Eugen Mittwoch moved via Paris to London with his immediate family. During the last 18 months of his life, he worked for the Middle East department of the British Ministry of Information under the leadership of Ernst Jaeckh. The remaining family, including his mother, who was murdered in Bergen-Belsen, perished in the Shoah. A daughter Adele Mittwoch (1925 - 2011) was a renowned psychotherapist in England, specializing in group psychotherapy, another daughter Agnes (born 1926) later immigrated to Israel ( made aliyah ) and was a university lecturer in Jerusalem. The oldest daughter, Ursula, born 1924, was professor for human genetics at
Determination of the day of the week his collected works in 1927. Gauss' method was applicable to the Gregorian calendar. He numbered the weekdays from 0 to 6 starting with Sunday. He defined the following operation: The weekday of 1 January in year number is where is the remainder after division of by , or modulo . This formula was also converted into graphical and tabular methods for calculating any day of the week by Kraitchik and Schwerdtfeger. Another variation of the above algorithm likewise works with no lookup tables. A slight disadvantage is the unusual month and year counting convention. The formula is where For example,