src/Validator/CalendarEventsValidator.php
public function validateDatesArray($attribute, $value, array $parameters, Validator $validator)
    {
        foreach ($value as $date) {
            if (false === strtotime($date) || empty($date)) {
                return false;
            }
        }

        return true;
    }
public function validateDatesArray($attribute, $value, array $parameters, Validator $validator)
    {
        foreach ($value as $date) {
            if (false === strtotime($date) || empty($date)) {
                return false;
            }
        }

        return true;
    }
Validate array of dates

@param string $attribute
@param mixed $value
@param array $parameters
@param Validator $validator

@return bool