Date to Epoch Converter

A tool that converts any date and time into Unix epoch values in seconds, milliseconds, microseconds, and nanoseconds, along with ISO 8601 and GMT representations.

Yes. Local, UTC, and 17 common IANA timezones. Daylight-saving transitions are handled correctly via the Intl API.

Yes — Bulk tab accepts one date per line in any format (ISO, RFC 2822, "April 15 2026", etc.) and downloads a full CSV.

Yes, the Date to Epoch Converter is 100% free with no registration, no hidden fees, and no usage limits. All processing happens locally in your browser, ensuring complete privacy.

Absolutely. The Date to Epoch Converter processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the Date to Epoch Converter is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the Date to Epoch Converter in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The Date to Epoch Converter works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

A Unix epoch timestamp is a single number that counts how much time has passed since the "epoch" — midnight UTC on 1 January 1970. That reference point was chosen by the early Unix engineers as a convenient, round starting date, and it has been the standard ever since. Because the value is just an elapsed count from a fixed instant, it carries no timezone or formatting of its own, which makes it ideal for storing, sorting, and comparing times across systems and languages. By default the count is in seconds, so a date in 2026 lands near 1.7 billion. Paste or pick any date in this converter and it instantly returns the matching epoch value alongside the human-readable ISO 8601 and GMT forms, so you can read or generate timestamps without doing the math yourself.

Both measure the time elapsed since 1 January 1970, but at different resolutions. Epoch seconds count whole seconds, so the value has roughly 10 digits today — this is what Unix utilities and `date +%s` produce. Epoch milliseconds count thousandths of a second, giving a 13-digit number, and it is what JavaScript's `Date.now()` and many JSON APIs use. The milliseconds value is simply the seconds value multiplied by 1000, so mixing them up by a factor of 1000 is the most common timestamp bug: a millisecond value fed to a seconds-based field jumps you tens of thousands of years into the future. This converter shows seconds, milliseconds, microseconds, and nanoseconds side by side with a copy button on each, so you can grab the exact unit your database, API, or token expects without miscounting digits.

The converter derives every unit from a JavaScript date, which only tracks time down to the millisecond — it has no built-in way to measure microsecond or nanosecond fractions. To produce those larger units it scales the millisecond value up: microseconds multiply by 1,000 and nanoseconds by 1,000,000. That math is exact for the milliseconds you supply, but it adds trailing zeros rather than real sub-millisecond detail, so a microsecond result always ends in three zeros and a nanosecond result in six. The values are perfectly valid for any system that simply needs the right magnitude or digit count; they just cannot represent precision finer than a millisecond, because that precision was never in the input. If you need true sub-millisecond accuracy, capture it at the source. Otherwise, copy the scaled unit your API requires straight from the result card.

A Unix timestamp marks one absolute instant in time, but a wall-clock date like "15 April 2026, 2:30 PM" is ambiguous until you say which zone it belongs to — 2:30 PM in London is a different moment than 2:30 PM in Tokyo, so each maps to a different epoch number. That is why the date-picker tab asks you to choose a timezone: it resolves your local clock reading into the correct absolute instant before computing the epoch. The tool uses the browser's `Intl` engine and runs a second pass so daylight-saving "spring forward" and "fall back" boundaries still convert correctly. Free-form and bulk inputs follow standard rules: a trailing `Z` or explicit offset is read as UTC, while a bare date is taken in your local zone. Pick the right zone in the picker to get the exact epoch you intend.

The fastest sanity check is the UTC breakdown the tool shows beneath the epoch values: it lists the year, month, day, weekday, hour, minute, and second that your timestamp actually represents, so you can confirm at a glance that the instant matches what you intended. Also compare the ISO 8601 and GMT strings, which spell out the same moment in standard human-readable form. As a rough magnitude test, a present-day epoch in seconds has about 10 digits and one in milliseconds has about 13 — if your number is far off, you likely have the wrong unit. To reverse the check, drop the epoch number into a paired epoch-to-date converter and verify it returns your original date. Enter your date here, glance at the breakdown, and you will know the conversion is right before you copy it.