pandas.Series.dt.dayofyear

Series.dt.dayofyear

The ordinal day of the year.

Examples

For Series:

>>> s = pd.Series(["1/1/2020 10:00:00 00:00", "2/1/2020 11:00:00 00:00"])
>>> s = pd.to_datetime(s)
>>> s
0   2020-01-01 10:00:00 00:00
1   2020-02-01 11:00:00 00:00
dtype: datetime64[ns, UTC]
>>> s.dt.dayofyear
0    1
1   32
dtype: int32

For DatetimeIndex:

>>> idx = pd.DatetimeIndex(["1/1/2020 10:00:00 00:00",
...                         "2/1/2020 11:00:00 00:00"])
>>> idx.dayofyear
Index([1, 32], dtype='int32')