Carbon 用法

(new carbon('xxxx-xx-xx'))->toDateString()；  //不传参为当前日期  2021-04-13  carbon()内可以为时间戳

(new Carbon('xxxx-xx-xx'))->toDateTimeString()； //不传参为当前日期 2021-04-13 14:13:45

(new Carbon('2021-03-04'))->toDateTimeString()->getTimestamp(); //不传参为当前日期 获取时间戳

(new Carbon('2021-03-04'))->startOfMonth()->format('Y-m-d'); //获取指定时间月初 2021-03-01

(new Carbon('2021-03-04'))->startOfMonth()->getTimestamp(); //获取月初时间戳

(new Carbon())->subMonth()->startOfMonth()->format('Y-m-d'); //当前时间上个月月初时间

(new Carbon())->subDay('3')->format('Y-m-d'); //当前时间前三天

(new Carbon())->addDay('3')->format('Y-m-d')->diffForHumans(); //友好化时间