Time converter

Type a timestamp or a date. Numbers are read by their length — up to 11 digits as seconds, 13 as milliseconds, 16 as microseconds, 19 as nanoseconds — or choose the unit, including Excel serial dates, Apple Cocoa, NTP, GPS, .NET ticks, Windows FILETIME, and WebKit/Chrome times. Dates can be ISO 8601 (with or without an offset), RFC 2822, DD.MM.YYYY, or most things a browser understands; dates without an offset are read in the zone you choose. Nanosecond precision is kept exactly.

The results show the instant in UTC and in any display zone, as Unix time in every unit, ISO week, day of year, quarter, Julian day, and the other epochs — each with a copy button.

World clock lists the instant (or now, live) in as many zones as you like, with offsets, abbreviations, and day changes.
Date calculator adds or subtracts years, months, weeks, days, hours, minutes, and seconds using calendar rules in the display zone (31 January plus one month is 28 February, and adding a day across a DST change keeps the wall-clock time), and measures the difference to another date in every unit, as a calendar breakdown, and in business days.

Presenting

The Unix clock ticking, huge, with milliseconds, UTC and local time, and a countdown to the comparison date. Press ⛶ Present (beside Share link) or F to open it; Esc or F closes it and T switches between dark and light. It goes full screen where the browser allows, otherwise it fills the window, and keeps the screen awake. Controls and the pointer fade after a few idle seconds.

Share link → Link options → Open in presentation mode makes a link that opens straight into this view. Browsers only allow real full screen after a click, so a link opened cold shows the view filling the window with a “Click for full screen” button.

Share link copies a URL that opens this tool exactly as you have it. Hand-written links work too: ?t=1760054400&tz=Asia/Tokyo (t takes anything the converter does; a shared "now" is pinned to the moment you shared it). Also unit, in (reading zone), zones (world clock, comma-separated), world=now, the calculator’s years…seconds, and other. For example ?t=2038-01-19T03%3A14%3A08Z&tz=UTC.

Presenting

Sharing