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echo Carbon::now()->addDays(4); //2015-09-04 20:39:45
echo Carbon::now()->addWeeks(4); //2015-09-28 20:39:56
echo Carbon::now()->subWeeks(4); //2015-09-28 20:39:56
echo Carbon::now()->tomorrow(); //2015-09-01 00:00:00
echo Carbon::now()->yesterday(); //2015-08-30 00:00:00

$time = Carbon::now()->subYears(1)->timestamp;
echo $time; //1409488994

$date = Carbon::createFromTimestamp($time);
echo $date; //2014-08-31 20:43:58
echo $date->diffForHumans(); //1 year ago

$date = Carbon::now()->addDays(4)->addMinutes(25);
echo $date->diffForHumans(); //4 days from now

$date = Carbon::now();
echo $date->startOfMonth(); //2015-08-01 00:00:00
echo $date->endOfMonth(); //2015-08-31 23:59:59
echo $date->toDateString(); //2015-08-31
echo $date->toFormattedDateString(); //Aug 31, 2015
echo $date->toATOMString(); // 2015-08-31T23:59:59+08:00

echo new Carbon('next day'); //2015-09-01 20:53:18
echo new Carbon('last Friday'); //2015-08-28 00:00:00
echo new Carbon('this Saturday'); //2015-09-05 00:00:00

$date = new Carbon('this Saturday');
echo $date->dayOfWeek; //6
echo $date->month; //9