[Hot] How to find day 2025
Posted: Mon Mar 16, 2026 8:42 pm
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Recently we learnt a very impressive trick: tell us the date you were born and we will almost immediately tell you what day of the week that was. This trick is a favourite of savants and lightning calculators. We are not in their league, we are merely average.
Click here for how to find day
But still, we can perform the calendar trick almost as quickly, and without cheating: we really do all the mental calculations required. On what day of the week were you born? Recently we learnt a very impressive trick: tell us the date you were born and we will almost immediately tell you what day of the week that was. This trick is a favourite of savants and lightning calculators. We are not in their league, we are merely average. But still, we can perform the calendar trick almost as quickly, and without cheating: we really do all the mental calculations required. Mathemagician Art Benjamin performing the calendar trick. --> In fact, most people could do exactly what we do, just after a little bit of practice. Our goal here is to show you how. Doing it the hard way. Let's look back to Thursday, 25 May 1961, when President Kennedy announced the goal to land a man on the Moon. Finally, on 20 July 1969 Neil Armstrong stepped on the Moon, and you want to know what day of the week that was. How could you do it? Enter the date of your birth and push the button. (If it doesn't work, check that JavaScript is enabled in your web browser.) The difference between the two dates is six ordinary years, two leap years, one 31-day month and one 30-day month, and then go backwards five days (from the 25th of the month to the 20th). Summing up, there are a total of (6 x 365) + (2 x 366) + (31 + 30) − 5 = 2978 days between the two dates. Dividing by 7, we get 425 weeks with 3 days left over. Since 25 May 1961 is a Thursday, it will be Thursday again 425 weeks later, and 3 days after that will be a Sunday. So, 20 July 1969 is a Sunday. Ta da! But let's be realistic. It is very unlikely that you could perform these calculations quickly enough to impress anyone. And neither could we. Doing it quickly: four easy pieces. As our example illustrates, it is fundamentally straightforward to calculate the day of the week of any date. All we need is the day for a convenient reference date, together with the basic facts about our Gregorian calendar: the lengths of the months and the rules for leap years. The key is to streamline the calculations as much as possible. Many people have written about this calendar trick, and there are as many approaches. Here, we have attempted to simplify the procedure as much as possible for dates in the most commonly requested range. So, our recipe works very well for an audience of real people, but not so well if you are confronted by, say, the ghost of Marie Antoinette. Our recipe has three big advantages: The amount of memorisation and calculation required is kept to a minimum. The most difficult calculations are to add on single-digit numbers, and to find the remainder after dividing by 7. Each calculation requires only one of the day, month or year components of the given date. This means that you can begin to calculate while the date is still being read out to you. We'll assume that you're already a pro at adding on single-digit numbers. Then, the key to becoming super quick at the date trick is to become really good at finding remainders after dividing by 7. Also, you will have to memorise the green and purple tables below. (It used to be you had to memorise times tables: now it's Time tables!) The four main parts of the calculation are described below. In order to help you master them, we have prepared a separate practice web page. This page generates random numbers and dates for you to test yourself, with the answers within easy (but not too easy) reach. Pressing the button will open a separate page for practising the calculations. Remainder after dividing by 7. You will have to practise finding the remainder of numbers (from 0 to 54) when divided by 7. The possible remainders are from 0 up to 6. For example, 0, 7, and 14 all leave a remainder of 0, 33 leaves a remainder 5, and 52 leaves a remainder of 3. Month offset. Each of the twelve months is assigned a number, as given in the following table: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 6 2 2 5 0 3 5 1 4 6 2 4. You must memorise this table, but it is not as hard as it may seem. One helpful approach is to split the twelve numbers into four groups of three: 622, 503, 514 and 624. Note that the first and last groups only differ in the final spot, and that the second and third groups are also similar, only differing by 1 in the second and third spots. Decade offset. Each decade is also assigned an offset number. The decade offsets for 1900 to 2010 are given in the following table: 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010 1 6 5 3 2 0 6 4 3 1 0 5 Again, you can identify mini-patterns to help memorise the table. For example, 16 and 32 and 64 appear in the table, with 3 the offset for the 1930s and 6 the offset for the 1960s. Leap year offset. The final ingredient is to account for leap years. These are counted from the previous turn of the decade, and are given by the following table: 0 1 2 3 4 5 6 7 8 9 even 0 0 0 0 1 1 1 1 2 2 odd 0 0 1 1 1 1 2 2 2 2 For example, 1937 appears in an odd decade (since 3 is odd), and the table gives us a leap year offset of 2 (look it up under 7 in the odd row). This offset accounts for the two leap years after 1930 and up to 1937: that is, 1932 and 1936. It is easy enough to memorise the table of leap year offsets, but it is probably better to not bother. Instead, it is easier to simply remember the relevant leap years: 4 and 8 in even decades, and 2 and 6 in odd decades. Then, we just count 1 for each leap year after the turn of the decade. Let's do it! (1900 to 2019) We'll now go through the complete details of a birthday calculation, using the great boxer Muhammad Ali as our example.
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Article:
|
Recently we learnt a very impressive trick: tell us the date you were born and we will almost immediately tell you what day of the week that was. This trick is a favourite of savants and lightning calculators. We are not in their league, we are merely average.
Click here for how to find day
But still, we can perform the calendar trick almost as quickly, and without cheating: we really do all the mental calculations required. On what day of the week were you born? Recently we learnt a very impressive trick: tell us the date you were born and we will almost immediately tell you what day of the week that was. This trick is a favourite of savants and lightning calculators. We are not in their league, we are merely average. But still, we can perform the calendar trick almost as quickly, and without cheating: we really do all the mental calculations required. Mathemagician Art Benjamin performing the calendar trick. --> In fact, most people could do exactly what we do, just after a little bit of practice. Our goal here is to show you how. Doing it the hard way. Let's look back to Thursday, 25 May 1961, when President Kennedy announced the goal to land a man on the Moon. Finally, on 20 July 1969 Neil Armstrong stepped on the Moon, and you want to know what day of the week that was. How could you do it? Enter the date of your birth and push the button. (If it doesn't work, check that JavaScript is enabled in your web browser.) The difference between the two dates is six ordinary years, two leap years, one 31-day month and one 30-day month, and then go backwards five days (from the 25th of the month to the 20th). Summing up, there are a total of (6 x 365) + (2 x 366) + (31 + 30) − 5 = 2978 days between the two dates. Dividing by 7, we get 425 weeks with 3 days left over. Since 25 May 1961 is a Thursday, it will be Thursday again 425 weeks later, and 3 days after that will be a Sunday. So, 20 July 1969 is a Sunday. Ta da! But let's be realistic. It is very unlikely that you could perform these calculations quickly enough to impress anyone. And neither could we. Doing it quickly: four easy pieces. As our example illustrates, it is fundamentally straightforward to calculate the day of the week of any date. All we need is the day for a convenient reference date, together with the basic facts about our Gregorian calendar: the lengths of the months and the rules for leap years. The key is to streamline the calculations as much as possible. Many people have written about this calendar trick, and there are as many approaches. Here, we have attempted to simplify the procedure as much as possible for dates in the most commonly requested range. So, our recipe works very well for an audience of real people, but not so well if you are confronted by, say, the ghost of Marie Antoinette. Our recipe has three big advantages: The amount of memorisation and calculation required is kept to a minimum. The most difficult calculations are to add on single-digit numbers, and to find the remainder after dividing by 7. Each calculation requires only one of the day, month or year components of the given date. This means that you can begin to calculate while the date is still being read out to you. We'll assume that you're already a pro at adding on single-digit numbers. Then, the key to becoming super quick at the date trick is to become really good at finding remainders after dividing by 7. Also, you will have to memorise the green and purple tables below. (It used to be you had to memorise times tables: now it's Time tables!) The four main parts of the calculation are described below. In order to help you master them, we have prepared a separate practice web page. This page generates random numbers and dates for you to test yourself, with the answers within easy (but not too easy) reach. Pressing the button will open a separate page for practising the calculations. Remainder after dividing by 7. You will have to practise finding the remainder of numbers (from 0 to 54) when divided by 7. The possible remainders are from 0 up to 6. For example, 0, 7, and 14 all leave a remainder of 0, 33 leaves a remainder 5, and 52 leaves a remainder of 3. Month offset. Each of the twelve months is assigned a number, as given in the following table: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 6 2 2 5 0 3 5 1 4 6 2 4. You must memorise this table, but it is not as hard as it may seem. One helpful approach is to split the twelve numbers into four groups of three: 622, 503, 514 and 624. Note that the first and last groups only differ in the final spot, and that the second and third groups are also similar, only differing by 1 in the second and third spots. Decade offset. Each decade is also assigned an offset number. The decade offsets for 1900 to 2010 are given in the following table: 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010 1 6 5 3 2 0 6 4 3 1 0 5 Again, you can identify mini-patterns to help memorise the table. For example, 16 and 32 and 64 appear in the table, with 3 the offset for the 1930s and 6 the offset for the 1960s. Leap year offset. The final ingredient is to account for leap years. These are counted from the previous turn of the decade, and are given by the following table: 0 1 2 3 4 5 6 7 8 9 even 0 0 0 0 1 1 1 1 2 2 odd 0 0 1 1 1 1 2 2 2 2 For example, 1937 appears in an odd decade (since 3 is odd), and the table gives us a leap year offset of 2 (look it up under 7 in the odd row). This offset accounts for the two leap years after 1930 and up to 1937: that is, 1932 and 1936. It is easy enough to memorise the table of leap year offsets, but it is probably better to not bother. Instead, it is easier to simply remember the relevant leap years: 4 and 8 in even decades, and 2 and 6 in odd decades. Then, we just count 1 for each leap year after the turn of the decade. Let's do it! (1900 to 2019) We'll now go through the complete details of a birthday calculation, using the great boxer Muhammad Ali as our example.
how to find a spa
how to find cvor start date
how can i find the date i joined facebook
how to find great deals on amazon