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Date to Unix Timestamp Converter
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This date to unix timestamp converter takes any calendar date and time you enter and instantly outputs the corresponding Unix epoch value in both seconds and milliseconds. It's a practical utility for developers seeding test data, writing API request payloads that expect epoch time, or scheduling future events by timestamp instead of a date string. Instead of running a quick script or opening a REPL just to do a date to epoch conversion, you can pick a date and time here and get the exact numeric timestamp immediately, including correct handling of your local time zone versus UTC. It's especially useful when you need to hardcode an expiration timestamp, generate a test fixture, or verify that a timestamp your backend produced matches the date you expect. Conversion runs entirely client-side with nothing sent to a server. Pick a date and time below to see its Unix timestamp instantly.
Features
- Converts any date and time to Unix timestamp in seconds
- Also outputs the equivalent millisecond timestamp
- Supports both UTC and local time zone input modes
- Date/time picker plus manual text entry
- Instant recalculation as you adjust the date or time
- Handles historical dates before 1970 as negative timestamps
- Copy-to-clipboard for the generated timestamp
Why use this date to unix timestamp converter?
- Instant results without writing a script or opening a console
- Fully private - dates are converted only in your browser
- Accurate conversion accounting for time zone and DST correctly
- Simple interface for both quick checks and precise engineering use
- Free with no signup or limits
Frequently asked questions
How do I convert a specific date to a Unix timestamp?
Enter the calendar date and time in the input fields, choose UTC or local time zone, and the tool immediately displays the corresponding epoch value.
What's the difference between seconds and milliseconds timestamps?
A seconds timestamp counts whole seconds since 1970-01-01 UTC, while a milliseconds timestamp (used by JavaScript's Date.now()) multiplies that value by 1000 for finer precision.
Does daylight saving time affect the conversion?
Yes, if you select local time zone input, the tool accounts for DST transitions applicable to your browser's configured time zone on that date.
Can I generate a timestamp for a date before 1970?
Yes, dates before the Unix epoch produce a negative timestamp value, which this tool calculates correctly.
Is the output compatible with JavaScript's Date object?
Yes, the millisecond output can be passed directly into new Date(timestamp) in JavaScript.
What timestamp format do most REST APIs expect?
It varies by API, but seconds-based Unix time and ISO 8601 strings are the two most common formats - check your specific API's documentation.
Can I convert future dates, like one year from now?
Yes, you can pick any future date and the tool will calculate its Unix timestamp the same way as any other date.