September 12 Holidays & Observances
4 holidays observed on September 12 in the 2026–2030 window.
Floating holidays on September 12
These observances only land on September 12 in certain years.
| Holiday | 2026 | 2027 | 2028 | 2029 | 2030 |
|---|---|---|---|---|---|
| National Grandparents Day | — | Sep 12 · Sun | — | — | — |
| Mid-Autumn Festival | — | — | — | — | Sep 12 · Thu |
| Programmer's Day | — | — | Sep 12 · Tue | — | — |
View all September holidays
See every observance across September in one monthly calendar.
September calendar →September 12 — quick answers
- How many holidays fall on September 12?
- In the 2026–2030 window, 4 holidays and observance fall on September 12: National Grandparents Day, National Video Games Day, Mid-Autumn Festival, Programmer's Day.
- What is celebrated on September 12?
- September 12 is home to National Grandparents Day, National Video Games Day, Mid-Autumn Festival and other observances. Each one has its own page with history and a live countdown.
- Are any September 12 holidays public holidays?
- None of the observances on September 12 are US federal holidays; they are celebrated informally by people, brands and communities.