Membership renewal with a new start date

[vences]

I'm using Drupal 7 with Civicrm. In my membership renewal form, I have a field "Start Date". When member renew 3 months of membership, the expiry date should be 3 months after the "Start Date", rather than 3 months after the last expiration (old member) or 3 months since today (new member).

Is there any way to do it?

[petednz]

Do I understand that you want the user filling in the form to be able the 'start date'?

I don't think this has been done before and I don't think it will be possible without some coding - if you are capable of this then I would ask for guidance on IRC.

If not then if you have some funds you could make enquiries for a developer via https://civicrm.org/providers

[vences]

Yes, I will set a required field "start date" for user to fill in.

Yes, I can do some coding and it is great if you can give me some document or link for guidance. Thank you.

[petednz]

check in on IRC sometime and you may find some helpful pointers but I have no idea how deep this is going to take you :-p