If you are hosting with cPanel and had a domain removed and would like to find out when, you can check in the cPanel access logs like this:
~]#grep cpaneluser /usr/local/cpanel/logs/access_log |grep domain|grep dodeldomainconfirm
Also, using the same method, you can find out when a subdomain was deleted
~]#grep cpaneluser /usr/local/cpanel/logs/access_log |grep subdomain|grep dodeldomainconfirm
Be sure to replace cpanel user with the cpanel username that owned the domain and domain or subdomain with the actual domain or subdomain that you are looking for.