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Private browser tool

Unix Timestamp Converter

Convert Unix timestamps to UTC dates or dates to Unix seconds online. Inspect epoch values privately in your browser with no account required.

✓ Local processing✓ No uploads✓ No account
  1. 1Add input
  2. 2Choose options
  3. 3Get result

Private on this device

Filemivo uses browser APIs to process your input on this device. File contents, filenames and metadata are not sent to our server or analytics.

Next step

Continue working with your file

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JSON→

Format JSON

Pretty-print or minify JSON in your browser.

Simple by design

From file to result in three steps

  1. 1

    Choose Timestamp to date or Date to timestamp.

  2. 2

    Enter the timestamp or an ISO date with timezone.

  3. 3

    Run Unix timestamp and inspect the result.

Practical guidance

When to use Unix timestamp

Best for

Reading epoch values from logs or creating a Unix timestamp from a date with an explicit timezone.

What you get

An ISO date in UTC, or whole Unix seconds for the date you supply.

Useful tip

Include Z or a timezone offset in date input. Current millisecond timestamps are recognized by their magnitude.

Example: the Unix epoch

Unix time counts from 1 January 1970 at midnight UTC. Using a timezone in date input avoids ambiguity when your browser runs in a different local timezone.

Timestamp: 0
UTC date: 1970-01-01T00:00:00.000Z

Date input: 1970-01-01T00:00:00Z
Unix seconds: 0
Inspect log values locally →

Good to know

Frequently asked questions

What timezone is the date result in?+

Timestamp-to-date output is UTC, indicated by the Z at the end of the ISO date.

How does the converter choose seconds or milliseconds?+

Numeric values below 1,000,000,000,000 are treated as seconds; larger values are treated as milliseconds. Earlier millisecond timestamps and negative millisecond values must be converted to seconds first.

Does my file leave my device?+

No. This tool processes your file inside your browser and does not send its contents, name or metadata to Filemivo.

Is Unix timestamp free?+

Yes. It is free to use and has no artificial file-size limit. Your browser and device memory determine the practical limit.