# xarray.core.accessor_dt.DatetimeAccessor.isocalendar

#### DatetimeAccessor.isocalendar()[[source]](https://github.com/pydata/xarray/blob/main/xarray/core/accessor_dt.py#L389-L411)

Dataset containing ISO year, week number, and weekday.

### Notes

The iso year and weekday differ from the nominal year and weekday.