Hello,

First I want to thanx Beat for his help on my question, it was great from him to set this part. So I put some explainations here with snapshot, if it can help someone who have the same problem

So you understand my problem was that I want to set different price for subscriptions as I wrote above :

- for first subscription, in proportion to the staying month number before 31/3/2013:

Subscription between 1/4/2012 and 30/4/2012 for 12 months : 120 €
Subscription between 1/5/2012 and 31/5/2012 for 11 months : 110 €
Subscription between 1/6/2012 and 30/6/2012 for 10 months : 100 €
Subscription between 1/7/2012 and 31/7/2012 for 9 months : 90 €
Subscription between 1/8/2012 and 31/8/2012 for 8 months : 80 €
Subscription between 1/9/2012 and 30/9/2012 for 7 months : 70 €
Subscription between 1/10/2012 and 31/10/2012 for 6 months : 60 €
Subscription between 1/11/2012 and 30/11/2012 for 5 months : 50 €
Subscription between 1/12/2012 and 31/12/2012 for 4 months : 40 €
Subscription between 1/1/2013 and 31/1/2013 for 15 months (adhésion jusqu’au 31/03/2014) : 150 €
Subscription between 1/2/2013 and 28/2/2013 for 14 months (adhésion jusqu’au 31/03/2014) : 140 €
Subscription between 1/3/2013 and 31/3/2013 for 13 months (adhésion jusqu’au 31/03/2014) : 130 €
Subscription between 1/4/2013 and 30/4/2013 for 12 months : 120 €

So first I set my plan

and now the aim is first to set promotion plugin to reduct for 1/12 of price each month after april to december :

Note that discount rate is set to 100%. The next snapshot will show the timing for this promotion

So here is the result on front page :



The second part is a bit more heavy because if I want to set three diffrent price for January to March I have to set three disctincts promotions.

Here is the first one, you'll understand the nexte one with this example. First the basic promotion settings :

You surely note that the discount rate in percent is set to -25%. It's because I want that my subscribers will pay un january for 15 months so they have to pay 150 euros equal to 120 euros (one year) + (3*1/12)*120 euros and 3*1/12 = 0.25 You wil understand now why the timing is "on full price"

Instead of the first example for this one we'll have to set conditions like that :

I hope that this snapshot will show how you can set Regex rules, it was new for me and it's really a strong tool !

Now if you have understand the last setting, the following snapshots will be easy to understand

2*1/12= 0.166667