polars.Series.dt.ordinal_day#

Series.dt.ordinal_day() → Series[source]#

Extract ordinal day from underlying date representation.

Applies to Date and Datetime columns.

Returns the day of year starting from 1. The return value ranges from 1 to 366. (The last day of year differs by years.)

Returns:

Ordinal day as UInt32

Examples

>>> from datetime import datetime
>>> start = datetime(2001, 1, 1)
>>> stop = datetime(2001, 3, 1)
>>> date = pl.date_range(start, stop, interval="1mo")
>>> date
shape: (3,)
Series: '' [datetime[μs]]
[
        2001-01-01 00:00:00
        2001-02-01 00:00:00
        2001-03-01 00:00:00
]
>>> date.dt.ordinal_day()
shape: (3,)
Series: '' [u32]
[
        1
        32
        60
]