How to find the Uptime of MySQL Instance

How can I find, since when my MySQL Instance is running

login to your MySQL server and execute

mysql> show status like 'Uptime';
+---------------+---------+
| Variable_name | Value   |
+---------------+---------+
| Uptime        | 2507101 |
+---------------+---------+
1 row in set (0.00 sec)

Note:- The Uptime value displayed here is in Seconds. My MySQL instance is running since
2507101 seconds

OR

mysql> \s;
--------------
mysql  Ver 14.14 Distrib 5.1.73, for redhat-linux-gnu (x86_64) using readline 5.1
Connection id:          289795
Current database:
Current user:           oracle@localhost
SSL:                    Not in use
Current pager:          stdout
Using outfile:          ''
Using delimiter:        ;
Server version:         5.1.73-log Source distribution
Protocol version:       10
Connection:             Localhost via UNIX socket
Server characterset:    utf8
Db     characterset:    utf8
Client characterset:    latin1
Conn.  characterset:    latin1
UNIX socket:            /var/lib/mysql/mysql.sock
Uptime:                 29 days 21 min 3 sec
Threads: 6  Questions: 14313149  Slow queries: 9  Opens: 77  Flush tables: 1  Open tables: 57  Queries per second avg: 5.709
--------------
ERROR:
No query specified

OR

mysql> status
--------------
mysql  Ver 14.14 Distrib 5.1.73, for redhat-linux-gnu (x86_64) using readline 5.1
Connection id:          289820
Current database:
Current user:           oracle@localhost
SSL:                    Not in use
Current pager:          stdout
Using outfile:          ''
Using delimiter:        ;
Server version:         5.1.73-log Source distribution
Protocol version:       10
Connection:             Localhost via UNIX socket
Server characterset:    utf8
Db     characterset:    utf8
Client characterset:    latin1
Conn.  characterset:    latin1
UNIX socket:            /var/lib/mysql/mysql.sock
Uptime:                 29 days 28 min 45 sec
Threads: 6  Questions: 14314196  Slow queries: 9  Opens: 77  Flush tables: 1  Open tables: 57  Queries per second avg: 5.708
--------------
mysql>