Unix Timestamp 0 – What Date Is the Unix Epoch?

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Show the reference instant from which positive and negative Unix timestamps are measured.

Multi-row timestamp converter

Compare timestamps and ISO 8601 dates. Inputs without an offset use UTC.

Row 1Timestamp -> Date
1/1/1970, 12:00:00 AM
ISO: 1970-01-01T00:00:00.000ZSeconds: 0Milliseconds: 0

Unix epoch boundary

What date is Unix timestamp 0?

Unix timestamp zero is the epoch reference: 1970-01-01T00:00:00Z. Positive values count forward from this instant and negative values count backward. This tool is free to use. No account or payment is required.

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What you can do here

  • Unix seconds and milliseconds conversion
  • ISO 8601 parsing
  • Explicit timezone interpretation
  • Fractional and negative Unix timestamps
  • Browser-local processing

Steps

  1. Enter 0 in Timestamp to Date mode.
  2. Check the ISO detail for 1970-01-01T00:00:00.000Z.
  3. Distinguish a real zero timestamp from application-specific null or missing values.

Zero is a valid Unix timestamp

Application code sometimes treats numeric zero as falsy, but in Unix time it represents a precise and valid instant.

Unix epoch example

Timestamp zero is the start of the Unix epoch.

Unix timestamp

0

UTC ISO

1970-01-01T00:00:00.000Z

Common questions

Frequently asked questions

Is timestamp 0 invalid?

No. It is the Unix epoch itself.

What is timestamp -1?

It is one second before the epoch: 1969-12-31T23:59:59Z.

Recommended next steps

Negative Unix TimestampConvert dates before the Unix epoch with negative timestamp values.10-Digit Unix TimestampInterpret common 10-digit Unix values as seconds and confirm the ISO date.Unix Timestamp Converter OnlineConvert Unix seconds, milliseconds, ISO 8601 dates, and timezone-aware values locally.

Debugging a specific Timestamp issue? Browse Timestamp troubleshooting.