Are these date and time tools free?

Yes. Unix conversion, UTC formatting, ISO durations, countdowns, and random time generators are free with no account. Calculations run in your browser.

Is this an authoritative atomic clock or NTP server?

No. “Current time” and live Unix values use your device clock and JavaScript’s Date API. For legal or trading timestamps, use an official time source.

Do my inputs get uploaded?

No. Date strings and numbers you paste are processed locally in the browser—they are not sent to our servers for these tools.

How is this different from the Timestamp Converter in Converters?

The converters category includes a general timestamp tool. This hub groups many focused pages (Unix→UTC, duration parsing, ISO week, business days, etc.) for specific searches. Use whichever page matches your task.

Free date & time tools online

Search for Unix to UTC, convert UTC to Unix, seconds to H:M:S, ISO 8601 duration, or random time generator? We ship 50+ focused tools in one category—each page does one job clearly. Everything runs client-side in your browser (no upload). For a general two-way timestamp box, you can still use the existing timestamp converter under Converters.

Browse all date & time utilities

Open the full category index with every tool listed: Date & Time Tools (Unix, UTC, durations, ISO week, business days, random timestamps, and more).

Unix & UTC

Unix timestamp to UTC — seconds or milliseconds → ISO and GMT-style string.
UTC datetime to Unix — parse a string → Unix seconds.
Live Unix timestamp — updating clock; copy seconds or ms.
Current UTC time — live UTC display.

Durations & formats

Seconds to H:M:S and H:M:S to seconds.
Parse ISO 8601 duration (PT1H30M) and build a duration string.
Duration between two datetimes — paste two ISO lines.

Random & related (elsewhere)

Random time generator — between two clock times.
Random datetime in range and random Unix in range.
Random date generator (Generators) — random calendar date between bounds.
Days calculator — days between two calendar dates.
Date parser — natural language-style parsing helper.

More hubs: free online tools, text tools, converters.

Frequently asked questions

Are these date and time tools free?: Yes. Unix conversion, UTC formatting, ISO durations, countdowns, and random time generators are free with no account. Calculations run in your browser.
Is this an authoritative atomic clock or NTP server?: No. “Current time” and live Unix values use your device clock and JavaScript’s Date API. For legal or trading timestamps, use an official time source.
Do my inputs get uploaded?: No. Date strings and numbers you paste are processed locally in the browser—they are not sent to our servers for these tools.
How is this different from the Timestamp Converter in Converters?: The converters category includes a general timestamp tool. This hub groups many focused pages (Unix→UTC, duration parsing, ISO week, business days, etc.) for specific searches. Use whichever page matches your task.