CREATE TABLE table_18278508_2 (date_performed VARCHAR2, main_contestant VARCHAR2, co_contestant__yaar_vs_pyaar_ VARCHAR2)

What date did Jatin Shah and Shalini Chandran perform?
SELECT date_performed FROM table_18278508_2 WHERE main_contestant = "Jatin Shah" AND co_contestant__yaar_vs_pyaar_ = "Shalini Chandran"
SELECT "date_performed" FROM "table_18278508_2" WHERE "Jatin Shah" = "main_contestant" AND "Shalini Chandran" = "co_contestant__yaar_vs_pyaar_"