Oracle Data/Time Functions

SELECT
to_char(to_date ('20-AUG-1988'), 'RRRR') calendar_year
 ,to_char(to_date ('20-AUG-1988'), 'WW') week_of_year
 ,to_char(to_date ('20-AUG-1988'), 'Q') quarter_of_year
 ,to_char(to_date ('20-AUG-1988'), 'MM') month_of_year
 ,to_char(to_date ('20-AUG-1988'), 'W') week_of_month
 ,to_char(to_date ('20-AUG-1988'), 'D') day_of_the_week
 ,to_char(to_date ('20-AUG-1988'), 'DAY') name_of_the_day
 FROM DUAL;


 SELECT
 add_months (sysdate, 12) add_months
 ,current_date system_date
 ,current_timestamp system_timestamp
 ,dbtimezone timezone
 ,extract (year from sysdate) extract_year
 ,extract (month from sysdate) extract_month
 ,extract (day from sysdate) extract_date
 ,last_day (sysdate) month_last_day
 ,months_between (sysdate, '20-aug-1988') months_between
 ,new_time(sysdate, 'PST', 'AST') newtime
 ,next_day(sysdate, 'SUNDAY') next_weekday
 ,round (to_date (sysdate),'YEAR') rounding_year
 ,round (to_date (sysdate),'Q') rounding_quarter
 ,round (to_date (sysdate),'MONTH') rounding_month
 ,sysdate sys_date
 ,systimestamp sys_timestamp
 ,trunc (sysdate) trunc_time
 FROM DUAL;

 SELECT least('01-jan-2016','01-jan-2017') least_date
      ,greatest ('01-jan-2016','31-dec-2015') greatest_date
      , sign (to_date('01-jan-2016') - to_date('01-jan-2017')) date_sign_ex1
      , sign (to_date('01-jan-2020') - to_date('01-jan-2017')) date_sign_ex2
      , sign (to_date('01-jan-2019') - to_date('31-dec-2017')) date_sign_ex2
      , to_date('01-jan-2016') - to_date('01-jan-2017') subtract_dates
 FROM DUAL;

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