datetime转字符串

import datetime



data_now = datetime.datetime.now()

print(type(data_now))

data_str = str(data_now)

print(type(data_str))

print(data_str[:19])

data_strf = data_now.strftime("%Y-%m-%d %H:%m:%S")

print(type(data_strf))

print(data_strf)

print("%s-%.2d-%.2d" % (data_now.year, data_now.month, data_now.day))

---

<class 'datetime.datetime'>
<class 'str'>
2019-08-02 09:20:12
<class 'str'>
2019-08-02 09:08:12
2019-08-02