z=datetime.datetime(2016,12,5)
z=datetime.datetime.strptime('20150112','%Y%m%d')

for x in ['01','02','03','04','05','06','07','08','09','10','11','12']:
 d='2015'+x+'12'
 z=datetime.datetime.strptime(d,'%Y%m%d')#当天
 z1=z+pd.tseries.offsets.DateOffset(days=1-z.day)#当月第一天
 z2=z+pd.tseries.offsets.DateOffset(months=1,days=-z.day)#当月最后一天
 x1 = z + pd.tseries.offsets.DateOffset(months=-((z.month - 1) % 3), days=1 - z.day) # 当季第一天
 x2 = z + pd.tseries.offsets.DateOffset(months=3 - ((z.month - 1) % 3), days=-z.day) # 当季最后一天
 y1 = z + pd.tseries.offsets.DateOffset(months=1 - z.month, days=1 - z.day) # 当年第一天
 y2 = z + pd.tseries.offsets.DateOffset(years=1,months=1 - z.month, days= - z.day) # 当年最后一天
 
print(d,':','月：',z1,z2,'季：',x1,x2)
print(y1.strftime("%Y-%m-%d"),y2.strftime("%Y-%m-%d"))

datetime.datetime.now()+pd.tseries.offsets.DateOffset(days=-1)

datetime.datetime.now().weekday()

start = datetime.datetime.strptime('2018-01-01', '%Y-%m-%d')
end = datetime.datetime.strptime('2018-01-08', '%Y-%m-%d')
for x in pd.date_range(start,end,freq="3D"): #50min等
 print(x.strftime('%Y%m%d'))