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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Class DateRangeField Custom DateRangeField which can be used  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package dms  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                class DateRangeField extends FieldGroup  | 
            
                            
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                { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public $minDate, $maxDate;  | 
            
                            
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                    protected $template = "DateRangeField";  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function __construct($name, $minTitle = '', $maxTitle = '', $min = null, $max = null, $minPlaceHolder = null, $maxPlaceHolder = null)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $minDate = new DateField($name.'[min]', $minTitle, $min);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $maxDate = new DateField($name.'[max]', $maxTitle, $max);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $minDate->setConfig("showcalendar", true); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $minDate->setConfig("dateformat", 'yyyy-MM-dd'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($minPlaceHolder) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $minDate->setAttribute('placeholder', $minPlaceHolder); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $minDate->setAttribute('placeholder', "yyyy-mm-dd"); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $maxDate->setconfig("showcalendar", true); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $maxDate->setConfig("dateformat", 'yyyy-MM-dd'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($maxPlaceHolder) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $maxDate->setAttribute('placeholder', $maxPlaceHolder); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $maxDate->setAttribute('placeholder', "yyyy-mm-dd"); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->minDate = $minDate;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->maxDate = $maxDate;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->setName($name);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        Requirements::css(DMS_DIR . '/css/DateRangeField.css');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        parent::__construct($name, new FieldList($this->minDate, $this->maxDate));  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function FieldMin()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->minDate;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function FieldMax()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->maxDate;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function setName($name)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->minDate->setName($name.'[min]');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->maxDate->setName($name.'[max]');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        parent::setName($name);  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function isComposite()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return true;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function setValue($value)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (isset($value['min'])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->minDate->setValue($value['min']);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (isset($value['max'])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->maxDate->setValue($value['max']);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function Field($properties = array())  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        Requirements::css(DMS_DIR . '/css/DateRangeField.css');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return parent::Field($properties);  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.