WebHelpDesk API selecting tickets older than a specific date

tcatgcsd

This works to show open tickets:

     var url = "url/.../Tickets %3D 'Open')&" + credentials;

It returns a string like this: 

     [19-06-05 08:28:11:146 PDT] [{"id":11111,"type":"Ticket","lastUpdated":"2019-06-05T10:09:54Z","shortSubject":"

I want to find tickets older than a specific date - I thought one of these might work, based on what I saw it return above but they do not.

     var url = "url/.../Tickets < '2014-01-01')&" + credentials;

     var url = "url/.../Tickets < '2014-01-01')&" + credentials;

Any ideas on how to state the qualifier?