Date & Time CalculatorTimezone · Dates · Countdown

Free · Private · In-Browser

Dates, times and time zones,
calculated instantly.

Days between two dates, business days, live time zone conversion and event countdowns — all computed locally in your browser. No account, no tracking, works even offline.

Calculate days Convert time zones Start a countdown
100% private — nothing leaves your device Works offline, no API needed Free for everyone, no sign-up
Now UTC+8
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The toolbox

Three tools. Zero friction.

Every result updates live as you type. Bookmark any tool with the star so you can jump straight back next time.

Days Between Two Dates

Count calendar days, business days, weeks and more between any two dates — perfect for deadlines, billing, travel and project planning.

Pick two dates above to see the result instantly.

Time Zone Converter

Convert a time between any two cities, see live local times with offsets and daylight saving, and compare one moment across the world at a glance.

Local time: — —
Local time: — —
Defaults to the current moment. You can edit it after choosing a date.
Pick two locations to see the conversion and time difference.

Same moment, around the world

The selected time shown in major cities, refreshed live.

Event Countdown

Create a live countdown to any event — a launch, a trip, a deadline — save it, pin it, share it, or export it straight to your calendar.

The time you type above is interpreted in this zone.

Your saved countdowns

Saved on this device. Pin important ones, copy a share link, or export to your calendar.

Private by design

Every calculation happens in your browser. Your dates, times and events never leave your device or touch a server.

DST-aware

Time zone conversions and differences automatically account for daylight saving time in each region — no manual guesswork.

Calendar ready

Export any countdown as an .ics file and it appears in Google Calendar, Apple Calendar or Outlook in one click.

Quick answers

Frequently asked questions

How do I calculate the number of days between two dates?
Open the "Days Between Dates" tool, pick a start and an end date, and the answer appears instantly: total days, weeks, business days, hours, minutes and seconds. The calculator counts the full 24-hour days in between and lets you include or exclude the end date.
What is the difference between calendar days and business days?
Calendar days count every day including weekends and holidays. Business days count only Monday to Friday — the days most offices operate. Use business days for delivery promises, payment terms like "Net 30" and project schedules, and calendar days for anything that runs around the clock.
Is the time zone converter accurate during daylight saving time?
Yes. The converter uses your browser's built-in time zone database, so it automatically reflects current UTC offsets and daylight saving rules for every region — no manual adjustments needed.
Does this site collect my data?
No. All calculations run locally in your browser. Your saved countdowns, preferences and bookmarks are stored only in your browser's local storage on your device. Nothing is sent to a server. See our Privacy Policy for details, including how third-party advertising may use cookies.
Can I use the countdown offline?
Yes. Once the page is loaded, every tool works fully offline — the countdown, day calculations and time zone conversions are all computed locally. Only the web fonts need a connection on first load.