Gorm GORM time.Time tag default value invalid

GORM Playground Link

https://github.com/go-gorm/playground/pull/1

Description

type Student struct {
    Name    string     `gorm:"default:'abc';size:10;not null"`
    LastSync  time.Time  `gorm:"default:'1970-01-01 08:00:00+08';not null"`
}

 `name` varchar(10) NOT NULL DEFAULT '111',
 `last_sync` datetime DEFAULT CURRENT_TIMESTAMP,

When I create a record

db.Create(&Student{})

the debug sql like this, and there is no last_sync field.

INSERT INTO `student` (`name`) VALUES ('abc');

Why last_sync default 1970-01-01 08:00:00+08 is invalid in debug sql, but name default abc is valid ? How to set use go default value or use mysql default value only ?

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