034_py_datetime - kotaproj/study_zenpan GitHub Wiki
https://qiita.com/7110/items/4ece0ce9be0ce910ee90
>>> from datetime import datetime
>>> datetime.now()
datetime.datetime(2021, 1, 25, 20, 34, 7, 869307)
>>> str(datetime.now())
'2021-01-25 20:34:13.326453'
>>> dtnow.strftime('%Y_%m%d_%H%M_%S')
'2021_0125_2035_18'