polars.Expr.dt.days#

Expr.dt.days() → Expr[source]#

Extract the days from a Duration type.

Returns:

Expr: Expression of data type Int64.

Examples

>>> from datetime import datetime
>>> df = pl.DataFrame(
...     {
...         "date": pl.date_range(
...             datetime(2020, 3, 1), datetime(2020, 5, 1), "1mo", eager=True
...         ),
...     }
... )
>>> df.select(
...     [
...         pl.col("date"),
...         pl.col("date").diff().dt.days().alias("days_diff"),
...     ]
... )
shape: (3, 2)
┌─────────────────────┬───────────┐
│ date                ┆ days_diff │
│ ---                 ┆ ---       │
│ datetime[μs]        ┆ i64       │
╞═════════════════════╪═══════════╡
│ 2020-03-01 00:00:00 ┆ null      │
│ 2020-04-01 00:00:00 ┆ 31        │
│ 2020-05-01 00:00:00 ┆ 30        │
└─────────────────────┴───────────┘