Python 时间类 获取年月周 开始时间

import datetime
from datetime import timedelta


def get_day_str():
    return datetime.datetime.strftime(datetime.datetime.now(), "%Y-%m-%d")


def local2utc(local_dtm):
    # 本地时间转 UTC 时间（ -8:00 ）
    return datetime.datetime.utcfromtimestamp(local_dtm.timestamp())


def get_week_start():
    """获取本周的开始时间"""
    now = datetime.datetime.now()
    now = datetime.datetime.combine(now, datetime.datetime.min.time())
    this_week_start = now - timedelta(days=now.weekday())
    return this_week_start


def get_today():
    """获取今天的时间"""
    now = datetime.date.today()
    dt = datetime.datetime.combine(now, datetime.datetime.min.time())
    return dt


def get_month_start():
    """获取这个月的开始时间"""
    now = datetime.datetime.now()
    this_month_start = datetime.datetime(now.year, now.month, 1)
    return this_month_start


def get_year_start():
    now = datetime.datetime.now()
    now = datetime.datetime(year=now.year, month=1, day=1)
    return now