The Created At field is a reference field for entities (Requirements, Scripts, Script Assignments and Incidents) and is date/time stamp of when the entity was created.
The date formats supported are:
You can also include a time component:
To find all items that were created between 2 dates, you can use the greater than or equal to and less than or equal to operators:
CreatedAt >= "2011-10-24" AND CreatedAt <= "2011-11-02"
Alternative you can use the short-hand range syntax:
CreatedAt IN ["2011-10-24", "2011-11-02"]
=, <, >, <=, >=, IN, !=, NOT IN, IS, IS NOT