check date between two dates in oracle code example

Example 1: oracle difference between two dates in seconds

SELECT (END_DT - START_DT) * 60 * 60 * 24 FROM MY_TABLE;   	-- Seconds
SELECT (END_DT - START_DT) * 60 * 24 FROM MY_TABLE;   		-- Minutes
SELECT (END_DT - START_DT) * 24 FROM MY_TABLE;   			-- Hours

Example 2: oracle difference between two dates in days

v_numvar := dt1-dt2;