| Listed below are the verified claims for the record listed. |
| 1. |
This record is for the greatest number of days of the week correctly identified from random dates between 1 January 1600 and 31 December 2100.
Yusnier Viera Romero (USA) solved 159 such tasks correctly on 9 March 2024
at Miami Dade College, Florida, USA. |
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| 1. |
This record is for the greatest number of days of the week correctly identified from random dates between 1 January 1600 and 31 December 2100.
Yusnier Viera Romero (USA) solved 140 such tasks correctly on 27 January 2018. |
| 2. |
This record is for the greatest number of days of the week correctly identified from random dates between 1 January 1600 and 31 December 2100.
Jan van Koningsveld (Germany) solved 96 such tasks correctly at Früchteburg School in Emden, Germany on 24 October 2015. |
| 3. |
This record is for the greatest number of days of the week correctly identified from random dates between 1 January 1600 and 31 December 2100.
Yusnier Viera Romero (Cuba) broke the record on 4 December 2010, correctly identifying the days of 93 dates in one minute. |
| 4. |
This record is for the greatest number of days of the week correctly identified from random dates between 1 January 1600 and 31 December 2100.
Jan van Koningsveld (Germany) solved 78 such tasks within one minute on 7 September 2010 at Mathematikum in Gießen, Germany. |
| 5. |
This record is for the greatest number of days of the week correctly identified from random dates between 1 January 1600 and 31 December 2100.
Freddis Reyes Hernandez (Cuba) solved 74 such tasks within one minute at the Mental Calculation World Cup 2010 in Magdeburg, Germany on 5 June 2010 (which - by the way - was Saturday). |
| 6. |
This record is for the greatest number of days of the week correctly identified from random dates between 1 January 1600 and 31 December 2100.
Jan van Koningsveld (Germany) broke the record no less than four times on 12 March 2010 in Emden, identifying 63, 66, 69 and finally even 70 dates of the week correctly. |
| 7. |
This record is for the greatest number of days of the week correctly identified from random dates between 1 January 1600 and 31 December 2100.
Yusnier Viera Romero (Cuba) broke the record on 5 December 2009 correctly identifying the days of 59 dates in one minute in Miami, Florida.
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| 8. |
This record is for the greatest number of days of the week correctly identified from random dates between 1 January 1600 and 31 December 2100. Yusnier Viera Romero (Cuba) broke the record on 18 December 2006 correctly identifying the days of 56 dates in one minute at a TV studio in Havana.
The same result has been achieved by Jan van Koningsveld (Germany) on 2 November 2008 at the Memoriad 2008 in Istanbul, Turkey. |
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