How to get last day of a month from a given date?

Question

For example, the given date is 04/04/1924 and I want to find out the last day of February of the year 1924.

I came up with the add_month but it

Answer 1

Get First and Last Date of the Month Just change the Month digit to get the first and last date of the month

 select
  to_date('01/'|| '07/' || to_char(sysdate, 'YYYY'), 'dd/mm/yyyy') first,
  last_day(to_date('01/'|| '07/' || to_char(sysdate, 'YYYY'), 'dd/mm/yyyy')) last
  from  dual

Result:

first         last
-------------------------- 
01/02/2017  28/02/2017