Method: Returns expected number of items on the page in case of date ordering.

Method: Returns true if there are any intervals that need to be filled in the response.

Method: Returns date format to be used as grouping clause in SQL.

Method: Returns quarter for the DateTime.

Method: Returns simple week number for the DateTime, for week starting on $first_day_of_week.

Method: Returns ISO 8601 week number for the DateTime, if week starts on Monday, otherwise returns simple week number.

Method: Returns time interval id for the DateTime.

Method: Calculates number of time intervals between two dates, closed interval on both sides.

Method: Converts local datetime to GMT/UTC time.

Method: Returns default ‘before’ parameter for the reports.