Components of a date: such as the year or the month

We can extract the year, the month, the day of the month and the day of the week. Times may be extracted in a similar way. The SQL Standard specifies the understandably unpopular EXTRACT function.

Specific to Oracle
In addition to the standard Oracle has TO_CHAR. The TO_CHAR function can be used to convert a date into a string. The second parameter specifies the format. The following code may be used in the format string:
Four digit year

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