Tests to see if we can and should update a specific item.

Updates an item, if appropriate.

Class for generating SQL clauses that filter a primary query according to date.

Constructor.

Builds a MySQL format date/time based on some query parameters.

Builds a query string for comparing time values (hour, minute, second).

Builds and validates a value string based on the comparison operator.

Determines and validates what comparison operator to use.

Generate WHERE clause to be appended to a main query.

Turns a single date clause into pieces for a WHERE clause.