Date time type

 

Data Type	“Zero” Value
DATE	'0000-00-00'
TIME	'00:00:00'
DATETIME	'0000-00-00 00:00:00'
TIMESTAMP	'0000-00-00 00:00:00'
YEAR	0000

https://dev.mysql.com/doc/refman/8.0/en/date-and-time-types.html