Timestamp Converter

Free online Unix Timestamp Converter. Convert seconds, milliseconds, microseconds, and nanoseconds epoch timestamps to UTC, local time, ISO 8601, and relative dates with IANA timezones and batch export.

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How to Use Timestamp Converter

  1. Inspect the live Unix Epoch clock with ticking seconds, milliseconds, microseconds, and nanoseconds.
  2. Enter an Epoch integer (10-digit seconds, 13-digit milliseconds, 16-digit microseconds, or 19-digit nanoseconds) to view automatic unit detection, local time, UTC, ISO 8601, and calendar statistics.
  3. Use the Date-to-Epoch tab with our interactive calendar picker and IANA timezone selector to translate any local or global datetime into exact Unix timestamps.
  4. Switch to the Batch Converter tab to convert dozens of timestamps simultaneously and export results to CSV or TXT.
  5. Use the Time Diff calculator to determine the exact elapsed duration between two timestamps in days, hours, and seconds.
  6. Browse the Developer Code Snippets tab for instant copyable code across JavaScript, Python, Go, PHP, Java, Rust, SQL, and Bash.

Epoch Timestamp Conversion Cheat Sheet

| Unit | Digit Count | Example Timestamp | Formula in JS / Python | | :--- | :--- | :--- | :--- | | **Seconds (Unix)** | 10 digits | `1725250000` | `Math.floor(Date.now() / 1000)` / `int(time.time())` | | **Milliseconds** | 13 digits | `1725250000000` | `Date.now()` / `int(time.time() * 1000)` | | **Microseconds** | 16 digits | `1725250000000000` | `int(time.time() * 1e6)` | | **Nanoseconds** | 19 digits | `1725250000000000000` | `time.time_ns()` in Python |

Understanding ISO 8601 & RFC 3339 Standards

ISO 8601 standardizes date and time notation in the format `YYYY-MM-DDTHH:mm:ss.sssZ`, where `T` separates the calendar date from time and `Z` denotes zero UTC offset (Zulu time). RFC 3339 is an internet profile of ISO 8601 widely mandated across REST APIs, JSON schemas, Kubernetes events, and database audit logs.

Frequently Asked Questions

What is Unix Epoch time?
Unix Epoch time is the total number of seconds that have elapsed since 00:00:00 UTC on 1 January 1970 (the Unix epoch), excluding leap seconds.
How does automatic granularity detection work?
Our converter inspects digit length automatically: 10-11 digits are treated as seconds, 12-14 digits as milliseconds (standard in JavaScript Date.now()), 15-17 digits as microseconds, and 18-19 digits as nanoseconds (standard in Python time_ns() and Go).
What will happen during the Year 2038 problem (Y2K38)?
On January 19, 2038 at 03:14:07 UTC, legacy 32-bit signed integers will overflow at 2,147,483,647 seconds and wrap around to negative numbers (December 13, 1901). Modern 64-bit systems represent timestamps up to approximately 292 billion years into the future, preventing this overflow.
How do I handle timezones when converting Epoch timestamps?
Unix Epoch timestamps are universally absolute in UTC. When displaying human-readable dates, the timestamp is projected into your local browser timezone or any chosen IANA timezone (such as IST, EST, PST, CET, or JST) using standard UTC offsets.
Are my timestamps or date queries sent to any external server?
No. All calculations run 100% client-side inside your browser memory using native JavaScript Date and Intl APIs. No data or telemetry ever leaves your computer.