from __future__ import annotations

from datetime import datetime, timedelta


def day_bounds(now: datetime) -> tuple[datetime, datetime]:
    start = now.replace(hour=0, minute=0, second=0, microsecond=0)
    return start, start + timedelta(days=1)


def month_bounds(now: datetime) -> tuple[datetime, datetime]:
    start = now.replace(day=1, hour=0, minute=0, second=0, microsecond=0)
    if start.month == 12:
        end = start.replace(year=start.year + 1, month=1)
    else:
        end = start.replace(month=start.month + 1)
    return start, end