Recently, a function similar to customer service chat has been implemented.

But I don't know much about the time format that the list needs to be displayed

Therefore, refer to the time display logic of wechat chat list. I implemented a function myself

Specific rules:

• If the time stamp to be formatted (T) > the time stamp in the morning of the same day, "xx:xx in the morning / afternoon" will be displayed
• If t > yesterday morning time stamp, "yesterday" is displayed
• "Week x" if t > this Monday's early morning time stamp
• If t > last Monday's am time stamp, "last week x" is displayed
• If T < the early morning time stamp of last Monday, determine whether the year t is in is the same as the current year
  • Same, display "x month x day"
  • Different, display "mm / DD / yyyy"

Specific code:

　　 /**
     * Format chat list time
     * @param $timestamp int time stamp
     * @return false|string
     */
    public static function formatChatListTime($timestamp){
        $today = strtotime('today');
        $yesterday = strtotime('yesterday');
        // This Monday
        $thisMonday = $today - ((date('w',time()) == 0 ? 7 : date('w',time()))-1)*24*3600;
        // Last Monday
        $lastMonday = $thisMonday - 7*24*3600;

        if ($timestamp > $today){
            $a = date('a', $timestamp);
            $t = date('h:i', $timestamp);
            if ($a == 'am'){
                $a = 'morning ';
            }else{
                $a = 'Afternoon ';
            }
            $result = $a.$t;
        }else if ($timestamp > $yesterday){
            $result = 'Yesterday';
        }else if ($timestamp > $thisMonday){
            $result = self::getWeekDesc($timestamp);
        }else if ($timestamp > $lastMonday){
            $result = 'upper' . self::getWeekDesc($timestamp);
        }else{
            if (date('Y', $timestamp) == date('Y', time())){
                $result = self::dateTimeFormat($timestamp, 'm month d day');
            }else{
                $result = self::dateTimeFormat($timestamp, 'Y year m month d day');
            }
        }
        return $result;
    }

/**
 * Gets the day of the week for the specified time stamp - Chinese description
 * @param int $timeStamp time stamp
 * @return string
 */
public static function getWeekDesc($timeStamp){
    if(intval($timeStamp) == 0){
        return '';
    }
    $week = date('w', $timeStamp);
    switch ($week){
        case 0:
            $desc = 'Sunday';
            break;
        case 1:
            $desc = 'Monday';
            break;
        case 2:
            $desc = 'Tuesday';
            break;
        case 3:
            $desc = 'Wednesday';
            break;
        case 4:
            $desc = 'Thursday';
            break;
        case 5:
            $desc = 'Friday';
            break;
        case 6:
            $desc = 'Saturday';
            break;
        default:
            $desc = '';
            break;
    }
    return $desc;
}