date_extract_d
Extract the day from the date as an integer
Examples:
date_extract_d(to_fixed_timestamp('2017-12-13T00:24:53Z'))
-- Result: "13"
date_extract_d(to_floating_timestamp('2017-12-13T00:24:53'))
-- Result: "13"
date_extract_d(to_fixed_timestamp('2017-12-13T00:24:53+0930'))
-- Result: "12"
a -> number