Epoch Clock
Watch the Unix timestamp tick in real time.
Live Timestamp
Milestones
The epoch clock displays the current Unix timestamp updating live every second. The seconds count, the millisecond version, the hex representation, the local time, and the UTC time all update together, so you can read the same instant in five different formats at once. Below the live clock is a list of notable Unix epoch milestones from January 1, 1970 to the 2038 overflow.
What the Live Clock Shows
The hero number at the top is the current Unix timestamp in seconds - the number of seconds that have elapsed since January 1, 1970 at 00:00:00 UTC, ignoring leap seconds. It ticks once per second, matching what a server-side date +%s call would return at the same moment. Below it, four supporting rows show the same instant in different formats:
- Milliseconds: the 13-digit version (Unix timestamp times 1000), matching JavaScript's Date.now() and most modern API responses.
- Hex: the same timestamp written in base-16. Useful for inspecting binary log files or comparing against database storage formats.
- Local Time: the readable date in your browser's local timezone, so the clock matches what your operating system shows.
- UTC Time: the same moment expressed in Coordinated Universal Time, which is timezone-independent and used by virtually all servers.
Click any row to copy the current value to your clipboard. The Hex row is especially useful for tracing timestamps in hex-dump output or for understanding what byte sequence corresponds to a given moment. To convert a specific timestamp instead of watching the current one, use the main timestamp converter. For converting many timestamps at once, the batch converter handles entire lists.
The Epoch Milestones
The milestones section lists Unix timestamps that mark notable points in computing history. Each row shows the timestamp value, the calendar date it represents, and a relative description (how long ago or how far in the future). The milestones include:
- The Epoch (0): January 1, 1970, 00:00:00 UTC. The reference point all Unix timestamps count from. Chosen arbitrarily by Bell Labs engineers designing early Unix systems and now the de facto standard for time storage in computing.
- One Billion (1,000,000,000): September 9, 2001. The first time the Unix timestamp ever reached a 10-digit number. Celebrated by Unix sysadmins and became a recurring meme.
- Ascending Digits (1,234,567,890): February 13, 2009. The Unix timestamp with all 10 digits in ascending order. Triggered another wave of celebration parties among programmers.
- 1.5 Billion (1,500,000,000): July 14, 2017. The half-billion mark between 1B and 2B.
- Two Billion (2,000,000,000): May 18, 2033. The next big round number, less than a decade away.
- 32-bit Overflow / Y2038 (2,147,483,647): January 19, 2038 at 03:14:07 UTC. The moment 32-bit signed Unix timestamps run out of room and wrap to a negative number. The Year 2038 tool covers this in depth with a live countdown.
Why Unix Time Counts Up Forever
Unix time is a single integer that counts seconds since the epoch. It does not store timezones, daylight saving offsets, or calendar information - just the raw second count. To convert it to a human-readable date you apply calendar rules at display time. This makes the format extremely simple to store (4 or 8 bytes), trivial to compare (one integer vs another), and unambiguous across timezones (the same number means the same moment everywhere on Earth).
The trade-off is the Y2038 problem: 32-bit signed integers can only hold values up to 2,147,483,647, which corresponds to January 19, 2038. Beyond that, the value wraps around to a large negative number, which most software will interpret as a date in 1901. Modern systems use 64-bit signed timestamps that can store dates up to the year 292 billion or so, which removes the immediate concern.
When to Use the Live Clock
The epoch clock is a handy reference during development and debugging. Common uses:
- Quick "right now" timestamp: copy the current Unix timestamp to paste into a database insert, a test fixture, or an API request without running
date +%sin a terminal. - Sanity-check log timestamps: if a log line shows 1700000000, compare it against the live clock to confirm you are looking at recent data and not last year's snapshot.
- Match server time: compare the clock to a server's date command output to verify clocks are in sync.
- Demos and teaching: show a class or a screencast viewer what Unix time looks like ticking forward in real time, especially when explaining how computers store time.
To shift the current timestamp forward or backward by a known duration, use the date add/subtract calculator. For the difference between two arbitrary moments, the date difference calculator does the math.
Frequently Asked Questions
The Unix epoch is January 1, 1970 at 00:00:00 UTC. It is the zero point that Unix timestamps count from: every Unix timestamp is the number of seconds that have elapsed since that moment. The date was chosen arbitrarily by Bell Labs engineers designing early Unix systems and has been the de facto standard for time storage in computing ever since.
Unix time has one-second resolution by default, so the seconds count only changes once per second. The clock recomputes every second to match. The Milliseconds row also updates once per second on this page (not every millisecond) to keep the display readable; in code you would call Date.now() to get true millisecond precision.
Unix time and UTC are conceptually different but practically interchangeable for most uses. UTC is the timezone reference. Unix time is a count of seconds since the UTC epoch, ignoring leap seconds. The difference matters only during the leap-second events themselves (about once every few years), where Unix time and UTC are briefly out of sync by one second.
The clock reads your local machine's time, which may drift by a fraction of a second relative to a server unless your OS is running NTP synchronization. Differences under one second are normal. Larger drifts mean your local clock is out of sync; check that NTP (timesyncd, chronyd, or Windows Time Service) is running and reaching its time source.
Seconds give a 10-digit timestamp like 1700000000 and are the format used by most server languages, databases, and the Unix date command. Milliseconds give a 13-digit timestamp like 1700000000000 and are the format JavaScript's Date.now() returns. Multiply seconds by 1000 to get milliseconds, or divide milliseconds by 1000 to get seconds (truncating the remainder).
On January 19, 2038 at 03:14:07 UTC, a 32-bit signed Unix timestamp reaches its maximum value (2,147,483,647). The next second causes it to overflow into a large negative number, which most software interprets as a date in 1901. Modern 64-bit systems are not affected, but embedded devices and legacy software may still use 32-bit timestamps. The Year 2038 tool covers this in detail.
Hex is the format Unix timestamps appear in when stored as raw bytes in binary files, network packets, or memory dumps. Looking at a hex dump of a log file is much easier when you can recognize that 4 bytes like 65 4d 5b 38 represent a recent timestamp. The Hex row of the clock makes that translation quick: compare any 4-byte sequence against the current value to gauge how recent it is.
Yes. A negative Unix timestamp represents a date before January 1, 1970. For example -1000000 corresponds to December 20, 1969 at 02:13:20 UTC. Most date libraries accept negative values; the timestamp converter on this site handles them correctly. They are useful for representing historical dates without leaving the Unix time format.
Unix time is accurate to the second by default. Operating systems and modern languages also expose millisecond, microsecond, or nanosecond resolution depending on the platform. Leap seconds are not counted, so during a leap-second event the clock is briefly out of sync with UTC by one second. For almost every application this difference is irrelevant.
Round numbers and palindromes in the timestamp value are popular among Unix admins. 1,000,000,000 (Sep 9, 2001), 1,234,567,890 (Feb 13, 2009), and 1,500,000,000 (Jul 14, 2017) all spawned watch-parties on programming forums. They are cultural inside jokes more than anything, but they also serve as quick mental landmarks for "how long ago" a given timestamp is.