A Datamart stores time dimensions (week, month, quarter and year) for the pricing dates. To get a time dimension value, a DMCalendar instance (Datamart Calendar) can be used.
For example, the date "2018-01-24" falls in the week "2018-W04"; which can be retrieved by the getWeek(date) method of a DMCalendar instance:
Similarly, other time dimensions such as Month, Quarter and Year can be retrieved by getMonth(date), getQuarter(date) and getYear(date) methods respectively.