Unix Timestamp Converter —
Epoch to Date & Time
Convert Unix timestamps to human-readable dates instantly. Supports seconds, milliseconds, and microseconds with 25+ timezone conversions. Free, private, and used by 50,000+ developers worldwide.
⚡ Quick Answer
A Unix timestamp is the number of seconds elapsed since January 1, 1970 00:00:00 UTC (the Unix epoch). To convert: divide by 1,000 if in milliseconds, then use new Date(seconds * 1000) in JavaScript or date -d @TIMESTAMP in Unix/Linux.
Timestamp Converter
How to Convert a Unix Timestamp
// 4 steps · 30 seconds
Enter Your Timestamp
Paste a numeric value. We auto-detect seconds, milliseconds, or microseconds when format is set to Auto.
Select Timezone
Choose UTC, EST, PST, CST, GMT, CET, IST, JST, or AEST. DST is applied using the IANA database for that zone.
Click Convert
We compute ISO 8601, RFC 822, human-readable strings, milliseconds, and Unix seconds together.
Copy Any Format
Use the copy buttons beside each result row. Confirmation shows a checkmark for 1.5 seconds.
Unix Timestamp Output Formats
| Format | Example output | Standard | Used by |
|---|---|---|---|
| ISO 8601 | 2023-11-14T22:13:20.000Z | ISO 8601 / RFC 3339 | REST APIs, JSON, PostgreSQL |
| RFC 822 | Tue, 14 Nov 2023 22:13:20 GMT | RFC 822 / RFC 2822 | HTTP Date, email headers |
| Human readable | Tuesday, November 14, 2023… | Locale + IANA TZ | UI, logging, support tools |
| Unix seconds | 1700000000 | POSIX time | Linux, Redis, JWT exp |
| Milliseconds | 1700000000000 | JavaScript Date | Browsers, Node.js, Kafka |
Written & Reviewed by Unix Calculator Editorial Team
Senior Unix/Linux Engineers & Developer Tooling Specialists
We verify behavior against POSIX time semantics, document leap-second caveats where libraries diverge, and test DST boundaries across IANA zones. Pre-epoch and sub-second inputs are validated against reference `date` implementations and RFC 3339 profiles used in production APIs.
Last updated: April 2026 · Editorial methodology
Frequently Asked Questions
A Unix timestamp counts seconds since the Unix epoch: January 1, 1970 00:00:00 UTC. It is timezone-agnostic at storage time; local display depends on your timezone.
Systems often store epoch seconds (10 digits) or milliseconds (13 digits). Our converter auto-detects common scales.
// Epoch start (UTC) new Date(0).toISOString() // 1970-01-01T00:00:00.000Z
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