How to run laravel cron after every 2 weeks or 14 days

I need to run laravel cron for after every 2 weeks or 14 days. but not found any solution for this. I was also search on laravel documentation http://ift.tt/2wrgxED and found this option

->weekly();

But it runs on weekly. I was search also other option and found this laravel schedule task to run every 10 days of a month But it work only first 10 days of a month

$schedule->command('log:test')->cron('0 0 1-10 * *');

Please help me if you have any solution thanks in advance.

via Chebli Mohamed