function gettimestamp($targetTime){
    switch ($targetTime){
        case 'today'://今天
            $timeamp['start'] = strtotime(date('Y-m-d'));
            $timeamp['over'] = strtotime(date('Y-m-d',strtotime('+1 day')));
            break;
        case 'yesterday'://昨天
            $timeamp['start'] = strtotime(date('Y-m-d',strtotime('-1 day')));
            $timeamp['over'] = strtotime(date('Y-m-d'));
            break;
        case 'beforyesterday'://前天
            $timeamp['start'] = strtotime(date('Y-m-d',strtotime('-2 day')));
            $timeamp['over'] = strtotime(date('Y-m-d',strtotime('-1 day')));
            break;
        case 'beforweek'://本周
            $timeamp['start'] = strtotime(date("Y-m-d H:i:s",mktime(0, 0 , 0,date("m"),date("d")-date("w")+1,date("Y"))));
            $timeamp['over'] = strtotime(date("Y-m-d H:i:s",mktime(23,59,59,date("m"),date("d")-date("w")+7,date("Y"))));
            break;
        case 'nowmonth'://本月
            $timeamp['start'] = strtotime(date('Y-m-01'));
            $timeamp['over'] = strtotime(date('Y-m-d',strtotime('+1 day')));
            break;
        case 'permonth'://上月
            $timeamp['start'] = strtotime(date('Y-m-01',strtotime('-1 month')));
            $timeamp['over'] = strtotime(date('Y-m-01'));
            break;
        case 'preweek'://上周 注意我们是从周一开始算
            $timeamp['start'] = strtotime(date('Y-m-d',strtotime('-2 week Monday')));
            $timeamp['over'] = strtotime(date('Y-m-d',strtotime('-1 week Monday +1 day')));
            break;
        case 'nowweek'://本周
            $timeamp['start'] = strtotime(date('Y-m-d',strtotime('-1 week Monday')));
            $timeamp['over'] = strtotime(date('Y-m-d',strtotime('+1 day')));
            break;

        case 'nextday'://明天
            $timeamp['start'] = strtotime(date('Y-m-d'));
            $timeamp['over'] = strtotime(date('Y-m-d'),strtotime('+1 day'));
            break;
        case 'preyear'://去年
            $timeamp['start'] = strtotime(date('Y-01-01',strtotime('-1 year')));
            $timeamp['over'] = strtotime(date('Y-12-31',strtotime('-1 year')));
            break;
        case 'nowyear'://今年
            $timeamp['start'] = strtotime(date('Y-01-01'));
            $timeamp['over'] = strtotime(date('Y-m-d',strtotime('+1 day')));
            break;
        case 'quarter'://季度
            $quarter = ceil((date('m'))/3);
            $timeamp['start'] = mktime(0, 0, 0,$quarter*3-2,1,date('Y'));
            $timeamp['over'] = mktime(0, 0, 0,$quarter*3+1,1,date('Y'));
            break;
        default:
            $timeamp['start'] = strtotime(date('Y-m-d'));
            $timeamp['over'] = strtotime(date('Y-m-d',strtotime('+1 day')));
            break;
    }
    return $timeamp;
}

2.获取某个时间为多久之前

function formatTime($timestamp) {
    $currentTime = time(); // 获取当前时间戳
    $timeDifference = $currentTime - $timestamp; // 计算差值

    if ($timeDifference < 60) {
        return "刚刚";
    } elseif ($timeDifference < 3600) {
        return floor($timeDifference / 60) . "分钟前";
    } elseif ($timeDifference < 86400) {
        return floor($timeDifference / 3600) . "小时前";
    } elseif ($timeDifference < 604800){
        return floor($timeDifference / 86400) . "天前";
    } else{
        return date('Y-m-d',$timestamp);
    }
}

function convertSecondsToTime($seconds) {
    $hours = floor($seconds / 3600); // 计算小时数
    $minutes = floor(($seconds % 3600) / 60); // 计算分钟数
    $remainingSeconds = $seconds % 60; // 计算剩余的秒数
    // 格式化输出
    $hours = str_pad($hours, 2, '0', STR_PAD_LEFT); // 使用前导零填充小时数
    $minutes = str_pad($minutes, 2, '0', STR_PAD_LEFT); // 使用前导零填充分钟数
    $remainingSeconds = str_pad($remainingSeconds, 2, '0', STR_PAD_LEFT); // 使用前导零填充剩余的秒数
    $timeString = $hours . ':' . $minutes . ':' . $remainingSeconds;
    return $timeString;
}