strptime的问题

#encoding=utf-8
from datetime import datetime
date=datetime.now()
data_year=date.strftime('%Y-%m-%d')
print(data_year)
data_day=date.strftime('%H:%M:%S')
print(data_day)
year=date.strftime('%Y')
print(year)
month=date.strftime('%m')
print(month)
day=date.strftime('%d')
print(day)
nowtime=year+month+day
now_time=datetime.strptime(nowtime,'%Y%m%d')
print(now_time)

为啥自动加上00：00：00啊