Google Reader’s farewell page 404s today, and the Wayback Machine first saw its URL the day after the product died. How PageDate dates a dead link from archived copies.

Paste a URL — even a dead one — and get an honest, evidence-backed publication date. v1.7 dates dead links from their archived copies.

Dating a deleted tweet from its URL alone: the snowflake ID decodes to the millisecond, and the Wayback Machine confirms it one second later.

Robin Good’s TRUST-able newsletter — includes his review of PageDate and the story of how it was built.

The PDF says Mar 24, 2009; history says Oct 31, 2008. Both are right. PageDate reads the evidence and tells you which is which — free, no signup.

24h overlap grid + timezone-native availability polls. DST-aware, shareable links, .ics export. No signup.

GPS, serials, timestamps, hidden data — see it all, download a clean copy with zero quality loss. No signup, nothing uploaded.