What date did Jatin Shah and Shalini Chandran perform?
create table table_18278508_2 (date_performed varchar, main_contestant varchar, co_contestant__yaar_vs_pyaar_ varchar, PRIMARY KEY (date_performed))
select date_performed from table_18278508_2 where main_contestant = "jatin shah" and co_contestant__yaar_vs_pyaar_ = "shalini chandran"