代码：
import datetime
# 得到现在的时间
now = datetime.datetime.now()
# YYYY-MM-DD日期格式
date_now = now.date()
def get_date_month(mon=0):
'''
:param mon: 获取当前时间X月之前的时间
:return: YYYY-MM
'''
# 当前时间X个月前
last_m = (int(now.year) * 12 + int(now.month) - mon) % 12
last_y = int((int(now.year) * 12 + int(now.month) - mon) / 12)
last_mon = '%s-%s' % (last_y, last_m)
return last_mon
# 当前时间13个月前
last_13mon = get_date_month(13);
# 当前时间20年前
last_20year = int(now.year) - 20;
# 获取去年同期
last_year = int(now.year) - 1
last_1year_date = date_now.replace(year=last_year)
print(now)
print(date_now)
print(last_13mon)
print(last_20year)
print(last_1year_date)
输出结果：
2020-02-23 21:31:56.130753
2020-02-23
2019-1
2000
2019-02-23
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