Unix Timestamp Converter - Multi-Timezone Epoch to Date

Unix timestamp converter online with seconds/millis auto-detect. View ISO 8601, RFC 2822, UTC, and relative time across timezones—local & private. Try now.

Unix (seconds)

1713571200

Unix (milliseconds)

1713571200000

ISO 8601

2024-04-20T00:00:00.000Z

RFC 2822

Sat, 20 Apr 2024 00:00:00 GMT

Relative Time

4/20/2024, 12:00:00 AM

Natural Language

4/20/2024, 12:00:00 AM

Local

4/20/2024, 12:00:00 AM

UTC

Sat, 20 Apr 2024 00:00:00 GMT

UTC

Saturday, April 20, 2024 at 12:00:00 AM

Asia/Shanghai

Saturday, April 20, 2024 at 8:00:00 AM

America/Los_Angeles

Friday, April 19, 2024 at 5:00:00 PM

Europe/London

Saturday, April 20, 2024 at 1:00:00 AM

History

No history yet

How to Use

  1. Choose Timestamp → Date or Date → Timestamp.
  2. Enter a value or pick a date; click Use Now if needed.
  3. Copy the format you need (ISO/RFC/Unix/Relative).
  4. Use the timezone panel to confirm local vs UTC display.

Core Features

  • Convert timestamps to date-time and back in one click.
  • Detect seconds vs milliseconds automatically to prevent unit mistakes.
  • Output ISO 8601, RFC 2822, and Unix seconds/millis formats.
  • Show human-friendly relative time like “2 hours ago” or “in 5 minutes”.
  • Compare the same instant across local, UTC, and custom offsets.
  • Copy results instantly—everything stays local and private.

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Calculation Logic

  • A Unix timestamp represents a UTC instant (timezone-agnostic).
  • Intl.DateTimeFormat renders that instant in different timezones.
  • Relative output is computed from a delta and can be formatted via Intl.RelativeTimeFormat.

FAQ

  • Is it free?
    • Yes.
  • Is my input uploaded?
    • No. Conversions run locally in your browser.
  • How do I get “2 hours ago” style output?
    • Enable relative output and we’ll compute the delta automatically.
  • Why do timestamps look different across timezones? (Technical)
    • The timestamp is a fixed UTC instant; only the display timezone changes. Compare local vs UTC to verify.
  • How do I avoid seconds vs milliseconds confusion?
    • Turn on auto-detect so the tool infers units from length and range.