Add a new format {{yy}} for the identifier's invoice group


I want to use an identifier to have the last two digits of the year : “16” instead of "2016"
How can I add this new identifier called for example {{yy}}, and could we imagine to implement it on a future InvoicePlane version ?

[size=10]Last Update: 31.03.2016[/size]

InvoicePlane 2 will get a lot more formatters.

Good news ! :slight_smile:
Maybe a tip to add it by hand on the current version ?
Which file have I to edit ?