Unix Time
Convert Unix time both ways
Type a Unix timestamp, or pick a date, and the board flips to show it in your timezone, in UTC, as ISO 8601 and relative to now. The top row is the current epoch, ticking. Milliseconds are detected automatically when a 13-digit number is pasted.
Unix time counts seconds since 1 January 1970 00:00:00 UTC. It has no timezone of its own, which is why the same number reads as a different clock time on every wall in the world.
What is the year 2038 problem?
32-bit signed timestamps overflow at 2147483647 (19 January 2038). Modern systems use 64-bit counters and are unaffected.
Why does my zone show a different day?
Unix time is UTC. Your local rendering can fall on the previous or next calendar day depending on your offset.
Why a departures board?
Because a split-flap board is the one clock everyone in the hall reads the same way, and every value change is visible as it happens.