Customized Order Number plugin for VirtueMart 2 allows you to set up format for your orders numbers...http://cmsmart.net/virtuemart-extensions/customized-order-number-plugin-for-virtuemart-2...

1. Customized Order Number Plugin forVirtuemart 2
Customized Order Number plugin for VirtueMart 2 allows you to set up format for your orders
numbers.
 Our customized order number is an advanced plug-in, which can bring you more
information for your vendors, even your customers can get it when purchasing your
product as well.
This advanced plug-in, especially, you can flexibly change for each order number. You
can create an prefix of an order that doesn’t need to use date format, or select date format.
Even it allows you to set up number of positions with the fixed length of numbers as you
want.
Here, I will give you some examples to know more detail about our customized order
number plug-in for Virtuemart 2. Using this plug-in you can easily customize an order
number to have it like next ones:
• ABC-1, where ABC is a prefix of an order.
In order to get an order format like this set:
o Use Date format - Do notuse it
o Use Prefix - type ABC
o Prefix Separator- selecthyphen
o Number of Positions - set to 0
• ABC-000000001, where ABC is prefix of an order and an order number has fixed
length of numbers.

2. In order to get an order format like this set:
o Use Date format - Do not use it
o Use Prefix - type ABC
o Prefix Separator - select hyphen
o Number of Positions - set to 9
• 04-07/0000001, where 04-07 is a date and a month and order number has fixed length
of numbers.
In order to get an order format like this set:
o Use Date format - select Day-Month/000001
o Use Prefix - empty the field
o Prefix Separator - leave it as is
o Number of Positions - set to 7
• 12-0000000001, where 12 is a month and an order number has fixed length of numbers.
In order to get an order format like this set:
o Use Date format - select Month-000001
o Use Prefix - empty the field
o Prefix Separator - leave it as is
o Number of Positions - set to 10
Now try its demo to get more features what i can say.