Unix Timestamp Converter & UTC Epoch Calculator
Real-time bidirectional conversion between human dates, Unix timestamps (seconds & ms), and ISO 8601 UTC strings. Fast, zero-dependency, and built for engineers.
Input Date & Time
Input Unix Timestamp
Batch Epoch / Date Inspector
Paste multiple epoch timestamps or date strings (one per line) for instant multi-row parsing.
| Input | Unix (Sec) | UTC ISO String | Local Date / Time |
|---|---|---|---|
| Enter timestamps above to view batch results | |||
How to Get & Convert Unix Epoch in Code
The Year 2038 Problem (Y2038 / Unix Millenium Bug)
On January 19, 2038 at 03:14:07 UTC, the 32-bit signed integer used by legacy systems to store Unix seconds will overflow from 2,147,483,647 to -2,147,483,648 (wrapping around to December 13, 1901). Modern 64-bit systems will not overflow for another 292 billion years.
Epoch Milestone Benchmarks
Understanding Unix Timestamps & UTC Epoch
What is the Unix Epoch?
The Unix epoch is defined as 00:00:00 UTC on January 1, 1970. A Unix timestamp tracks the continuous count of elapsed seconds from that exact moment. Because it is strictly indexed to UTC, epoch time provides an unambiguous standard for recording events across international servers without ambiguous timezone shifts.
- 1 Minute = 60 Seconds
- 1 Hour = 3,600 Seconds
- 1 Day = 86,400 Seconds
- 1 Normal Year (365 days) = 31,536,000 Seconds
Seconds vs Milliseconds vs Microseconds
Different programming ecosystems store timestamps in differing precisions:
Frequently Asked Questions
What is Unix Epoch time and how is it calculated?
Unix Epoch time (also known as POSIX time or Unix timestamp) is the number of seconds that have elapsed since Thursday, 1 January 1970 00:00:00 UTC, excluding leap seconds. It serves as a uniform, timezone-independent baseline across all computing platforms, databases, and network protocols.
What is the difference between 10-digit and 13-digit timestamps?
A 10-digit timestamp represents time in seconds (standard Unix / POSIX format, e.g. 1789549200). A 13-digit timestamp represents time in milliseconds (the standard format returned by JavaScript Date.now() or Java System.currentTimeMillis(), e.g. 1789549200000). Our converter automatically detects whether your input is in seconds, milliseconds, microseconds (16 digits), or nanoseconds (19 digits).
What is the Year 2038 Problem (Y2038)?
The Year 2038 problem occurs on January 19, 2038 at 03:14:07 UTC. On this date, systems storing time as a 32-bit signed integer will exceed the maximum value of 2,147,483,647 and overflow into negative numbers (-2,147,483,648), resetting the clock to December 13, 1901. Modern 64-bit systems represent timestamps with 64-bit integers and will not overflow for roughly 292 billion years.
Does Unix Epoch time adjust for Daylight Saving Time (DST)?
No. Unix Epoch time is strictly measured in UTC (Coordinated Universal Time) and does not have timezones or Daylight Saving Time shifts. When you format an epoch timestamp for a human, the local time offset and DST status of the specific destination timezone are calculated dynamically.
How do I convert an ISO 8601 date string to a Unix timestamp in JavaScript?
In JavaScript / TypeScript, you can parse an ISO 8601 string using Math.floor(new Date("2026-09-16T12:00:00Z").getTime() / 1000) for seconds, or new Date("...").getTime() for milliseconds.
How do I convert a Unix timestamp to human-readable date in Python?
In Python 3.7+, use datetime.fromtimestamp(ts, tz=timezone.utc) to convert epoch seconds into an aware UTC datetime object, or datetime.fromtimestamp(ts) for the system local time.