MySQL 8.0 Release Notes
MySQL 8.0 Source Code Documentation
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.
Note
As of MySQL 8.0.19, the YEAR(4)
data type with 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 8.0 does not support the 2-digit
YEAR(2) data type permitted in
older versions of MySQL. For instructions on converting to
4-digit YEAR, see
2-Digit YEAR(2) Limitations and Migrating to 4-Digit YEAR, in
MySQL 5.7 Reference Manual.
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
1901to2155.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'toYEARvalues in the ranges2000to2069and1970to1999.As 1- or 2-digit numbers in the range
0to99. MySQL converts values in the ranges1to69and70to99toYEARvalues in the ranges2001to2069and1970to1999.The result of inserting a numeric
0has a display value of0000and an internal value of0000. To insert zero and have it be interpreted as2000, specify it as a string'0'or'00'.As the result of functions that return a value that is acceptable in
YEARcontext, such asNOW().
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”.