Create or modify WooCommerce Sequential Order Numbers plugin

Dear Sir or Madam, simple plugin modification :) I have the plugin which is called WooCommerce Sequential Order Numbers (Free 1.4.0 Version) Your job is to modify the plugin (or create new one) so that I can have order numbers like this: #O2015101201 # O YYYY MM DD Number (2 Chars) For example: A customer orders something on 12th October 2015 and is the first one on this day. Then the order got the number #O2015101201. We have the hash sign, then O for Online, then the Year YYYY, then the Month MM, then the Day DD and then the Number of daily order count in 2 digits (first = 01). Now a second customer (or the same) orders on the same day. Then the next number is #O2015101202. If the day is expired and we have the 13th October then the first order of the day will get #O2015101301 as order number. The configuration section in WooCommerce administration can be removed because maybe its not working after your modification and I not need any modification on this order label scheme. If you understand everything you can apply on this for a fair price as you want. Quality is much better than lowest price! I need this in the next 24 hours. If not possible you can have 48 hours, too :) Thanks for your time to read everything.