Finally i got answer.
post_type=event&meta_query%5B0%5D%5Bkey%5D=date_short_order&meta_query%5B0%5D%5Bvalue%5D=$today&meta_query%5B0%5D%5Bcompare%5D=%3C&meta_query%5B0%5D%5Btype%5D=DATE post_type=event&meta_query%5B0%5D%5Bkey%5D=date_short_order&meta_query%5B0%5D%5Bvalue%5D=$today&meta_query%5B0%5D%5Bcompare%5D=%3C&meta_query%5B0%5D%5Btype%5D=DATE