51.24 seconds
World Mental Calculation, publishing the Memoriad 2024 results on 14 December, records the calendar dates discipline as won by Jay Baldiya Jain of India, who solved 125 dates in 51.24 seconds. The event requires the competitor to determine the day of the week for dates drawn from the range 1600 to 2099.
The arithmetic of the result is stark: an average of about 0.41 seconds per date, including reading it. At that speed the calculation cannot be worked step by step in the usual sense. It has to be compressed into a set of learned offsets for century, year, month and day, applied almost as fast as the date can be taken in.
What calendar calculation is
Calendar calculation is one of the oldest disciplines in mental arithmetic and one of the least forgiving. The Gregorian calendar repeats on a 400-year cycle broken by leap-year rules, so a system that handles 1600 to 2099 has to absorb every exception across five centuries.
Because the answer is one of only seven possibilities, guessing is worthless and errors are obvious. Scoring rewards the combination of speed and correctness, which is why a time is meaningless without the number of dates attached to it. The published figure for Jain gives both: 125 dates, 51.24 seconds.
Memoriad 2024
Memoriad 2024 ran from 6 to 10 November in the United Arab Emirates, with 121 mental calculation competitors from twenty countries and nearly thirty further entrants in the memory events. Competitors selected their own disciplines rather than contesting an all-round title, and no overall champion is listed in the results.
The calculation programme covered ten-digit additions, won by Jeonghee Lee of South Korea; eight-digit multiplications and six-digit square roots, both won by Shashank Jain of India; division by five-digit numbers, won by Kaloyan Geshev of Bulgaria; the calendar dates, won by Jay Baldiya Jain; and the Flash Anzan marathon, won by Lee with Siddhi Mukesh Jain of India second.
India's showing in the UAE
Indian competitors appear across the 2024 results table. Shashank Jain took two golds, Parmar Priyansh Kiritbhai and Tambe Vighnesh Vijay took silver and bronze in the additions, Siddhi Mukesh Jain took silver in the Flash Anzan marathon, and Jay Baldiya Jain won the calendar event.
The memory half of Memoriad went the other way: Mongolia won all six memory disciplines, from the numbers marathon to speed cards. Between them, the two countries accounted for a large share of the 2024 podiums, which is the clearest picture of the sport's centre of gravity the published results offer.
What is documented — and what is not
The firm record is the result: first place in calendar dates at Memoriad 2024, 125 dates in 51.24 seconds, published by World Mental Calculation on 14 December 2024, at a competition held in the UAE from 6 to 10 November with 121 calculators from twenty countries.
Beyond that the record is empty. No age or date of birth, no home town, no school or club, no coach, no photograph and no interview appears in the source. Nor is there any statement of whether the time stands as a world record in the discipline, or any account of results before or after November 2024.
| 人物 | 国家 | 里程碑 | 年龄 / 数据 |
|---|---|---|---|
| Jay Baldiya Jain | 印度 | 日历计算金牌，2024年心算奥林匹克 | — |
| Granth Thakkar | 印度 | 赢得2014年心算世界杯冠军 | — |
| Mekan Nurgeldiyev | 土库曼斯坦 | 12岁以下组铜牌，2026年青少年心算世界锦标赛 | — |
| Abhilakshya Arora | 印度 | 赢得20岁以下青少年心算世界锦标赛冠军… | — |
| Arshika Gupta | 印度 | 12岁以下组世界冠军，心算，2026年 | — |
What is documented — and what is not
✓ Documented
- First place in calendar dates at Memoriad 2024, 125 dates in 51.24 seconds (World Mental Calculation)
- The discipline covers dates from 1600 to 2099
- Memoriad 2024 held 6–10 November in the UAE, 121 calculators from 20 countries
? Unverified, disputed or wrong
- No age, date of birth, home town or school in the source
- No statement of whether the time is a world record in the discipline
- No results recorded before or after November 2024
Questions people ask about Jay Baldiya Jain
What did Jay Baldiya Jain win?
Gold in the calendar dates discipline at Memoriad 2024, solving 125 dates in 51.24 seconds.
What is calendar calculation?
Naming the day of the week on which a given date fell. At Memoriad the dates are drawn from the range 1600 to 2099.
How fast is 125 dates in 51.24 seconds?
About 0.41 seconds per date, including reading it, sustained across the full set.
How old is Jay Baldiya Jain?
No source in this record gives an age or date of birth. The results page lists names, countries, times and placings only.
Is it a world record?
No source in this record describes the time as a world record. It is published as the winning result of the discipline at Memoriad 2024.
Is Jay Baldiya Jain on Wikipedia?
No Wikipedia article was found. The World Mental Calculation results page is the primary published record.
Who else won at Memoriad 2024?
Shashank Jain of India took multiplication and square roots, Jeonghee Lee of South Korea the additions and Flash Anzan, and Kaloyan Geshev of Bulgaria the division event.
Where is he now?
No source in this record says. The published trail ends with the December 2024 results.
Quick quiz: how well do you know Jay’s story?
How many dates did Jay Baldiya Jain solve in 51.24 seconds?
What does the calendar dates discipline ask for?
Which years does the Memoriad calendar event cover?
Sources
- Memoriad 2024: Results — World Mental Calculation, 2024-12-14
Checked by the Geniuses.club editorial team. Ages are given as of September 2026.
