 DST continued to be observed every year in 1920s and 1930s, although some small interruptions had occurred (1922–1923, 1925, 1930 and 1933), as well as DST’s start and end dates which were often changed.In the years 1942–1945, during World War II, Portugal, not only advanced clocks by 1 hour during DST, as also advanced them by another 1 hour during some months of those years, coming to have clocks 2 hours ahead of GMT, during that “double DST”.Situation returned to normality after 1945, with the end of World War II, and normal DST continued to be observed.