日期处理

import calendar,datetime

now = datetime.datetime.now()
year = now.year
month = now.month
weekday,monthRange = calendar.monthrange(year,month)
# 获取当月第一天
first_day = datetime.date(year=year,month=month,day=1)
# 获取当月最后一天
last_day = datetime.date(year=year,month=month,day=monthRange)