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- Public holiday
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Denmarkofficial
Also on this day
Full history →Notable · 2019
The NASA space probe New Horizons flew by the trans-Neptunian object Arrokoth, making it the farthest object visited by a spacecraft.- 2026Bulgaria officially adopts the Euro, becoming the 21st Eurozone country.
- 2026A fire at a bar during New Year's Eve celebrations in Crans-Montana, Switzerland, kills 41 people and injures 116 others.
- 2025Fourteen people are killed and 57 others injured during a vehicle-ramming and shooting attack in New Orleans, Louisiana.