⌛ Unix Timestamp Converter
Convert Unix epoch time to human-readable dates and back — seconds or milliseconds, any timezone, with live current timestamp. Free, instant.
📚 About This Converter
A Unix timestamp is the number of seconds since 00:00:00 UTC on January 1, 1970, with no timezone attached. This tool converts a timestamp to a human-readable date (or the reverse) instantly, in either seconds or milliseconds, with the exact code snippet for common languages. For the underlying concept, its history, and how it's computed, see What Is Unix Time?.
⚙️ Seconds vs Milliseconds
| Format | Example (same moment) | Common In |
|---|---|---|
| Seconds (Unix standard) | 1751328000 | Most Unix/Linux systems, PHP, Python, most APIs |
| Milliseconds | 1751328000000 | JavaScript Date.now(), Java System.currentTimeMillis() |
This is the single most common conversion error: pasting a millisecond value into a seconds field computes a date roughly 44,000 years in the future, and the reverse lands in 1970. If your converted date looks wildly wrong, check the unit toggle above first.
⚠️ Reading Very Large or Negative Results
Very large timestamps (post-2038): systems still storing time as a signed 32-bit integer overflow at 03:14:07 UTC on January 19, 2038. If a date this converter shows looks like it wrapped to 1901 rather than the future date you expected, that's the classic symptom — this converter itself uses 64-bit math and isn't affected.
Negative timestamps: valid for dates before the 1970 epoch. Not every library handles negative Unix time correctly, so test explicitly if your application needs pre-1970 dates.
Timezone display: the timestamp itself has no timezone — the human-readable value shown here uses your browser's local timezone by default. If you're comparing against a server log or another system, confirm both sides use the same timezone before assuming a discrepancy is a bug.
💻 Converting Timestamps in Code
| Language | Timestamp → Date |
|---|---|
| JavaScript | new Date(timestamp * 1000) |
| Python | datetime.fromtimestamp(timestamp) |
| PHP | date('Y-m-d H:i:s', $timestamp) |
| SQL (MySQL) | FROM_UNIXTIME(timestamp) |
📄 Timestamp Formats You'll Encounter
Unix time is only one of several date formats you'll run into. Knowing how to recognize each on sight saves a lookup:
| Format | Example (same moment) | Where You'll See It |
|---|---|---|
| Unix (seconds) | 1751328000 | APIs, Unix/Linux systems, most databases |
| Unix (milliseconds) | 1751328000000 | JavaScript, Java, browser APIs |
| ISO 8601 | 2025-06-30T20:00:00Z | REST APIs, JSON payloads, log files — the most common human-readable interchange format |
| RFC 2822 | Mon, 30 Jun 2025 20:00:00 +0000 | Email headers (Date: field), some legacy HTTP headers |
The trailing Z in ISO 8601 means UTC (zero offset) — if you see a value like +05:30 instead, that's the offset from UTC, not a separate timezone name. This converter accepts and outputs Unix time only; for ISO 8601 or RFC 2822 strings, most languages parse them natively (JavaScript's new Date(isoString), Python's datetime.fromisoformat()) without needing the epoch as an intermediate step.
🛠️ Use Cases
🔗 More Developer Tools
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