Unix Timestamp & Epoch Date Converter
Convert Unix epoch timestamps to UTC ISO dates, local time, and relative intervals.
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How to Use the Unix Timestamp Converter: Epoch Seconds to Date & UTC
- 1Type or paste a Unix timestamp (in seconds or milliseconds) into the input box.
- 2Click 'Now' if you want to inspect the current live Unix epoch second.
- 3Read the converted ISO 8601 standard date and your local formatted browser time.
- 4Review relative time elapsed (e.g. '3 days ago' or 'in 5 hours').
Formula & How It Works
POSIX Epoch Time Standard
Calculates elapsed non-leap seconds since January 1, 1970 00:00:00 UTC.
Worked Examples
Converting 1700000000
Input: 1700000000
Explanation: Represents November 14, 2023 at 22:13:20 UTC.
Frequently Asked Questions
What is the Year 2038 Problem (Y2038)?▼
On January 19, 2038, 32-bit signed integers will overflow past 2,147,483,647, wrapping around to negative numbers (-1901) unless migrated to 64-bit.
Do Unix timestamps account for leap seconds?▼
Standard POSIX Unix time repeats the timestamp for leap seconds, meaning every standard day is treated as having exactly 86,400 seconds.
How do you get the current Unix timestamp in JavaScript?▼
Use Math.floor(Date.now() / 1000) for seconds, or Date.now() for milliseconds.
What is the difference between Unix time and UTC?▼
UTC is a civil time standard; Unix time is an integer count of seconds elapsed since the 1970 UTC epoch.
Quick Reference & Conversion Table
| Unix Epoch (Seconds) | Human Date (UTC) | Key Event / Milestone |
|---|---|---|
| 0 | 1970-01-01 00:00:00 | Unix Epoch Beginning |
| 1,000,000,000 | 2001-09-09 01:46:40 | Billion-Second Celebration |
| 1,700,000,000 | 2023-11-14 22:13:20 | Modern Era Milestone |
| 2,147,483,647 | 2038-01-19 03:14:07 | Year 2038 Problem (32-Bit Overflow) |
⚠️ Common Pitfalls to Avoid
- •Mixing up 10-digit second timestamps with 13-digit millisecond timestamps.
- •Forgetting that Unix timestamps are strictly based on UTC 00:00 timezone.
💡 Practical Real-World Uses
- •Debugging database created_at / updated_at timestamps in PostgreSQL and MongoDB.
- •Verifying JSON Web Token (JWT) expiration dates (exp) and issued-at timestamps (iat).
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