Equivalent of DATETIME and TIME of sqlite query as NSPredicate

What is the predicate equivalent of SQL query

DATETIME('now','+0 seconds’) > DATETIME(ZDATE,TIME(ZEND_TIME))

where

ZDATE is date in format YYYY-MM-DD HH:mm:ss
ZEND_TIME is date in format YYYY-MM-DD HH:mm:ss

I am getting the following error when I am directly using it in NSPredicate

Unable to parse function name 'DATETIME' into supported selector (DATETIME)