Method start_of

src/pendulum/date.py:333–350

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

(self, unit: str)

    # MODIFIERS

    def start_of(self, unit: str) -> Self:
        """
        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
        """
        if unit not in self._MODIFIERS_VALID_UNITS:
            raise ValueError(f'Invalid unit "{unit}" for start_of()')

        return cast("Self", getattr(self, f"_start_of_{unit}")())

    def end_of(self, unit: str) -> Self:
        """