Grow makes it easy to call a custom date table in any metric within a Master SQL report. We've set up a table called _datesTable that goes back to 2013. A simple SQL query is all you need. For example:
select date from _datesTable where date(date) >= date('now', '-30 days’);
The above query will return the last 30 days and can be used in any SQL query in Edit Metric.