RQ constructor.

Usage:

• obj = rq(year, quarter)

• obj = rq(dateString)

• obj = rq(datenumber)

Inputs:

• year: Year of the date.

• quarter: Quarter of the date (1, 2, 3, or 4).

• dateString: A string in the format ‘mm/dd/yyyy’ or ‘yyyyQp’ where p=1,2,3,4 or ‘yyyy-mm-dd’

Example:

dateObj = rq(2023, 2);

dateObj = rq(‘2023Q2’);

dateObj = rq(‘04/01/2023’);

dateObj = rq(737999);

See also rd, rw, rm, rh, ra, ry