Oracle Date Functions

Oracle Date FunctionsVersion 11.1 Would you like to take a class from Ace Director Dan Morgan the author of this library?

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 DateCurrent DateCURRENT_DATE
SYSDATESELECT TO_CHAR(CURRENT_DATE, 'DD-MON-YYYY HH:MI:SS') FROM dual;

SELECT TO_CHAR(SYSDATE, 'DD-MON-YYYY HH:MI:SS') FROM dual;Formats

DayMonthYearFill ModeJulian DateDMMYYFMJDDMONYYYY  DDTH RR  DAY RRRR  

 + AND -+<date> + <integer>SELECT SYSDATE + 1 FROM dual;-<date> - <integer>SELECT SYSDATE - 1 FROM dual; ADD_MONTHS
Add A Month To A DateADD_MONTHS(<date>, <number of months_integer>SELECT add_months(SYSDATE, 2) FROM dual;

-- but be aware of what it is doing
SELECT add_months(TO_DATE('27-JAN-2007'), 1) FROM dual;

SELECT add_months(TO_DATE('28-JAN-2007'), 1) FROM dual;

SELECT add_months(TO_DATE('29-JAN-2007'), 1) FROM dual;

SELECT add_months(TO_DATE('30-JAN-2007'), 1) FROM dual;

SELECT add_months(TO_DATE('31-JAN-2007'), 1) FROM dual;

SELECT add_months(TO_DATE('01-FEB-2007'), 1) FROM dual; CURRENT_DATE
Returns the current date of the server as a value in the Gregorian calendar of datatype DATE col sessiontimezone format a30

SELECT sessiontimezone, current_date
FROM dual;

ALTER SESSION SET TIME_ZONE = '-5:0';

SELECT sessiontimezone, current_date
FROM dual;

ALTER SESSION SET NLS_DATE_FORMAT = 'DD-MON-YYYY HH24:MI:SS';

SELECT sessiontimezone, current_date
FROM dual;

ALTER SESSION SET TIME_ZONE = '-7:0';

SELECT sessiontimezone, current_date
FROM dual;

ALTER SESSION SET NLS_DATE_FORMAT = 'DD-MON-YYYY'; DUMPReturns The Number Of Bytes And Datatype Of A ValueDUMP(<value>)SELECT DUMP(SYSDATE) FROM dual; GREATEST
Return the Latest DateLEAST(<date>, <date>, <date>, ...)CREATE TABLE t (
datecol1 DATE,
datecol2 DATE,
datecol3 DATE)
PCTFREE 0;

INSERT INTO t VALUES (SYSDATE+23, SYSDATE-10, SYSDATE-24);
INSERT INTO t VALUES (SYSDATE-15, SYSDATE, SYSDATE+15);
INSERT INTO t VALUES (SYSDATE-7, SYSDATE-18, SYSDATE-9);
COMMIT;

SELECT * FROM t;

SELECT GREATEST(datecol1, datecol2, datecol3)
FROM t; INTERVAL
Interval to adjust date-timeINTERVAL '<integer>' <unit>SELECT TO_CHAR(SYSDATE, 'HH:MI:SS')
FROM dual;

SELECT TO_CHAR(SYSDATE + INTERVAL '10' MINUTE, 'HH:MI:SS')
FROM dual;

SELECT TO_CHAR(SYSDATE - INTERVAL '10' MINUTE, 'HH:MI:SS')
FROM dual; LAST_DAYReturns The Last Date Of A MonthLAST_DAY(<date>)SELECT * FROM t;

SELECT LAST_DAY(datecol1) FROM t; LEASTReturn the Earliest DateLEAST(<date>, <date>, <date>, ...)SELECT * FROM t;

SELECT LEAST(datecol1, datecol2, datecol3) FROM t; LENGTHReturns length in charactersLENGTH(<date>)SELECT LENGTH(last_ddl_time) FROM user_objects; LENGTHBReturns length in bytesLENGTHB(<date>)SELECT LENGTHB(last_ddl_time) FROM user_objects;Note: Additional forms of LENGTH (LENGTHC, LENGTH2, and LENGTH4) are also available. MAXReturn the Latest DateMAX(<date>)SELECT * FROM t;

SELECT MAX(datecol1) FROM t; MINReturn the Earliest DateMIN(<date>)SELECT * FROM t;

SELECT MIN(datecol1) FROM t; MONTHS_BETWEENReturns The Months Separating Two DatesMONTHS_BETWEEN(<latest_date>, <earliest_date>)SELECT MONTHS_BETWEEN(SYSDATE+365, SYSDATE-365) FROM dual;

SELECT MONTHS_BETWEEN(SYSDATE-365, SYSDATE+365) FROM dual; NEW_TIME
Returns the date and time in time zone zone2 when date and time in time zone zone1 are dateBefore using this function, you must set the NLS_DATE_FORMAT parameter to display 24-hour time.SELECT NEW_TIME(TO_DATE('11-10-99 01:23:45',
'MM-DD-YY HH24:MI:SS'), 'AST', 'PST') "New Date and Time"
FROM dual;

ALTER SESSION SET NLS_DATE_FORMAT = 'DD-MON-YYYY HH24:MI:SS';

SELECT NEW_TIME(TO_DATE('11-10-99 01:23:45',
'MM-DD-YY HH24:MI:SS'), 'AST', 'PST') "New Date and Time"
FROM dual;

ALTER SESSION SET NLS_DATE_FORMAT = 'DD-MON-YYYY'; NEXT_DAYDate of next specified date following a dateNEXT_DAY(<date>, <day of the week>)

Options are SUN, MON, TUE, WED, THU, FRI, and SATSELECT NEXT_DAY(SYSDATE, 'FRI') FROM dual; ROUNDReturns date rounded to the unit specified by the format model. If you omit the format, the date is rounded to the nearest dayROUND(<date_value>, <format>)SELECT ROUND(TO_DATE('27-OCT-00'),'YEAR') NEW_YEAR
FROM dual; Spelled Out Using TO_CHAR
Spelled Demo

DDSPHH24SPMISPMMSPSSSP

SELECT TO_CHAR(TO_DATE('10:30:18', 'HH24:MI:SS'), 'HH24SP:MISP:SSSP')
FROM dual;

SELECT TO_CHAR(TO_DATE('01-JAN-2008', 'DD-MON-YYYY'), 'DDSP-MONTH-YYYYSP')
FROM dual;

SELECT TO_CHAR(TO_DATE('01-JAN-2008', 'DD-MM-YYYY'), 'DDSP-MMSP-YYYYSP')
FROM dual;

SELECT TO_CHAR(TO_DATE(sal,'J'), 'JSP')
FROM emp; SYSDATEReturns the current session DateTimeSYSDATESELECT SYSDATE FROM dual; TRUNC
Convert a date to the date at midnightTRUNC(<date_time>)CREATE TABLE t (
datecol DATE);

INSERT INTO t (datecol) VALUES (SYSDATE);

INSERT INTO t (datecol) VALUES (TRUNC(SYSDATE));

INSERT INTO t (datecol) VALUES (TRUNC(SYSDATE, 'HH'));

INSERT INTO t (datecol) VALUES (TRUNC(SYSDATE, 'MI'));

COMMIT;

SELECT TO_CHAR(datecol, 'DD-MON-YYYY HH:MI:SS')
FROM t;
Selectively remove part of the date information

Special thanks to Dave Hayes for reminding me of this.TRUNC(<date_time>, '<format>')SELECT TO_CHAR(SYSDATE, 'DD-MON-YYYY HH:MI:SS')
FROM dual;

-- first day of the month
SELECT TO_CHAR(TRUNC(SYSDATE, 'MM'), 'DD-MON-YYYY HH:MI:SS')
FROM dual;

SELECT TO_CHAR(TRUNC(SYSDATE, 'MON'), 'DD-MON-YYYY HH:MI:SS')
FROM dual;

SELECT TO_CHAR(TRUNC(SYSDATE, 'MONTH'), 'DD-MON-YYYY HH:MI:SS')
FROM dual;

-- first day of the year
SELECT TO_CHAR(TRUNC(SYSDATE, 'YYYY'), 'DD-MON-YYYY HH:MI:SS')
FROM dual;

SELECT TO_CHAR(TRUNC(SYSDATE, 'YEAR'), 'DD-MON-YYYY HH:MI:SS')
FROM dual;
Dates in WHERE Clause JoinsSELECT SYSDATE FROM dual;

ALTER SESSION SET NLS_DATE_FORMAT = 'DD-MON-YYYY HH24:MI:SS';

SELECT SYSDATE FROM dual;

/

/

ALTER SESSION SET NLS_DATE_FORMAT = 'DD-MON-YYYY';

CREATE TABLE t (
datecol DATE);

INSERT INTO t
(datecol)
VALUES
(SYSDATE);

SELECT * FROM t;

ALTER SESSION SET NLS_DATE_FORMAT = 'DD-MON-YYYY HH24:MI:SS';

SELECT * FROM t;

ALTER SESSION SET NLS_DATE_FORMAT = 'DD-MON-YYYY';

SELECT * FROM t;

SELECT SYSDATE FROM dual;

SELECT * FROM t
WHERE datecol = SYSDATE;

ALTER SESSION SET NLS_DATE_FORMAT = 'DD-MON-YYYY HH24:MI:SS';

SELECT * FROM t;

SELECT SYSDATE FROM dual;

SELECT TRUNC(SYSDATE) FROM dual;

SELECT * FROM t
WHERE TRUNC(datecol) = TRUNC(SYSDATE);

ALTER SESSION SET NLS_DATE_FORMAT = 'DD-MON-YYYY'; VSIZEReturns The Number Of Bytes Required By A ValueVSIZE(e IN DATE) RETURN NUMBERSELECT VSIZE(SYSDATE) FROM dual; Date Calculations
Returns A Day A Specified Number Of Days In The Future Skipping WeekendsCREATE OR REPLACE FUNCTION business_date (start_date DATE,
Days2Add NUMBER) RETURN DATE IS
 Counter  NATURAL := 0;
 CurDate  DATE := start_date;
 DayNum   POSITIVE;
 SkipCntr NATURAL := 0; 
BEGIN
  WHILE Counter < Days2Add LOOP
    CurDate := CurDate+1;
    DayNum := TO_CHAR(CurDate, 'D');

    IF DayNum BETWEEN 2 AND 6 THEN
      Counter := Counter + 1;
    ELSE
      SkipCntr := SkipCntr + 1;
    END IF;
  END LOOP;
  RETURN start_date + Counter + SkipCntr;
END business_date;
/
Business Date function, above, enhanced by Larry Benton to handle negative values for the days2add parameter.CREATE OR REPLACE FUNCTION business_date (start_date DATE, 
days2add NUMBER) RETURN DATE IS
 Counter NATURAL := 0;
 CurDate DATE := start_date;
 DayNum POSITIVE;
 SkipCntr NATURAL := 0;
 Direction INTEGER := 1;  -- days after start_date
 BusinessDays NUMBER := Days2Add;
BEGIN
  IF Days2Add < 0 THEN
    Direction := - 1; -- days before start_date
    BusinessDays := (-1) * BusinessDays;
  END IF;

  WHILE Counter < BusinessDays LOOP
    CurDate := CurDate + Direction;
    DayNum := TO_CHAR( CurDate, 'D');

    IF DayNum BETWEEN 2 AND 6 THEN
      Counter := Counter + 1;
    ELSE
      SkipCntr := SkipCntr + 1;
    END IF;
  END LOOP;

  RETURN start_date + (Direction * (Counter + SkipCntr));
END business_date;
/
Returns The First Day Of A MonthCREATE OR REPLACE FUNCTION fday_ofmonth(value_in DATE)
RETURN DATE IS
 vMo VARCHAR2(2);
 vYr VARCHAR2(4); 
BEGIN
  vMo := TO_CHAR(value_in, 'MM');
  vYr := TO_CHAR(value_in, 'YYYY');
  RETURN TO_DATE(vMo || '-01-' || vYr, 'MM-DD-YYYY'); 
EXCEPTION
  WHEN OTHERS THEN
    RETURN TO_DATE('01-01-1900', 'MM-DD-YYYY'); 
END fday_ofmonth;
/ Time Calculations
Returns The Number Of Seconds Between Two Date-Time ValuesCREATE OR REPLACE FUNCTION time_diff (
DATE_1 IN DATE, DATE_2 IN DATE) RETURN NUMBER IS

NDATE_1   NUMBER;
NDATE_2   NUMBER;
NSECOND_1 NUMBER(5,0);
NSECOND_2 NUMBER(5,0);

BEGIN
  -- Get Julian date number from first date (DATE_1)
  NDATE_1 := TO_NUMBER(TO_CHAR(DATE_1, 'J'));

  -- Get Julian date number from second date (DATE_2)
  NDATE_2 := TO_NUMBER(TO_CHAR(DATE_2, 'J'));

  -- Get seconds since midnight from first date (DATE_1)
  NSECOND_1 := TO_NUMBER(TO_CHAR(DATE_1, 'SSSSS'));

  -- Get seconds since midnight from second date (DATE_2)
  NSECOND_2 := TO_NUMBER(TO_CHAR(DATE_2, 'SSSSS'));

  RETURN (((NDATE_2 - NDATE_1) * 86400)+(NSECOND_2 - NSECOND_1));
END time_diff;
/Calculating time from seconds

Posted by John K. Hinsdale
12/30/06 to c.d.o.miscSELECT DECODE(FLOOR(999999/86400), 0, '',
              FLOOR(999999/86400) || ' day(s), ') || 
   TO_CHAR(TO_DATE(MOD(999999, 86400),'SSSSS'), 'HH24:MI:SS') AS elapsed
FROM dual;
Obtain counts per ten minute increment

Posted by Michele Cadot
03/09/08 to c.d.o.miscALTER SESSION SET NLS_DATE_FORMAT = 'DD-MON-YYYY HH24:MI:SS';

SELECT TRUNC(SYSDATE) + dbms_random.value(0,86400)/86400
FROM dual
CONNECT BY LEVEL <= 10;

WITH data AS (
  SELECT TRUNC(SYSDATE)+dbms_random.value(0,86400)/86400 h
  FROM dual
  CONNECT BY LEVEL <= 10)
SELECT TO_CHAR(h,'DD/MM/YYYY HH24:MI:SS') h, TO_CHAR(TRUNC(h)
 + TRUNC(TO_CHAR(h,'SSSSS')/600)/144, 'DD/MM/YYYY HH24:MI:SS') "10m"
FROM data
ORDER BY h; http://blog.csdn.net/tingqier/archive/2008/10/08/3033884.aspxRelated TopicsCastConversion FunctionsMiscellaneous FunctionsNumeric FunctionsString FunctionsTimestamp