How to write the hard pen calligraphy format after one year? 20 13

What you said is the final signature of hard pen calligraphy:

According to the lunar calendar: a book of your company in the early autumn of.

According to Gregorian calendar: September 29th, 20 13. Sometimes it's ok to write 20 13 directly as 20 13, which is the conventional writing (China numbers mixed with Arabic numbers), and that's right.

I hope it helps you.