Yes, you have to put the date. Always. Everytime. Either in the text – “Joe Blogs wrote something boring in 1998)” or in brackets “Joe Blogs (1998) wrote something boring”, or “Something boring (Joe Blogs, 1998). I would put the page number in the citations at the end but not in the body text as you have it in your example. If the author has writen two things in 1998 you would have Joe Blogs (1998a) and Joe Blogs (1998b). But you always have to put the date.