MySQL Uptime 

SELECT

  VARIABLE_VALUE AS Uptime_seconds,

  NOW() AS “Now”,

  NOW() – INTERVAL VARIABLE_VALUE SECOND AS “Up since”,

  DATEDIFF(NOW(), NOW() – INTERVAL VARIABLE_VALUE SECOND) AS “Uptime_days”

FROM performance_schema.session_status

WHERE VARIABLE_NAME = ‘Uptime’;

Output Example:

+—————-+———————+—————————-+————-+

| Uptime_seconds | Now                 | Up since                   | Uptime_days |

+—————-+———————+—————————-+————-+

| 16430228       | 2021-04-09 14:11:58 | 2020-10-01 10:14:50.000000 |         190 |

+—————-+———————+—————————-+————-+