bts/php/app/command/Hello.php

<?php
declare (strict_types = 1);

namespace app\command;

use think\console\Command;
use think\console\Input;
use think\console\input\Argument;
use think\console\input\Option;
use think\console\Output;

class Hello extends Command
{
    protected function configure()
    {
        // 指令配置
        $this->setName('hello')
            ->setDescription('the hello command');        
    }

    protected function execute(Input $input, Output $output)
    {

//        var_dump($input);
//        var_dump($output);

        $result=date("Y-m-d", strtotime("-1 month", strtotime("2017-03-31")));
    	// 指令输出
    	$output->writeln($result);
    }
}