python datetime模块计算上周任意一天的日期
作者:
陆_志东 | 来源:发表于
2018-07-24 00:27 被阅读0次from datetime import datetime
weekdays = ["Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"]
def get_previous_byday(dayname,start_date=None):
if start_date is None:
start_date = datetime.today()
day_num = start_date.weekday()
day_num_target = weekdays.index(dayname)
days_ago = (7 + day_num -day_num_target) % 7 # 这里括号里面加7 是因为防止days_ago 出现负值
if days_ag0 == 0:
days_ago = 7
target_date = start_date - datedelta(days=days_ago)
return target_date
本文标题：python datetime模块计算上周任意一天的日期
本文链接：https://www.haomeiwen.com/subject/ajusmftx.html
网友评论