polars_xdt.to_julian_date

polars_xdt.to_julian_date(expr: str | Expr) → Expr

Return the Julian date corresponding to given datetimes.

Examples

>>> from datetime import datetime
>>> import polars_xdt as xdt
>>> df = pl.DataFrame(
...     {
...         "date_col": [
...             datetime(2013, 1, 1, 0, 30),
...             datetime(2024, 1, 7, 13, 18, 51),
...         ],
...     }
... )
>>> with pl.Config(float_precision=10) as cfg:
...     df.with_columns(julian_date=xdt.to_julian_date("date_col"))
shape: (2, 2)
┌─────────────────────┬────────────────────┐
│ date_col            ┆ julian_date        │
│ ---                 ┆ ---                │
│ datetime[μs]        ┆ f64                │
╞═════════════════════╪════════════════════╡
│ 2013-01-01 00:30:00 ┆ 2456293.5208333335 │
│ 2024-01-07 13:18:51 ┆ 2460317.0547569445 │
└─────────────────────┴────────────────────┘