Sweden's adoption of February 30
- When
- 1711–1712
- Where
- Bender (present-day Moldova); Sweden
- Episodes
- 2
In 1712, Sweden added a unique February 30 to its calendar to revert to the Julian system, following King Charles XII's 1711 order to abandon the isolated Swedish calendar.
Episodes
- Order to Revert
King Charles XII ordered the abandonment of the Swedish calendar and return to the Julian calendar.
- Addition of February 30
Sweden added an extra day to February in 1712 to adjust the calendar back to the Julian standard.
Background and detail
Implementation. To adjust the calendar back to the Julian standard, an extra day was added to February in the leap year of 1712. This created a unique 30-day February and a 367-day year.
People involved
- King Charles XII · Monarch who ordered the calendar change
Sources
- Swedish calendar Wikipedia, revision of 2026-07-21
Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.