How to see the exact date of a LinkedIn post: read its link. Every post link carries a long number, the post ID, and the first part of that number is the moment the post was created. Paste the link above and you get that moment to the second, in your own time zone and in UTC. The math runs in your browser and never touches LinkedIn, so it works on a post you cannot open, or one since deleted.
Which links work
The address of an open post, the kind with /posts/ and the author's name in it.
A feed link with an activity, share, or ugcPost ID in it.
A link to a comment, which carries the post's ID and the comment's.
A post ID on its own.
An article under /pulse/ and a profile link never work. Neither is a post, so neither carries a post ID.
Created or published?
For an activity link, the decoded time matched the published time on the post's page in our check. A share or ugcPost ID is written when the post is created, which can be minutes or hours before it went live. Read that time as the earliest the post could have appeared. If the difference matters, find the activity link for the same post.
The method is public: an open-source extractor on GitHub documents it, and LinkedIn's developer documentation on URNs explains the typed IDs in post links. We use the method, not anyone's code.
Check it by hand
You may not want to paste links into anyone's page, ours included. Open your browser's developer console and run this line, with the post ID in quotes:
It prints the creation time in UTC. The ID goes through BigInt because it is longer than an ordinary number can hold exactly. For a list of fifty, the box above is quicker.
Once you know when a post went up, use it. Quoting someone's post back to them only flatters when the post is recent, and a post from last year is background, not a reason to write today.