - 1) % YEARS_PER_CENTURY + 1 + + return self.set(year, 1, 1) + + def _end_of_century(self): + """ + Reset the date to the last day of the century. + + :rtype: Date + """ + year = self.year - 1 - (self.year - 1) % YEARS_PER_CENTURY + YEARS_PER_CENTURY + + return self.set(year, 12, 31) + + def _start_of_week(self): + """ + Reset the date to the first day of the week. + + :rtype: Date + """ + dt = self + + if self.day_of_week != pendulum._WEEK_STARTS_AT: + dt = self.previous(pendulum._WEEK_STARTS_AT) + + return dt.start_of("day") + + def _end_of_week(self): + """ + Reset the date to the last day of the week. + + :rtype: Date + """ + dt = self + + if self.day_of_week != pendulum._WEEK_ENDS_AT: + dt = self.next(pendulum._WEEK_ENDS_AT) + + return dt.end_of("day") + + def next(self, day_of_week=None): + """ + Modify to the next occurrence of a given day of the week. + If no day_of_week is provided, modify to the next occurrence + of the current day of the week. Use the supplied consts + to indicate the desired day_of_week, ex. pendulum.MONDAY. + + :param day_of_week: The next day of week to reset to. + :type day_of_week: int or None + + :rtype: Date + """ + if day_of_week is None: + day_of_week = self.day_of_week + + if day_of_week < SUNDAY or day_of_week > SATURDAY: + raise ValueError("Invalid day of week") + + dt = self.add(days=1) + while dt.day_of_week != day_of_week: + dt = dt.add(days=1) + + return dt + + def previous(self, day_of_week=None): + """ + Modify to the previous occurrence of a given day of the week. + If no day_of_week is provided, modify to the previous occurrence + of the current day of the week. Use the supplied consts + to indicate the desired day_of_week, ex. pendulum.MONDAY. + + :param day_of_week: The previous day of week to reset to. + :type day_of_week: int or None + + :rtype: Date + """ + if day_of_week is None: + day_of_week = self.day_of_week + + if day_of_week < SUNDAY or day_of_week > SATURDAY: + raise ValueError("Invalid day of week") + + dt = self.subtract(days=1) + while dt.day_of_week != day_of_week: + dt = dt.subtract(days=1) + + return dt + + def first_of(self, unit, day_of_week=None): + """ + Returns an instance set to the first occurrence + of a given day of the week in the current unit. + If no day_of_week is provided, modify to the first day of the unit. + Use the supplied consts to indicate the desired day_of_week, ex. pendulum.MONDAY. + + Supported units are month, quarter and year. + + :param unit: The unit to use + :type unit: str + + :type day_of_week: int or None + + :rtype: Date + """ + if unit not in ["month", "quarter", "year"]: + raise ValueError('Invalid unit "{}" for first_of()'.format(unit)) + + return getattr(self, "_first_of_{}".format(unit))(day_of_week) + + def last_of(self, unit, day_of_week=None): + """ + Returns an instance set to the last occurrence + of a given day of the week in the current unit. + If no day_of_week is provided, modify to the last day of the unit. + Use the supplied consts to indicate the desired day_of_week, ex. pendulum.MONDAY. + + Supported units are month, quarter and year. + + :param unit: The unit to use + :type unit: str + + :type day_of_week: int or None + + :rtype: Date + """ + if unit not in ["month", "quarter", "year"]: + raise ValueError('Invalid unit "{}" for first_of()'.format(unit)) + + return getattr(self, "_last_of_{}".format(unit))(day_of_week) + + def nth_of(self, unit, nth, day_of_week): + """ + Returns a new instance set to the given occurrence + of a given day of the week in the current unit. + If the calculated occurrence is outside the scope of the current unit, + then raise an error. Use the supplied consts + to indicate the desired day_of_week, ex. pendulum.MONDAY. + + Supported units are month, quarter and year. + + :param unit: The unit to use + :type unit: str + + :type nth: int + + :type day_of_week: int or None + + :rtype: Date + """ + if unit not in ["month", "quarter", "year"]: + raise ValueError('Invalid unit "{}" for first_of()'.format(unit)) + + dt = getattr(self, "_nth_of_{}".format(unit))(nth, day_of_week) + if dt is False: + raise PendulumException( + "Unable to find occurence {} of {} in {}".format( + nth, self._days[day_of_week], unit + ) + ) + + return dt + + def _first_of_month(self, day_of_week): + """ + Modify to the first occurrence of a given day of the week + in the current month. If no day_of_week is provided, + modify to the first day of the month. Use the supplied consts + to indicate the desired day_of_week, ex. pendulum.MONDAY. + + :type day_of_week: int + + :rtype: Date + """ + dt = self + + if day_of_week is None: + return dt.set(day=1) + + month = calendar.monthcalendar(dt.year, dt.month) + + calendar_day = (day_of_week - 1) % 7 + + if month[0][calendar_day] > 0: + day_of_month = month[0][calendar_day] + else: + day_of_month = month[1][calendar_day] + + return dt.set(day=day_of_month) + + def _last_of_month(self, day_of_week=None): + """ + Modify to the last occurrence of a given day of the week + in the current month. If no day_of_week is provided, + modify to the last day of the month. Use the supplied consts + to indicate the desired day_of_week, ex. pendulum.MONDAY. + + :type day_of_week: int or None + + :rtype: Date + """ + dt = self + + if day_of_week is None: + return dt.set(day=self.days_in_month) + + month = calendar.monthcalendar(dt.year, dt.month) + + calendar_day = (day_of_week - 1) % 7 + + if month[-1][calendar_day] > 0: + day_of_month = month[-1][calendar_day] + else: + day_of_month = month[-2][calendar_day] + + return dt.set(day=day_of_month) + + def _nth_of_month(self, nth, day_of_week): + """ + Modify to the given occurrence of a given day of the week + in the current month. If the calculated occurrence is outside, + the scope of the current month, then return False and no + modifications are made. Use the supplied consts + to indicate the desired day_of_week, ex. pendulum.MONDAY. + + :type nth: int + + :type day_of_week: int or None + + :rtype: Date + """ + if nth == 1: + return self.first_of("month", day_of_week) + + dt = self.first_of("month") + check = dt.format("YYYY-MM") + for i in range(nth - (1 if dt.day_of_week == day_of_week else 0)): + dt = dt.next(day_of_week) + + if dt.format("YYYY-MM") == check: + return self.set(day=dt.day) + + return False + + def _first_of_quarter(self, day_of_week=None): + """ + Modify to the first occurrence of a given day of the week + in the current quarter. If no day_of_week is provided, + modify to the first day of the quarter. Use the supplied consts + to indicate the desired day_of_week, ex. pendulum.MONDAY. + + :type day_of_week: int or None + + :rtype: Date + """ + return self.set(self.year, self.quarter * 3 - 2, 1).first_of( + "month", day_of_week + ) + + def _last_of_quarter(self, day_of_week=None): + """ + Modify to the last occurrence of a given day of the week + in the current quarter. If no day_of_week is provided, + modify to the last day of the quarter. Use the supplied consts + to indicate the desired day_of_week, ex. pendulum.MONDAY. + + :type day_of_week: int or None + + :rtype: Date + """ + return self.set(self.year, self.quarter * 3, 1).last_of("month", day_of_week) + + def _nth_of_quarter(self, nth, day_of_week): + """ + Modify to the given occurrence of a given day of the week + in the current quarter. If the calculated occurrence is outside, + the scope of the current quarter, then return False and no + modifications are made. Use the supplied consts + to indicate the desired day_of_week, ex. pendulum.MONDAY. + + :type nth: int + + :type day_of_week: int or None + + :rtype: Date + """ + if nth == 1: + return self.first_of("quarter", day_of_week) + + dt = self.replace(self.year, self.quarter * 3, 1) + last_month = dt.month + year = dt.year + dt = dt.first_of("quarter") + for i in range(nth - (1 if dt.day_of_week == day_of_week else 0)): + dt = dt.next(day_of_week) + + if last_month < dt.month or year != dt.year: + return False + + return self.set(self.year, dt.month, dt.day) + + def _first_of_year(self, day_of_week=None): + """ + Modify to the first occurrence of a given day of the week + in the current year. If no day_of_week is provided, + modify to the first day of the year. Use the supplied consts + to indicate the desired day_of_week, ex. pendulum.MONDAY. + + :type day_of_week: int or None + + :rtype: Date + """ + return self.set(month=1).first_of("month", day_of_week) + + def _last_of_year(self, day_of_week=None): + """ + Modify to the last occurrence of a given day of the week + in the current year. If no day_of_week is provided, + modify to the last day of the year. Use the supplied consts + to indicate the desired day_of_week, ex. pendulum.MONDAY. + + :type day_of_week: int or None + + :rtype: Date + """ + return self.set(month=MONTHS_PER_YEAR).last_of("month", day_of_week) + + def _nth_of_year(self, nth, day_of_week): + """ + Modify to the given occurrence of a given day of the week + in the current year. If the calculated occurrence is outside, + the scope of the current year, then return False and no + modifications are made. Use the supplied consts + to indicate the desired day_of_week, ex. pendulum.MONDAY. + + :type nth: int + + :type day_of_week: int or None + + :rtype: Date + """ + if nth == 1: + return self.first_of("year", day_of_week) + + dt = self.first_of("year") + year = dt.year + for i in range(nth - (1 if dt.day_of_week == day_of_week else 0)): + dt = dt.next(day_of_week) + + if year != dt.year: + return False + + return self.set(self.year, dt.month, dt.day) + + def average(self, dt=None): + """ + Modify the current instance to the average + of a given instance (default now) and the current instance. + + :type dt: Date or date + + :rtype: Date + """ + if dt is None: + dt = Date.today() + + return self.add(days=int(self.diff(dt, False).in_days() / 2)) + + # Native methods override + + @classmethod + def today(cls): + return pendulum.today().date() + + @classmethod + def fromtimestamp(cls, t): + dt = super(Date, cls).fromtimestamp(t) + + return cls(dt.year, dt.month, dt.day) + + @classmethod + def fromordinal(cls, n): + dt = super(Date, cls).fromordinal(n) + + return cls(dt.year, dt.month, dt.day) + + def replace(self, year=None, month=None, day=None): + year = year if year is not None else self.year + month = month if month is not None else self.month + day = day if day is not None else self.day + + return self.__class__(year, month, day) |