import datetime as dt
monday_time = dt.datetime.strftime((dt.date.today()-dt.timedelta(dt.date.today().weekday())), '%Y-%m-%d')
import datetime as dt
last_month=(dt.date.today().replace(day=1)+ dt.timedelta(days=-1)).replace(day=1)
import datetime as dt
now_month=dt.date.today().replace(day=1)
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将“2021/11/11 8:45”的日期格式变为“2021-11-11”
strftime与strptime：
strptime()，按照特定时间格式将字符串转换为时间类型。
strftime()，将时间类型转为特定时间格式字符串。(str from time )
import datetime as dt
s = '2021/11/11 8:45'
a = dt.datetime.strptime(s,'%Y/%m/%d %H:%M')
b = dt.datetime.strftime(a,'%Y-%m-%d')
print('b=',b)
