CREATE TABLE table_18278508_2 (date_performed VARCHAR, main_contestant VARCHAR, co_contestant__yaar_vs_pyaar_ VARCHAR)
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"