Historical dates
The UN Charter: signing and entry into force
June 26 and October 24 mark different stages in the same institution's beginning.
Two dates, two precise labels
The United Nations records that its Charter was signed in San Francisco on June 26, 1945, and entered into force on October 24, 1945. These dates answer different questions. Signing records one stage of agreement; entry into force records when the Charter became operative under its requirements. A history-based discovery should preserve those labels instead of treating either as an interchangeable birthday.
Try the annual comparison
The recurring dates June 26 and October 24 are 120 days apart. That interval is one day beyond 17 complete weeks, so they never share a weekday within the same year. In 2026 June 26 is Friday and October 24 is Saturday. Both lie after February, which means leap years move their weekdays together and preserve that one-day difference.
Why a negative result can teach more
The two milestones belong to one historical story even though their annual weekdays do not align. That is a useful reminder that the site asks a narrow date question. It does not discover the institutional or legal connection, which the documentary source already explains. When comparing an organization's founding, registration or opening, choose one definition and keep it consistent. You can then explore the date without pretending that a calendar pattern determines the significance of the institution or the people associated with it.
Sources and checking
Source facts checked 2026-10-18. Editorial draft; final review pending. Calendar comparisons are our calculations. A source supports the recorded date, not a personal relationship or endorsement.
- United Nations: UN Charter ↗
Signed June 26, 1945; entry into force October 24, 1945.
- US Naval Observatory: Leap Years ↗
Gregorian leap rule; weekday conclusions are our calculations.