#include <db_cxx.h> int DbEnv::set_tx_timestamp(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 DbEnv::set_tx_timestamp() method configures operations performed
         using the specified DbEnv  handle, not all
         operations performed on the underlying database environment.
    
         The DbEnv::set_tx_timestamp() method may not be called after the
         DbEnv::open()  method is
         called.
    
         The DbEnv::set_tx_timestamp() 
            
            
                method either returns a non-zero error value or throws an
                exception that encapsulates a non-zero error value on
                failure, and returns 0 on success.
            
        
    
                         The DbEnv::set_tx_timestamp() 
            
            
                method may fail and throw a DbException 
                exception, encapsulating one of the following non-zero errors, or return one
                of the following non-zero errors: