Date Archive Page showing 404 Error

Hi, My site’s date archive page is showing 404 error. Here the link to my site https://thedripple.com

Here’s the link to October’s archive – https://thedripple.com/date/2012/10/

Can anybod help me with this..I am seeing ths problem from 2-3 days only. I’ve tried updating Permalink structure but its still the same.