How Oracle Interprets Two-Digit Years : TRUNC « Date Timestamp Functions « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Date Timestamp Functions » TRUNC

13. 24. 3. How Oracle Interprets Two-Digit Years

The Oracle database stores all four digits of the year.

Oracle interprets the century depending on whether the YY or RR format is being used for two-digit year.

TRUNC(): truncate May 25, 2005, to the first day in the year


SQL> 

SQL>

SQL> SELECT TRUNC(TO_DATE('25-MAY-2005'), 'YYYY') FROM dual;



TRUNC(TO_

---------

01-JAN-05



SQL>

13. 24. TRUNC
	13. 24. 1.	TRUNC() parameter list
	13. 24. 2.	TRUNC(x[, unit]) truncates x.
	13. 24. 3.	How Oracle Interprets Two-Digit Years
	13. 24. 4.	Truncates May 25, 2005, to the first day in the month
	13. 24. 5.	Truncates 7:45:26 P.M. on May 25, 2005 to the hour
	13. 24. 6.	Examples of the TRUNC function being applied to datetime values
	13. 24. 7.	TRUNC(date_in,'YYYY')
	13. 24. 8.	TRUNC(date_in,'MM')
	13. 24. 9.	TRUNC(): truncate May 25, 2005, to the first day in the year
	13. 24. 10.	Use TRUNC(date_variable) when you want to extract a date from a timestamp

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