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Wikipedia uses several templates that self-update every day to keep date and age information current. These are very useful for a dynamic online encyclopedia and save users from having to regularly update that kind of information. However, when using this kind of template, a few things should be kept in mind.
With M = 365 days in a year, the average number of people required to find a pair with the same birthday is n = 1 + Q(M) ≈ 24.61659, somewhat more than 23, the number required for a 50% chance. In the best case, two people will suffice; at worst, the maximum possible number of M + 1 = 366 people is needed; but on average, only 25 people are ...
Happy birthday! This year, Leap Day is Thursday, Feb. 29, 2024. If you were born on Leap Day 1924, you would be 100 years old or 25 in Leap Day years.
Note: The template may not calculate the age correctly if a full date (month, day, year) is not provided. For example, a person who was born in 1941 could be either 83 or 84, depending on whether they have reached their birthday in the current year: {{Birth-date and age|1941}} → 1941 () (age 84)
The correct answer, of course, is "infinite", as there is nothing preventing, for example, everyone from being born on the same day. But given the number of people, what is the probability of every day in the year being someone's birthday? For 1 to 364 people, it is 0, i.e. such a thing is impossible.
that the person in question was born some time in 1970; and; that the present date is 30 January 2025. If the person was born after 30 January 1970 then they will be 54 years old on 30 January 2025 as they have not had their 55th birthday yet. On the other hand, if they were born exactly on or before 30 January 1970, then they will be 55 years old.
The basic approach of nearly all of the methods to calculate the day of the week begins by starting from an "anchor date": a known pair (such as 1 January 1800 as a Wednesday), determining the number of days between the known day and the day that you are trying to determine, and using arithmetic modulo 7 to find a new numerical day of the week.
Many know that the prefix oct- means eight, as in octopus or octagon. But why does October, the 10th month of the year, have this prefix?