熊猫系列索引日期时间排序

Question

I'm trying to sort a Pandas Series which has dtype=<M8[ns

Yet, the sorting goes well for the first few entries, and then becomes quite random.

I'm using this code

d_series = pd.Series(dates_count)
d_series.index = pd.to_datetime(d_series.index)
d_series.sort_index(inplace=True)
d_series

The specific issue is here:

2018-11-04      3
2018-11-06    338
2018-11-07    319

Since we didn't have those months yet. To confirm that the date-notation is not different from what I expect, this is how the series starts:

2018-03-15      2
2018-03-21      1
2018-03-22      1

As you can tell, the formatting is 'yyyy/mm/dd' but somehow going wrong.

Answer 1

The problem was that I did not specify how to sort the dates, so I think the best guess was wrong. By defining the format, it was fixed.