MySQL time, string, timestamp convert each other

time to string

• select date_format(now(), ‘%Y-%m-%d’);
  结果：2018-05-02

time to timestamp

• select unix_timestamp(now());
  result: 1525263383

String to time

• select str_to_date('2018-05-02', '%Y-%m-%d %H');
  result: 2018-05-02 00:00:00

String to Timestamp

• select unix_timestamp('2018-05-02');
  result: 1525263383

Timestamp to time

• select from_unixtime(1525263383);
  result: 2018-05-02 20:16:23

Timestamp to string

• select from_unixtime(1525263383,'%Y-%d');
  result: 2018-02