Python日期和星期互相转换

将特定日期转换成星期

# 将日期转换成星期几
import datetime


weekdays = ['星期一', '星期二', '星期三', '星期四', '星期五', '星期六', '星期日']


def date_to_weekday(date_str):
    """

    :param date_str: 日期字符串
    :return:
    """

    # 将字符串转换为日期对象
    date_obj = datetime.datetime.strptime(date_str, "%Y-%m-%d")

    weekday_number = date_obj.weekday()

    return weekdays[weekday_number]

print(date_to_weekday("2024-03-22"))  # 星期五

将星期转换成最近的日期

# 将日期转换成星期几
import datetime


weekdays = ['星期一', '星期二', '星期三', '星期四', '星期五', '星期六', '星期日']

# 将星期几转换成日期
def week_to_date(week_day):
    """

    :param week_day: 星期
    :return:
    """
    date_obj = datetime.datetime.now()
    weekday_number = date_obj.weekday()
    if weekdays[weekday_number] == week_day:
        return date_obj.strftime("%Y-%m-%d")
    # else:
    while True:
        date_obj = date_obj - datetime.timedelta(days=1)
        weekday_number = date_obj.weekday()
        if weekdays[weekday_number] == week_day:
            return date_obj.strftime("%Y-%m-%d")

print(week_to_date("星期一"))  # 2024-03-18