Timestamp Generator
Turn a chosen date and time into every common timestamp format at once.
When your code needs a timestamp for a record, a cache key or a test fixture, you rarely want to think in raw epoch math. This generator turns a plain date and time into every format a system might expect - Unix seconds, Unix milliseconds, ISO 8601, RFC 2822, and the human-readable UTC and local strings - all at once.
Pick a moment in the date-time picker, or press Now to grab the current time. Six rows appear, each with a copy button, so you can take exactly the representation your API, database or script expects without retyping numbers.
The whole tool runs locally in your browser. The date you pick is converted with the built-in JavaScript Date API, and nothing is sent anywhere - useful when the timestamp is going into production code and you want to be sure it is exactly right.
178682274017868227400002026-08-15T19:39:00.000ZSat, 15 Aug 2026 19:39:00 GMTSat, 15 Aug 2026 19:39:00 GMT8/15/2026, 7:39:00 PMFeatures
- One picker produces six standard timestamp formats at once.
- Unix seconds and milliseconds side by side for easy comparison.
- ISO 8601, RFC 2822, UTC string and local string renderings.
- Now button to capture the current moment instantly.
- Copy buttons on every row.
- Instant recalculation as you change the date and time.
- Fully offline - nothing leaves your browser.
How to Use
- 1
Pick a moment
Use the date-time picker to choose the date and time, or press Now to use the current moment.
- 2
See all formats
Six rows update automatically: seconds, milliseconds, ISO 8601, RFC 2822, UTC string and local string.
- 3
Copy the one you need
Press the copy button beside the format your system expects - for example milliseconds for a JavaScript consumer.
- 4
Repeat for other moments
Change the picker and the rows recalculate instantly, with no extra clicks.
Example
Future cache expiry
2026-09-01 00:00:00 local↓
Seconds: 1782950400 · ISO: 2026-09-01T00:00:00.000Z · RFC 2822: Tue, 01 Sep 2026 00:00:00 GMTThe current instant
Now↓
Six rows covering seconds, milliseconds, ISO 8601, RFC 2822, UTC and local strings.Common Problems
Milliseconds mistaken for seconds
Both are generated here, and they look similar at a glance. When a consumer rejects a value, check the digit count - a 13-digit number is milliseconds, and the row labels make the distinction explicit.
Ambiguous local time
The picker enters local wall-clock time. During a daylight-saving transition some local moments do not exist or occur twice; the converter resolves them with the platform default behavior.
Assuming ISO means UTC
The ISO 8601 row is emitted in UTC with a Z suffix, which is the safest form for storage. The local string row shows the same instant in your zone so you can see the offset applied.
Timezone drift between machines
A generated seconds value is a fixed instant, but a consumer that renders it in a different zone will print a different wall-clock time. If a test asserts on wall-clock text, pin the zone explicitly.
Cutting and pasting the wrong row
With six similar-looking values, grabbing the wrong one is easy. Each row labels the format, and each has its own copy button so you copy exactly what you are looking at.
Forgetting that months are zero-based elsewhere
The picker shows real month numbers, but code that constructs dates with getMonth() needs a +1. The generated timestamp values themselves are unaffected - the epoch math is correct regardless.
Picking a date the picker cannot express
The datetime-local input requires both a date and a time. If you only care about a date, pick any time - commonly 00:00 - and read the midnight timestamp for that date.
Cache and expiry semantics
A timestamp generated for a cache or a token has whatever lifetime the consuming system assigns. The tool produces the numeric instant; expiry policy lives in your application, not in the value.
Dst ambiguity on the picker
On the spring-forward night, the local hour 02:00 does not exist, and some pickers resolve it by shifting to 03:00. Verify the generated seconds against an expected wall-clock when the moment is near a transition.
Technical Details
The picker produces a local Date; seconds and milliseconds are derived by dividing and flooring the epoch millisecond count.
ISO 8601 output uses toISOString(), which always renders in UTC with a Z suffix, guaranteeing a sortable, unambiguous string.
RFC 2822 output uses toUTCString() with the day and month names spelled out, matching the format email headers and many web APIs expect.
The UTC and local string rows come from toUTCString() and toLocaleString() respectively, so every row represents the identical instant in a different rendering.
datetime-local is parsed in the browser zone, so the same input string yields different epoch values on machines in different zones - the generated numbers are correct for the zone the picker used.
Rows recompute on every change with no network round-trip, so the six formats are always consistent with the currently selected moment.
All conversion is local and synchronous. The date never leaves the page and nothing is stored or logged.
Frequently Asked Questions
Which format should I store in my database?
Unix seconds when you want compact, sortable values, or ISO 8601 when you want the strings to be self-describing. Both are generated here; pick the one your storage layer already speaks.
What is the difference between the UTC and local rows?
They show the same instant. The UTC row renders it in Coordinated Universal Time, the local row in your machine's time zone, with the offset applied so the wall-clock reading differs.
How do I get the current timestamp quickly?
Press Now. The picker snaps to the current local time and every row recalculates to show the current instant in all six formats.
Are milliseconds always 13 digits?
Near the current date, yes - millisecond timestamps are roughly a thousand times larger than second timestamps. The row labels and digit count together make the two easy to tell apart.
Does this tool send my date anywhere?
No. Generation happens entirely in your browser. The selected moment is processed in memory and never transmitted, stored or logged.
Why is my ISO string ending in Z?
The Z marks UTC, the zero-offset zone. ISO 8601 with a Z suffix is the interchange-safe form: it carries the zone with it, so it never depends on the reader's local settings.
Why do the seconds and milliseconds rows differ so much?
Because a millisecond is a thousandth of a second, the milliseconds row is roughly a thousand times the seconds value. That is why the two must never be swapped - the row labels and the digit counts keep them distinct.
Data & Privacy
Your data stays in your browser. Nothing is uploaded.
- Processing
- Local
- Upload
- None
- Server Storage
- None
- Account
- Not required
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