Custom Permalink for Archive URL strucutre

I want to have a custom URL structure for Date/Year Archive.

Currently wordpress CMS provides the structure as

http://wordpress.com/2012/04/13/

for the calendar URL structure, but I want to do it as

http://wordpress.com/**archive**/2012/04/13/

only for calender URL structure only but not for single post.

Please guide me how to do it.

Regards,