Using rest webServices to Query obs table with Specific value of type datetime

[dkayiwa (Daniel Kayiwa)]

WebServices Rest - Ability to Return a count how many Observations for a Specified Concept match a value

Is it possible to query the webservices end points for counts say How many observations have a concept that matches a specified value How many patients have an observation that matches such a value Or are these done via the Reporting Rest API?