Syntax: week() Return: Integer. Returns which day of the week falls on, with Sunday as day 1. Parameter
Syntax: week_end [monday_first] Return: Last day of the week containing the date . week,last day
Syntax: week_start [monday_first] Return: First day of the week containing the date
Syntax: week_of_year [monday_first] Returns: The week number of the year for the date