localdatetime Open local time

Your Local Date and Time

Every format at once — ISO 8601, RFC 2822, epoch, week number, day of year — each one copyable.

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More on localdatetime.now

Epoch Converter Epoch The live epoch, plus conversion between any timestamp and a readable date. ISO 8601 Formatter ISO 8601 Turn any date and time into every ISO 8601 form — extended, basic, week date and ordinal. UTC Offset Check Offset Your current offset, your standard offset, your IANA zone, and whether daylight saving is in effect.

localdatetime.now answers one question completely: what time is it here, in whatever format you need it. The local date and time page shows every notation at once with copy buttons; the epoch converter handles Unix timestamps; the ISO 8601 formatter covers the standard's less familiar forms; and the offset checker reports your zone and daylight saving state. Everything runs in your browser.

Built for people who work with dates

Most date bugs come from three habits: storing a local time without its zone, trusting a three-letter abbreviation, and confusing an offset with a zone. The tools here make the correct values easy to grab, and the guides explain the standards behind them — ISO 8601, the Unix epoch, ISO week numbering, leap seconds and the 2038 boundary.

From our guides

Browse all articles →
Reference Date Formats Around the World: Who Writes What, and Why A reference to the three ways the world orders day, month and year, which countries use each, why 03/04 is genuinely ambiguous, and what to write instead. 6 min read Concepts explained Browser Local Time: How Browsers Determine the Time You See Where a web page gets the time it shows you: the operating system clock, the configured zone, the IANA database, and the JavaScript APIs that read them. 5 min read Concepts explained ISO 8601 Explained: The Date Format That Ends Ambiguity How the ISO 8601 date and time standard is built: field ordering, the T separator, Z and numeric offsets, durations and intervals, and why the format sorts correctly as plain text. 6 min read Reference ISO Week Numbers: The First Thursday Rule Explained The rules behind ISO week numbering: weeks start on Monday, week 1 holds the first Thursday of January, and the consequences that follow at every year boundary. 5 min read Concepts explained Leap Seconds Explained: Why Clocks Occasionally Gain a Second Why an extra second is occasionally inserted into Coordinated Universal Time, who decides, how computers cope with a minute of 61 seconds, and why the practice is ending. 5 min read Reference RFC 2822 vs ISO 8601: Two Timestamp Formats and When to Use Each A side-by-side reference on the RFC 2822 email date format and ISO 8601, covering where each is required, how RFC 3339 fits in, and which one to write. 5 min read Concepts explained The Year 2038 Problem: When 32-Bit Time Runs Out Why 32-bit systems stop being able to tell the time at 03:14:07 UTC on 19 January 2038, which parts of the stack are already fixed, and which are not. 5 min read Concepts explained Unix Epoch Time Explained: Seconds Since 1970 What a Unix timestamp actually counts, why the origin is 1 January 1970, how to tell seconds from milliseconds, and why the number carries no time zone of its own. 6 min read

Frequently asked questions

Is localdatetime.now free?
Yes — free, no signup, no download, no rate limit.
What is the current Unix timestamp?
The epoch converter shows it live in both seconds and milliseconds, and every value on the site is copyable.
Is my data sent to a server?
No. Every value is derived from your own device's clock and time zone setting, entirely in the browser.
What is the difference between UTC offset and time zone?
An offset is a fixed number of hours from UTC at a moment in time. A time zone is a place with rules that change its offset across the year.
Which date format should I use in code?
ISO 8601, stored in UTC, with the IANA zone identifier recorded separately when the location matters.