Extract Date Parts
SELECT current_date
     , EXTRACT(dow FROM current_date) AS day_of_week
     , EXTRACT(week FROM current_date) AS week_of_year
     , EXTRACT(quarter FROM current_date) AS quarter;
/*
current_date | day_of_week | week | quarter
-------------+-------------+------+--------
2019-04-28   |           0 |   17 |       2
(1 row)
*/
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