Renewing donation?

If I renew my donation for another year early ( 8 days) will it roll over on the anniversary date of my last donation or take effect immediately forfeiting the left over 8 days?

Thanks for any info

For anyone interested the answer is Yes your left over days are added to your new 12 months if you renew your donation early.

/source: just renewed for another 12 months and left over days were added.