NameErron in Python3 : xx = str(23-Jun-2019 [8:41:44])
Traceback (most recent call last):
  File "<pyshell#4>", line 1, in <module>
    xx = str(23-Jun-2019 [8:41:44])
NameError: name 'Jun' is not defined

I am using Python3 in Windows 7 machine.