What Day Is It?What Day Is It? is an independent iPhone app. It tells you which special day it is today, in 28 languages, with holidays from 193 countries. This page explains where the dates come from and how to contact us.
Key facts
| App | What Day Is It? (App Store name: Special Days: What Day Is It?) |
| Platform | iPhone (iOS) |
| Price | Free, optional Premium from $2.99 a month |
| Languages | 28 |
| Countries | 193 |
| Current version | 1.3 (November 2026) |
| Contact | gunlerdenne.app@gmail.com |
How we build the calendar
- Public holidays come from official calendars and are checked against the open-source date-holidays dataset. Moving holidays (Easter, Thanksgiving, Mother’s Day, Ramadan and Eid) are calculated for each year.
- International days follow the United Nations list of international days and weeks.
- Awareness days and fun days come from the organisations that run them and from popular observance calendars. Fun days are unofficial: different sources sometimes give different dates. We leave out a fun day when we cannot confirm its date.
- Descriptions are written by us: one short, plain sentence per day. Days of remembrance get a calm tone and no celebration message.
The calendar on this site uses the same data as the app. The main day is chosen for the United States on the English pages and for Türkiye on the Turkish pages; in the app it follows your home country.
Found a wrong date?
Write to gunlerdenne.app@gmail.com with the day and a source. We check it and fix the app and this site.
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Frequently asked questions
Who makes What Day Is It?
It is made by an independent developer. You can reach us at gunlerdenne.app@gmail.com.
Where do the holiday dates come from?
Public holidays from official calendars and the open-source date-holidays dataset, international days from the United Nations list, and fun days from popular observance calendars. Fun days are unofficial.
How do I report a wrong date?
Email gunlerdenne.app@gmail.com with the date and a source. We fix the app and the website.