Notable Unix timestamps and live date countdowns
Unix time is the number of seconds that have elapsed since midnight UTC on January 1, 1970 — a moment called the Unix epoch. Because it is just one ever-increasing integer, free of time zones and daylight-saving quirks, it has become the way computers everywhere agree on "when." This reference collects the timestamps developers most often look up, alongside live countdowns to the dates people most often ask about.
Every page here is content-rich and client-side: timestamp pages show the exact UTC date, ISO 8601 and RFC 2822 forms, milliseconds, and ready-to-paste conversion code for JavaScript, Python, and Bash, with a relative-time line that recomputes on each visit. Countdown pages tick down live in your own time zone. Nothing is sent to a server.
Notable Unix timestamps
From the epoch itself to the Y2038 limit, these are the round numbers and milestones worth bookmarking. Each links to a full breakdown.
- 0 — The Unix Epoch86400 — One Day After the Epoch1000000 — One Million Seconds1000000000 — One Billion Seconds (Unix Billennium)1111111111 — Repdigit Timestamp 11111111111234567890 — The 1234567890 Timestamp1300000000 — Round Timestamp 1.3 Billion1400000000 — Round Timestamp 1.4 Billion1500000000 — Round Timestamp 1.5 Billion1577836800 — Start of 20201600000000 — Round Timestamp 1.6 Billion1640995200 — Start of 20221672531200 — Start of 20231700000000 — Round Timestamp 1.7 Billion1735689600 — Start of 20251800000000 — Round Timestamp 1.8 Billion1893456000 — Start of 20301900000000 — Round Timestamp 1.9 Billion2000000000 — Two Billion Seconds2145916800 — Start of 2038 (Just Before Y2038)2147483647 — The Y2038 Limit (32-bit Max)
Date countdowns — how many days until…
Live, ticking countdowns to popular recurring dates and a few fixed engineering milestones. Each page also exposes the date's Unix timestamp.
- Days until New YearDays until ChristmasDays until HalloweenDays until Valentine'sDays until ThanksgivingDays until July 4thDays until St. Patrick'sDays until Easter 2027Days until SolsticeDays until April Fools'Days until Pi DayDays until Programmers' DayDays until New Year's EveDays until Leap DayDays until Y2038
Build your own
Need a moment that is not listed? The Epoch & Unix Timestamp Converter turns any timestamp into a date and back, the Countdown Timer counts down to any future instant, and the Date Duration Calculator measures the exact span between any two dates.