My dataframe have one column date
which has the following data:
0 2019/5/20 22:49:29
1 2019/5/20 23:18:23
2 2019/3/8 9:11:35
3 2019/3/8 9:19:58
4 2019/5/20 22:57:12
5 2019/3/8 9:06:41
How can I convert it to format year-month
:
0 2019-05
1 2019-05
2 2019-03
3 2019-03
4 2019-05
5 2019-03
Thank you.