How this site works

What you will find here

• A page for every calendar day with events, births, deaths, milestones and recurring observances, grouped and dated.
• A page for every year we hold records for, so you can read history along the other axis.
• Birthday pages that combine the history of a date with the facts about being born on it.
• People pages with life dates, a short biography and the days that matter to them.
• Date tools for ages, weekdays, day numbers, countdowns and the rest — each one showing its working.

Where the facts come from

1. Our own editorial entries come first. These are written here, flagged as editorial, and given priority in every list.
2. Wikipedia’s on-this-day feed supplies the bulk of the calendar: the selected events, births and deaths each language edition records for a date.
3. Wikidata adds structured facts — exact dates, places, occupations, awards, what an event followed and what followed it.
4. Computed facts — day of the year, weekday, week number, zodiac, season, anniversaries, ages — are worked out from the calendar here, not copied from anywhere.

How fresh it is

A date is filled the first time someone opens it and then stored, so the second visit is instant. Stored dates are re-checked for new entries about every 90 days. The longer encyclopedia panel on an entry page is built once and refreshed at most every 180 days. Nothing is re-fetched on every page view, which keeps the site fast and keeps load off the sources.

Where AI is used, and where it is not

Facts, dates, names and lists are never generated. When the free sources leave one of the standard encyclopedia headings empty — for example “what came before” on a minor event — an AI summary may fill that single heading from the material already on the page. Panels written that way are labelled on the page. If you are citing something, follow the source links.

Corrections

History pages carry the errors of their sources. If something is wrong, tell us the page address and what it should say. Editorial entries are corrected here; source errors we pass upstream where we can, and note on the page in the meantime.