Frequently Asked Questions

Every date on Tomorrow Calendar is calculated live in your browser from your device's clock and timezone — nothing is hard-coded or pre-generated. We take today's date in the selected timezone and add one calendar day, correctly handling month-end, year-end, leap years and daylight saving transitions.

The homepage uses Coordinated Universal Time (UTC) by default, since it's meant to be a global reference. Each country page uses that country's primary timezone instead — for example, Indian Standard Time for the India page — so "tomorrow" is accurate for that specific country.

Fixed-date national, federal, bank and statutory holidays are listed with high confidence, based on published government sources. Holidays that depend on lunar or lunisolar observation (like Eid, Diwali or Chinese New Year) are marked "estimated" until officially confirmed — see our Data Sources page for details.

A handful of holidays are set by moon sighting rather than a fixed Gregorian date, so governments often confirm the exact date only shortly beforehand. We show a well-informed estimate in the meantime rather than guessing, and update it once the official date is confirmed.

Seven countries in depth right now: India, the United States, the United Kingdom, Canada, Australia, Singapore and the United Arab Emirates. The homepage itself stays global and isn't biased toward any one of them.

Yes — the site's data structure is built so additional countries can be added without rebuilding the whole architecture. More countries and, eventually, regional-language versions are on our roadmap; see the About page.

Yes, entirely. The calendar, holiday information and every date tool are free with no account required.

Fixed-date holidays are set well in advance and rarely change. Estimated (moon-sighting-dependent) dates are checked and updated as official confirmations become available, and we also update the data whenever a reader reports a correction.

Yes. The Day of the Week, Date Difference and Date Calculator tools use ordinary calendar arithmetic and work for any Gregorian date, whether it's decades in the past or far in the future.

Please use our Corrections page or email hello@tomorrowcalendar.com with the page, the date you checked, and what you expected to see. We read and act on every report.