code: public function actionTo($version)
      {
          if (($namespaceVersion = $this->extractNamespaceMigrationVersion($version)) !== false) {
              $this->migrateToVersion($namespaceVersion);
          } elseif (($migrationName = $this->extractMigrationVersion($version)) !== false) {
              $this->migrateToVersion($migrationName);
          } elseif ((string) (int) $version == $version) {
              $this->migrateToTime($version);
          } elseif (($time = strtotime($version)) !== false) {
              $this->migrateToTime($time);
          } else {
              throw new Exception("The version argument must be either a timestamp (e.g. 101129_185401),\n the full name of a migration (e.g. m101129_185401_create_user_table),\n the full namespaced name of a migration (e.g. app\\migrations\\M101129185401CreateUserTable),\n a UNIX timestamp (e.g. 1392853000), or a datetime string parseable\nby the strtotime() function (e.g. 2014-02-15 13:00:50).");
          }
      }
docs: Upgrades or downgrades till the specified version.
  
  Can also downgrade versions to the certain apply time in the past by providing
  a UNIX timestamp or a string parseable by the strtotime() function. This means
  that all the versions applied after the specified certain time would be reverted.
  
  This command will first revert the specified migrations, and then apply
  them again. For example,
  
  ```
  yii migrate/to 101129_185401                          # using timestamp
  yii migrate/to m101129_185401_create_user_table       # using full name
  yii migrate/to 1392853618                             # using UNIX timestamp
  yii migrate/to "2014-02-15 13:00:50"                  # using strtotime() parseable string
  yii migrate/to app\migrations\M101129185401CreateUser # using full namespace name
  ```
  
  @param string $version either the version name or the certain time value in the past
  that the application should be migrated to. This can be either the timestamp,
  the full name of the migration, the UNIX timestamp, or the parseable datetime
  string.
  @throws Exception if the version argument is invalid.