preposition /ˈdjʊəɹɪŋ,ˈdʊəɹɪŋ,ˈdʒʊəɹɪŋ/
a) For all of a given time interval.
I lived with my parents during the 1970s.
b) At any time or period within a given time interval.
The shop was one of the few able to stay open during the war.
Wikipedia foundation.