Determination of the day of the week determined for the latter part of the analysis. By using a given day August 13, 2009 which was a Thursday as a reference, with "Base" and "n" being the number of days and weeks it has been since 01/01/0001 to the given day, respectively and "k" the day into the given week which must be less than 7, "Base" is expressed as Knowing that a year divisible by 4 or 400 is a leap year while a year divisible by 100 and not 400 is not a leap year, a software program can be written to find the number of
IAU 100 km European Championships titles each. A total of seventeen European nations have reached the podium. IAU 100 km European Championships The IAU 100 km European Championships is an annual, ultrarunning competition over 100 kilometres for European athletes. It is organised by the International Association of Ultrarunners (IAU) and was first held in 1992 – five years after the launched of the World Championships for the distance. The competition features both an individual and national team component. The team race is decided by aggregated the three best times set by a nation's athletes. In its 22nd edition in 2013, a total of 94 athletes