I want show chart dashboard in month custom.Ex: I select 01/2017 that mean chart show from 01/01/2017 to 31/01/2017. I find function getChartUrl() in vendor\magento\module-backend\Block\Dashboard\Graph.php return url image of chart but i can not override it.

list($  dateStart, $  dateEnd) = $  this->_collectionFactory->create()->getDateRange(         $  this->getDataHelper()->getParam('period'),         '',         '',         true     ); 

I find in vendor/magento/module-reports/Model/ResourceModel/Order/Collection.php can set custom date but in getChartUrl() have not. How custom it?

public function getDateRange($  range, $  customStart, $  customEnd, $  returnObjects = false) {     $  dateEnd = new \DateTime();     $  dateStart = new \DateTime();      // go to the end of a day     $  dateEnd->setTime(23, 59, 59);      $  dateStart->setTime(0, 0, 0);      switch ($  range) {         case '24h':             $  dateEnd = new \DateTime();             $  dateEnd->modify('+1 hour');             $  dateStart = clone $  dateEnd;             $  dateStart->modify('-1 day');             break;          case '7d':             // substract 6 days we need to include             // only today and not hte last one from range             $  dateStart->modify('-6 days');             break;          case '1m':             $  dateStart->setDate(                 $  dateStart->format('Y'),                 $  dateStart->format('m'),                 $  this->_scopeConfig->getValue(                     'reports/dashboard/mtd_start',                     \Magento\Store\Model\ScopeInterface::SCOPE_STORE                 )             );             break;          case 'custom':             $  dateStart = $  customStart ? $  customStart : $  dateEnd;             $  dateEnd = $  customEnd ? $  customEnd : $  dateEnd;             break;          case '1y':         case '2y':             $  startMonthDay = explode(                 ',',                 $  this->_scopeConfig->getValue(                     'reports/dashboard/ytd_start',                     \Magento\Store\Model\ScopeInterface::SCOPE_STORE                 )             );             $  startMonth = isset($  startMonthDay[0]) ? (int)$  startMonthDay[0] : 1;             $  startDay = isset($  startMonthDay[1]) ? (int)$  startMonthDay[1] : 1;             $  dateStart->setDate($  dateStart->format('Y'), $  startMonth, $  startDay);             if ($  range == '2y') {                 $  dateStart->modify('-1 year');             }             break;     }      if ($  returnObjects) {         return [$  dateStart, $  dateEnd];     } else {         return ['from' => $  dateStart, 'to' => $  dateEnd, 'datetime' => true];     } }