MySQL 8.4 Reference Manual Including MySQL NDB Cluster 8.4
The YEAR type is a 1-byte type used to
represent year values. It can be declared as
YEAR with an implicit display width of 4
characters, or equivalently as YEAR(4) with
an explicit display width.
he YEAR(4) data type using an
explicit display width is deprecated and you should expect
support for it to be removed in a future version of MySQL.
Instead, use YEAR without a
display width, which has the same meaning.
MySQL displays YEAR values in
YYYY format, with a range of
1901 to 2155, and
0000.
YEAR accepts input values in a variety of
formats:
As 4-digit strings in the range '1901' to
'2155'.
As 4-digit numbers in the range 1901 to
2155.
As 1- or 2-digit strings in the range '0'
to '99'. MySQL converts values in the
ranges '0' to '69' and
'70' to '99' to
YEAR values in the ranges
2000 to 2069 and
1970 to 1999.
As 1- or 2-digit numbers in the range 0
to 99. MySQL converts values in the
ranges 1 to 69 and
70 to 99 to
YEAR values in the ranges
2001 to 2069 and
1970 to 1999.
The result of inserting a numeric 0 has a
display value of 0000 and an internal
value of 0000. To insert zero and have it
be interpreted as 2000, specify it as a
string '0' or '00'.
As the result of functions that return a value that is
acceptable in YEAR context, such as
NOW().
If strict SQL mode is not enabled, MySQL converts invalid
YEAR values to 0000. In
strict SQL mode, attempting to insert an invalid
YEAR value produces an error.
See also Section 13.2.9, “2-Digit Years in Dates”.