On 30 January 1933, the new cabinet was sworn in during a brief ceremony in Hindenburg's office. The NSDAP gained three posts: Hitler was named chancellor, Wilhelm Frick Minister of the Interior, and Hermann Göring Minister of the Interior for Prussia.
The Tet Offensive began on 30 January 1968, as over 100 cities were attacked by over 85,000 enemy troops, including assaults on key military installations, headquarters, and government buildings and offices, including the U.S. Embassy in Saigon.
On 30 January, ARBiH and HVO leaders met in Vitez, together with representatives from UNPROFOR and other foreign observers, and signed a ceasefire in the area of central Bosnia, which came into effect on the following day.
Also on 30 January 1999 the Contact Group issued a set of "non-negotiable principles" which made up a package known as "Status Quo Plus"—effectively the restoration of Kosovo's pre-1990 autonomy within Serbia, plus the introduction of democracy and supervision by international organisations.
On 30 January 1999 NATO issued a statement announcing that the North Atlantic Council had agreed that "the NATO Secretary General may authorize air strikes against targets on FRY territory" to "[compel] compliance with the demands of the international community and [to achieve] a political settlement".
Following Milošević's transfer, the original charges of war crimes in Kosovo were upgraded by adding charges of genocide in Bosnia and war crimes in Croatia. On 30 January 2002, Milošević accused the war crimes tribunal of an "evil and hostile attack" against him.
Anti-American protests broke out around the country and the Pakistani government condemned the U.S. attack and the loss of innocent life. On January 30, a new video was released showing al-Zawahiri unhurt. The video discussed the airstrike, but did not reveal if al-Zawahiri was present in the village at that time.
At the 2009 Australian Open, Nadal won his first five matches without dropping a set, before defeating compatriot Fernando Verdasco in the semifinals in the second longest match in Australian Open history at 5 hours and 14 minutes.
By the end of the 2011–12 Serie B andata (first half of the season), Immobile had already scored 14 league goals. On 30 January 2012, Genoa confirmed that they had paid €4 million for half of the player's rights from Juventus, following his mercurial form in Serie B. He completed his season with Pescara in the Italian second division, as the club won the league title and sealed promotion to the Serie A. He also went on to become the Serie B season's top scorer with a total of 28 goals, seven more than the second-highest scorer, Juve Stabia's Marco Sau.
Citing 7736 cases essentially in China and 82 cases abroad across 18 countries as of 30 January, the World Health Organization declared the novel coronavirus outbreak to be a Public Health Emergency of International Concern on 30 January.
On 30 January 2020, following confirmation of human-to-human transmission outside of China and the increase in number of cases in other countries, the WHO declared the outbreak a Public Health Emergency of International Concern (PHEIC), the sixth PHEIC since the measure was first invoked during the 2009 Swine flu pandemic. Tedros clarified that the PHEIC, in this case, was "not a vote of no confidence in China", but because of the risk of global spread, especially to low- and middle-income countries without robust health systems.
Outside Mainland China, some cruise ships were quarantined after passengers developed symptoms or tested positive for 2019-nCoV. The Costa Smeralda was quarantined on 30 January off Civitavecchia in Italy, after passengers developed flu-like symptoms – the quarantine was lifted when tests for the virus came back negative. Two further ships were quarantined on 5 February: Diamond Princess in the Port of Yokohama, Japan and World Dream, which returned to Hong Kong after being refused entry to Kaohsiung, Taiwan. In both cases, passengers and crew tested positive and the ships remained quarantined as of 6 February.