String 

YYYY-MM-DD-HH24:MI:SS (or the default Oracle date format) 

Dynamic. Scope = ALTER SYSTEM. 

None 

FIXED_DATE lets you set a constant date that SYSDATE will always return instead of the current date. This parameter is useful primarily for testing. The value can be in the format shown above or in the default Oracle date format, without a time.

Specify the value without quotation marks or with double quotation marks. Do not use single quotation marks.