# fiscal_week_first_day({date})

Accepts a `DateTime`, `DateOnly`, or legacy Date object as input. Returns an object of the same type that corresponds to the first day (Monday) of the fiscal week that contains the specified date.

## Example

```nolang
SELECT OrderDate as "date", fiscal_week_first_day(OrderDate) as "fiscal_week_first_day" FROM "dates_sample_data";
```

| date                | fiscal_week_first_day |
| ------------------- | --------------------- |
| 2015-01-21 15:30:00 | 2015-01-19 00:00:00   |
| 2015-01-21 00:00:00 | 2015-01-19 00:00:00   |
| 2015-01-31 10:00:30 | 2015-01-26 00:00:00   |
| 2015-02-03 15:30:00 | 2015-02-02 00:00:00   |
| 2016-01-21 23:59:59 | 2016-01-18 00:00:00   |
| 2015-10-31 23:59:59 | 2015-10-26 00:00:00   |
| 2015-12-03 00:00:00 | 2015-11-30 00:00:00   |
| 2016-01-11 03:30:00 | 2016-01-11 00:00:00   |
| 2016-01-11 03:30:00 | 2016-01-11 00:00:00   |