script to check the uptime of a mysql database server?

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';

 mysql> 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';

+----------------+---------------------+----------------------------+-------------+

| Uptime_seconds | Now                 | Up since                   | Uptime_days |

+----------------+---------------------+----------------------------+-------------+

| 100752         | 2021-12-27 10:02:34 | 2021-12-26 06:03:22.000000 |           1 |

+----------------+---------------------+----------------------------+-------------+

1 row in set (0.01 sec)

mysql> SHOW GLOBAL STATUS LIKE '%UPTIME%';

+---------------------------+--------+

| Variable_name             | Value  |

+---------------------------+--------+

| Uptime                    | 100776 |

| Uptime_since_flush_status | 100776 |

+---------------------------+--------+

2 rows in set (0.00 sec)