`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 (Sunday) of the week that contains the specified date.

Example

1SELECT OrderDate as "date", week_first_day(OrderDate) as "week_first_day" FROM "dates_sample_data";

date	week_first_day
2015-01-21 15:30:00	2015-01-18 00:00:00
2015-01-21 00:00:00	2015-01-18 00:00:00
2015-01-31 10:00:30	2015-01-25 00:00:00
2015-02-03 15:30:00	2015-02-01 00:00:00
2016-01-21 23:59:59	2016-01-17 00:00:00
2015-10-31 23:59:59	2015-10-25 00:00:00
2015-12-03 00:00:00	2015-11-29 00:00:00
2016-01-11 03:30:00	2016-01-10 00:00:00
2016-01-11 03:30:00	2016-01-10 00:00:00