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Oracle® Database Reference
10g Release 2 (10.2)

Part Number B14237-02
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NLS_TIMESTAMP_FORMAT

Property Description
Parameter type String
Syntax NLS_TIMESTAMP_FORMAT = "format"
Default value Derived from NLS_TERRITORY
Modifiable ALTER SESSION
Range of values Any valid datetime format mask

NLS_TIMESTAMP_FORMAT defines the default timestamp format to use with the TO_CHAR and TO_TIMESTAMP functions.

The value must be surrounded by quotation marks as follows:

NLS_TIMESTAMP_FORMAT = 'YYYY-MM-DD HH:MI:SS.FF'

You can specify the value of NLS_TIMESTAMP_FORMAT by setting it in the initialization parameter file. You can specify its value for a client as a client environment variable.

You can also alter the value of NLS_TIMESTAMP_FORMAT by changing its value in the initialization parameter and then restarting the instance. To alter the value during a session use the ALTER SESSION SET statement.