Timestamp Converter

100% free · Runs 100% in your browser · No signup needed

Unix timestamp → human-readable date

Converted date will appear here...

Date & time → Unix timestamp

Unix timestamp will appear here...

About Timestamp Converter

Timestamp Converter - Free Online Tool

The Timestamp Converter translates between Unix timestamps (seconds since January 1, 1970) and human-readable dates in both directions. Timestamps like 1727740800 are how computers store time - in databases, logs, APIs and JWT tokens - but they mean nothing to human eyes. This tool converts them instantly and also turns any date back into a timestamp.

How to use: 1) Paste a Unix timestamp and click Convert to see it as a UTC date, your local date, an ISO 8601 string and a relative time like 3 days ago. 2) Or pick a date and time in the second converter and click Convert to get the Unix timestamp in seconds and milliseconds. 3) The Use current time button fills both converters with right now.

Why use it: Debugging is where this tool earns its keep - a log says an event happened at 1727740800, was that yesterday or last month? An API returns an expiry timestamp, has the token already expired? Converting by hand requires mental math nobody wants to do. The relative-time readout answers when was that at a glance, and the UTC/local split eliminates timezone confusion.

Key benefits: True two-way conversion - timestamps to dates and dates to timestamps. Shows UTC, local time, ISO 8601 and relative time in one view. Smart input handling accepts both seconds and milliseconds automatically. Relative phrases like in 2 hours make log forensics fast. Everything runs locally in your browser with no server round-trip and no signup.

FAQs: Seconds or milliseconds? Both work - the tool detects milliseconds (13 digits) automatically. What timezone is local? Your browser timezone - the UTC line is the unambiguous reference. What is the 2038 problem? 32-bit timestamps overflow in January 2038; this tool uses 64-bit math so it handles far-future dates fine. Can I convert 3 days ago text? Not yet - pick the date in the date picker instead.

Pro tips: When correlating logs from servers in different timezones, always compare using the UTC line - local times will mislead you. The relative time readout is perfect for answering "did this happen before or after the deploy?" at a glance. For JWT debugging, paste the exp claim here to see the expiry as a real date. FistHost pairs this converter with its free JWT decoder for complete token forensics.

Related tools: The JWT Decoder shows token expiry claims you can paste here for human-readable dates, and the Cron Generator helps schedule jobs around those times. All FistHost time utilities work entirely in your browser.

How to Use Timestamp Converter: Step by Step

Paste a Unix timestamp (seconds or milliseconds) to convert it to a human-readable date, or enter a date to convert it to a timestamp.
Select the correct unit — seconds vs. milliseconds is the most common source of wrong results.
Optionally pick a timezone for the human-readable output.
Click Convert and read both representations.
Copy the value you need into your code, logs, or database query.

Pro Tips

If your date lands in 1970 or the year 50,000, you’ve mixed up seconds and milliseconds — toggle the unit and try again.
Remember Unix timestamps are UTC; convert to local time explicitly when displaying to users.
For APIs, prefer sending timestamps over formatted date strings — they’re unambiguous across timezones.

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