PHP date formatting and date calculation and getting the current week, first and last date of the month_PHP tutorial

PHP date formatting and date calculation and getting the current week, first and last date of the month

PHP date formatting and date calculation and when getting the previous week, first and last date of the month

PHP date formatting sample code:

   /**
     * 格式化时间
     * $type:类型
     * $strDate：需要处理的时间字符串
     *
     * 年份  Y：四位年份     y：两位年份
     * 月份  m: 两位数字月份 n: 一位数字月份 M：英文月
     * 日期  d：两位数字日期 j:一位数字日期  D:英文日期
     * 时：H 、分:i 、秒：s
     **/
    public function GetFormatDate($type = 1,$strDate=''){
            $time = time();
            if(isset($strDate) && !empty($strDate)){
                $time = strtotime($strDate);
            }

            switch($type){
                case 1:
                   return date("H:i",$time);
                case 2:
                    return date("m月d日 H:i",$time);
                case 3:
                    return date("m/d H:i",$time);
                case 4:
                    return date("Y年m月d日 H:i",$time);
                case 5:
                    return date("Y/m/d H:i",$time);
                case 6:
                    return date("Y年m月d日 H:i:s",$time);
                case 7:
                    return date("Y-m-d H:i:s",$time);
                case 8:
                    return date("Y/m/d H:i:s",$time);
                default:
                    return $strDate;
            }
    }

Date calculation sample code:

   /**
     * 时间加减处理
     * $strDate：需要处理的时间字符串
     * $days：   加减天数
     **/
    public function ChangeDate($strDate,$days){
          $time = time();
          if(isset($strDate) && !empty($strDate)){
              $time = strtotime($strDate);
          }

         return date('Y-m-d H:i:s',strtotime("$days day",$time));
    }

Sample code to get the first and last date of the current week and month:

   /**
     *  获取当前周、月的头尾日期
     *
     *  $dateArr['W1']:周一
     *  $dateArr['W7']:周末
     *  $dateArr['M1']:月头
     *  $dateArr['M2']:月尾
     **/
    public function GetCurrentDateInfo(){
       $dayTimes = 24*60*60;
       $dateArr = [];$temp = '';

       $weekIndex = (int)date('w');
       switch($weekIndex){
            case 0:
                $dateArr['W1'] = date('Y-m-d 00:00:00',strtotime('+1 day'));
                $dateArr['W7'] = date('Y-m-d 23:59:59',strtotime('+7 day'));
                break;
            case 1:
                $dateArr['W1'] = date('Y-m-d 00:00:00');
                $dateArr['W7'] = date('Y-m-d 23:59:59',strtotime('+6 day'));
                break;
            case 2:
                $dateArr['W1'] = date('Y-m-d 00:00:00',strtotime('-1 day'));
                $dateArr['W7'] = date('Y-m-d 23:59:59',strtotime('+5 day'));
                break;
            case 3:
                $dateArr['W1'] = date('Y-m-d 00:00:00',strtotime('-2 day'));
                $dateArr['W7'] = date('Y-m-d 23:59:59',strtotime('+4 day'));
                break;
            case 4:
                $dateArr['W1'] = date('Y-m-d 00:00:00',strtotime('-3 day'));
                $dateArr['W7'] = date('Y-m-d 23:59:59',strtotime('+3 day'));
                break;
            case 5:
                $dateArr['W1'] = date('Y-m-d 00:00:00',strtotime('-4 day'));
                $dateArr['W7'] = date('Y-m-d 23:59:59',strtotime('+2 day'));
                break;
            case 6:
                $dateArr['W1'] = date('Y-m-d 00:00:00',strtotime('-5 day'));
                $dateArr['W7'] = date('Y-m-d 23:59:59',strtotime('+1 day'));
                break;
        }


       //1-12：一月 至 十二月
       $monthIndex = (int)date('m');
       switch($monthIndex){
           case 1:
               $temp = date('Y-02-01 00:00:00');
               $dateArr['M1'] = date('Y-m-01 00:00:00');
               $dateArr['M2'] = date('Y-m-d 23:59:59',strtotime($temp)-$dayTimes);
               break;
           case 2:
               $temp = date('Y-03-01 00:00:00');
               $dateArr['M1'] = date('Y-m-01 00:00:00');
               $dateArr['M2'] = date('Y-m-d 23:59:59',strtotime($temp)-$dayTimes);
               break;
           case 3:
               $temp = date('Y-04-01 00:00:00');
               $dateArr['M1'] = date('Y-m-01 00:00:00');
               $dateArr['M2'] = date('Y-m-d 23:59:59',strtotime($temp)-$dayTimes);
               break;
           case 4:
               $temp = date('Y-05-01 00:00:00');
               $dateArr['M1'] = date('Y-m-01 00:00:00');
               $dateArr['M2'] = date('Y-m-d 23:59:59',strtotime($temp)-$dayTimes);
               break;
           case 5:
               $temp = date('Y-06-01 00:00:00');
               $dateArr['M1'] = date('Y-m-01 00:00:00');
               $dateArr['M2'] = date('Y-m-d 23:59:59',strtotime($temp)-$dayTimes);
               break;
           case 6:
               $temp = date('Y-07-01 00:00:00');
               $dateArr['M1'] = date('Y-m-01 00:00:00');
               $dateArr['M2'] = date('Y-m-d 23:59:59',strtotime($temp)-$dayTimes);
               break;
           case 7:
               $temp = date('Y-08-01 00:00:00');
               $dateArr['M1'] = date('Y-m-01 00:00:00');
               $dateArr['M2'] = date('Y-m-d 23:59:59',strtotime($temp)-$dayTimes);
               break;
           case 8:
               $temp = date('Y-09-01 00:00:00');
               $dateArr['M1'] = date('Y-m-01 00:00:00');
               $dateArr['M2'] = date('Y-m-d 23:59:59',strtotime($temp)-$dayTimes);
               break;
           case 9:
               $temp = date('Y-10-01 00:00:00');
               $dateArr['M1'] = date('Y-m-01 00:00:00');
               $dateArr['M2'] = date('Y-m-d 23:59:59',strtotime($temp)-$dayTimes);
               break;
           case 10:
               $temp = date('Y-11-01 00:00:00');
               $dateArr['M1'] = date('Y-m-01 00:00:00');
               $dateArr['M2'] = date('Y-m-d 23:59:59',strtotime($temp)-$dayTimes);
               break;
           case 11:
               $temp = date('Y-12-01 00:00:00');
               $dateArr['M1'] = date('Y-m-01 00:00:00');
               $dateArr['M2'] = date('Y-m-d 23:59:59',strtotime($temp)-$dayTimes);
               break;
           case 12:
               $temp = date((date('Y')+1)."-01-01 00:00:00");
               $dateArr['M1'] = date('Y-m-01 00:00:00');
               $dateArr['M2'] = date('Y-m-d 23:59:59',strtotime($temp)-$dayTimes);
               break;
       }


       return $dateArr;
    }

The above code is for reference only, please point out any omissions for improvement!

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