Postmark — LinkedIn Post Time & Engagement Decoder

Postmark reveals the exact timestamp behind LinkedIn's vague "3w" / "2mo" labels — decoded straight from the post's own ID, no API or login required for single lookups. For your own posts, Postmark can also scroll through your activity page and read real reaction and comment counts directly from the page (right there in your own logged-in session), then rank your posting days and times by actual engagement — not just how often you post. Everything runs locally in your browser. Nothing is transmitted anywhere, tracked, or stored outside your own machine.