The question "Add a link to the timeline of a post" was asked in 2012, and the status was initially declined. Since then the timeline feature has evolved and become more useful, and 2015 the status was changed to deferred.
Can we revisit this and get a permanent link to the timeline on every post? It is quite a pain to have to manually change the URL anytime you want to use it. This request seemed to be well received initially, and as Shog9 said in his answer, it has become much more useful since this feature was first proposed. Sha Wiz Dow Ard even proposed a great solution which doesn't add any new text to the posts.