Anniversary of the Soviet invasion of Poland
Thursday, September 17, 2026
Weekday
Thursday
Week
38
Day of year
260
Country
🇵🇱 PL
PLN
About this holiday
We're still researching this holiday. Check back soon for a full description.
Anniversary of the Soviet invasion of Poland · 2025–2030
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Assumption
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Tuesday·observance
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Holiday data is sourced from open data and may not reflect last-minute regulatory changes. Verify with official sources before legal or financial decisions.