class
	DATE_VALUE

General
	cluster: time
	description: "Values of date"

Ancestors
	DATE_MEASUREMENT

Queries
	compact_date: INTEGER
	date_default_format_string: STRING
	day: INTEGER
	days_in_i_th_month (i, y: INTEGER): INTEGER
	Days_in_leap_year: INTEGER
	days_in_month: INTEGER
	Days_in_non_leap_year: INTEGER
	Days_in_week: INTEGER
	days_text: ARRAY [STRING]
	is_leap_year (y: INTEGER): BOOLEAN
	long_days_text: ARRAY [STRING]
	long_months_text: ARRAY [STRING]
	Max_weeks_in_year: INTEGER
	month: INTEGER
	Months_in_year: INTEGER
	months_text: ARRAY [STRING]
	year: INTEGER

Commands
	set_day (d: INTEGER)
	set_month (m: INTEGER)
	set_year (y: INTEGER)