Vietnam Vietnam’s new marriage law goes into effect, abolishing regulations that “prohibit marriage between people of the same sex.”
Eurasian Economic Union The Eurasian Economic Union between Russia, Kazakhstan, Belarus, Kyrgyzstan and Armenia comes into effect
Palestinian The Palestine Authority signs a treaty to join and participate in the International Criminal Court.
Chick-fil-A U.S. fast-food restaurant chain Chick-fil-A warns that a security breach may have leaked credit card details of 9,000 customers in five states.
Lithuania adopts the euro Lithuania adopts the euro as its official currency, becoming the 19th member of the Eurozone.
Killarney, Calgary A shooting kills one and injures six people in Killarney, Calgary, Canada, with police making no arrests.
Terrorism in Yemen The death toll of the suicide bombing in Ibb, Yemen, that occurred on December 31 rises to 49 with the injury count rising to 70.