Is it possible to get the last restore date of a MySQL instance?
I've just tested your solution about the "CREATE_TIME" field in information_schema and I think it's the good one, look : 

[root@localhost] [MFO] mysql&gt; select * from information_schema.tables where table_name = "myisammfo"\G
*************************** 1. row ***************************
  TABLE_CATALOG: NULL
   TABLE_SCHEMA: MFO
     TABLE_NAME: myisammfo
     TABLE_TYPE: BASE TABLE
         ENGINE: MyISAM
        VERSION: 10
     ROW_FORMAT: Fixed
     TABLE_ROWS: 2
 AVG_ROW_LENGTH: 7
    DATA_LENGTH: 14
MAX_DATA_LENGTH: 1970324836974591
   INDEX_LENGTH: 1024
      DATA_FREE: 0
 AUTO_INCREMENT: NULL
    CREATE_TIME: 2013-03-05 15:15:22
    UPDATE_TIME: 2013-03-05 15:17:58
     CHECK_TIME: 2013-03-05 15:18:28
TABLE_COLLATION: latin1_swedish_ci
       CHECKSUM: NULL
 CREATE_OPTIONS:
  TABLE_COMMENT:
1 row in set (0.01 sec)


I did a mysqldump of MFO DB:

predator:~# mysqldump -uroot -p --databases MFO &gt;/tmp/MFO.SQL


Then loaded it:

predator:~# mysql -uroot -p &lt;/tmp/MFO.SQL


Now the CREATE_TIME is today:

predator:~# mysql -uroot -p
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 86261
Server version: 5.0.51a-24+lenny5 (Debian)

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

[root@localhost] [(none)] mysql&gt; select * from information_schema.tables where table_name = "myisammfo"\G
*************************** 1. row ***************************
  TABLE_CATALOG: NULL
   TABLE_SCHEMA: MFO
     TABLE_NAME: myisammfo
     TABLE_TYPE: BASE TABLE
         ENGINE: MyISAM
        VERSION: 10
     ROW_FORMAT: Fixed
     TABLE_ROWS: 2
 AVG_ROW_LENGTH: 7
    DATA_LENGTH: 14
MAX_DATA_LENGTH: 1970324836974591
   INDEX_LENGTH: 1024
      DATA_FREE: 0
 AUTO_INCREMENT: NULL
    CREATE_TIME: 2013-10-02 16:45:56
    UPDATE_TIME: 2013-10-02 16:45:56
     CHECK_TIME: NULL
TABLE_COLLATION: latin1_swedish_ci
       CHECKSUM: NULL
 CREATE_OPTIONS:
  TABLE_COMMENT:
1 row in set (0.00 sec)


Best regards. 

Max.