How to trigger email by comparing date value in node?
Hi You can add a filed in your content type like date_content_type .
a)chose filed type =date  in content type(admin/structure/types/manage/content_type/fields)

b)add a condition in Rule set 
c) select condition= data comparison
d) click on continue button
e) select data selector set your custom date type field 
f)then add your time() value and save it . now your date condition rule set will be execute 
i hope it will help you 
Thanks