Oracle SQL Developer

Storing Datetime DataOracle Database provides various functions for calculating and converting datetimedata. For examples in SQL statements, see Using Date Functions.Be careful when using a date format such as DD-MON-YY. The YY indicates the year inthe current century. For example, 31-DEC-92 is December 31, 2092, not 1992 asyou might expect. If you want to indicate years in any century other than the currentone, use a format mask such as the default RR.You can use the following techniques to change the default date format on a moreglobal level:■To change on an instance-wide basis, use the NLS_DATE_FORMAT parameter.■ To change during a session, use the ALTER SESSION statement.For more information on these techniques, see Working in a Global Environment.See Also:■■Oracle Database SQL Reference for more information about date andtime formatsOracle Database Concepts for information about Julian dates. OracleDatabase Julian dates might not be compatible with Julian datesgenerated by other date algorithms.Data Types: Usage Information 5-7