1 from datetime import *
2 import calendar
3
4 def get_monthago_date():
5 nowtime = date.today()
6 nowtime_year = nowtime.year
7 nowtime_month = nowtime.month
8 nowtime_day = nowtime.day
9
10 onemonthago = nowtime_month - 1 #减去一个月，判断是否为0，为0表示当前月份是1月份
11
12 if onemonthago == 0: #如果当前月份为1月份，就需要设置年份减去1，月份为12月
13 oneyearago = nowtime_year - 1
14 onemonthago = 12
15 monthindex, monthdays = calendar.monthrange(oneyearago, onemonthago) #获取上一个月有多少天
16
17 if monthdays >= nowtime_day: #如果上一个月的总天数大于当前日期就用当前的日期
18 onemonthdate = nowtime.replace(year=oneyearago, month=onemonthago, day=nowtime_day)
19 else: #如果上一个月的总天数都小于当前的日期(2月28和3.31这种情况)就使用上个月的最大日期
20 onemonthdate = nowtime.replace(year=oneyearago, month=onemonthago, day=monthdays)
21
22 return onemonthdate.strftime('%Y-%m-%d')
23 else:
24 monthindex, monthdays = calendar.monthrange(nowtime_year, onemonthago)
25
26 if monthdays >= nowtime_day:
27 onemonthdate = nowtime.replace(year=nowtime_year, month=onemonthago, day=nowtime_day)
28 else:
29 onemonthdate = nowtime.replace(year=nowtime_year, month=onemonthago, day=monthdays)
30
31 return onemonthdate.strftime('%Y-%m-%d')
