#include <db.h> int DB_ENV->set_tx_timestamp(DB_ENV *dbenv, time_t *timestamp);
Recover to the time specified by timestamp rather than to the most current possible date.
Once a database environment has been upgraded to a new version of Berkeley DB involving a log format change (see Upgrading Berkeley DB installations), it is no longer possible to recover to a specific time before that upgrade.
         The DB_ENV->set_tx_timestamp() method configures operations performed
         using the specified DB_ENV  handle, not all
         operations performed on the underlying database environment.
    
         The DB_ENV->set_tx_timestamp() method may not be called after the
         DB_ENV->open()  method is
         called.
    
         The DB_ENV->set_tx_timestamp() 
            
                  method returns a non-zero error value on failure and 0 on success.
            
            
        
    
                         The DB_ENV->set_tx_timestamp() 
            
                 method may fail and return one of the following non-zero errors: