When a country switched calendars, people sometimes skipped several days to catch up with the seasons.

The longer version

Adopting the reformed calendar meant deleting the accumulated error at once. In countries that changed in 1582, the day after a Thursday in early October was declared to be the following Friday over a week later, and ten dates simply never happened. Officials published tables showing the new dating.

Later adopters skipped more: by the eighteenth century the gap had grown to eleven days, and some states lost nearly two weeks. Stories of people rioting over lost days are largely exaggerated, but legal confusion over rents, wages and contracts was real enough. Diaries from the period often note both dates side by side.

Where this entry sits

These facts wander through clocks, calendars, time zones, and the long human effort to measure passing hours. You will find leap years, odd month lengths, ancient sundials, and the reasons modern timekeeping works the way it does. The full list sits on the Time and Calendars page, where every entry is listed in order.