mysql日期转时间戳，时间戳转日期，取年份

默认从1970-01-01 00:00:00.000000年从0开始

select now() as '今天',UNIX_TIMESTAMP('1999-01-01 00:00:00') as '日期转时间戳',from_unixtime(UNIX_TIMESTAMP('1999-01-01 00:00:00')) as '时间戳转日期',DATE_FORMAT( from_unixtime(UNIX_TIMESTAMP('1999-01-01 00:00:00')) ,'%Y') as '取年份';

https://blog.csdn.net/fwj_ntu/article/details/86680053