The three time and calendar related modules and operators in them are dealt with here. UTC and ISO8601 are used to express and represent time and time intervals; they are explained and the use of all related constructs illustrated. With epoch as reference date, time, their combinations, relations with time zone, and geographic locations are possible to be expressed and related in different ways. Access to calendar and calendar formation to different formats are also made possible. ‘Timeit’ module provides the framework to compare the efficacy of different routines and can be of use in code optimization.