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How to find the week day of (any) given date? [duplicate] Say we need to know in which week-day was June $25,2019$ ? 1 Answer 1.
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To determine the week-day of a given date, we need to: find out
How to find the week day of (any) given date? [duplicate] Say we need to know in which week-day was June $25,2019$ ? 1 Answer 1. To determine the week-day of a given date, we need to: find out whether the given year is common" or "leap". know $\left \lfloor a \right \rfloor$ . To find out whether the given year is "common" or "leap", we can use the following chart: $\mod(a,b)$ means the remainder when dividing $a$ by $b$ . For example, when we divide $17$ by $3$ , we get $5$ and the remainder is $2$ . Therefore, $\mod(17,3)=2$ . For convince, $\mod(a,100)=$ the number formed by the last two digits of $a$ . For example, $\mod(13527,100)=27$ . $\left \lfloor a \right \rfloor$ means the nearst integer less than or equal to $a$ . For examples, $\left \lfloor 6.97 \right \rfloor=6$ , $\left \lfloor -2.8 \right \rfloor=-3,\left \lfloor \frac \right \rfloor=5$ . Suppose that the given date is of the form: MONTH $d, y$ We have to calculate the following: $D = d$ which is the given date. $E =\left \lfloor \frac \right \rfloor$ $F=0,3,2,5,0,3,5,1,4,6,2,$ or $4$ depending on the given month (Jan, Feb, March, . or Dec) respectively. The week-day depends on the $H$ value, $0$ for Sunday, $1$ for Monday, $2$ for Tuesday, $3$ for Wednesday, $4$ for Thursday, $5$ for Friday, and $6$ for Saturday. Consider the example, June $25,2019$ Since $2019$ is not divisible by $4$ , then $2019$ is a common year. $B= \left \lfloor \frac \right \rfloor=4$ $E= \left \lfloor \frac \right \rfloor=5$ $G=0$ since the given month is neither Jan nor Feb. I noticed that many people ask about this. I posted this way because I think it is the simplest way for any given date , whatever the given century. There are some simpler ways but for years between 2000 and 2099 only. So it is a general way.
how to find out the day of a particular date