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re-formate wth standard.js

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This commit is contained in:
Suryapratap Singh
2021-08-23 12:34:17 +05:30
parent cd26e97514
commit 63c7732dda
1 changed files with 21 additions and 21 deletions
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42
Conversions/DateToDay.js
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@ -1,12 +1,12 @@
/*
DateToDay Method
----------------
The DateToDay method takes a date in string format and
returns the name of a day. The approach behind this method
is very simple, we first take a string date and check
whether their date is valid or not, if the date is valid
then we do this But apply the algorithm shown below. The
algorithm shown below gives us the number of the day and
The DateToDay method takes a date in string format and
returns the name of a day. The approach behind this method
is very simple, we first take a string date and check
whether their date is valid or not, if the date is valid
then we do this But apply the algorithm shown below. The
algorithm shown below gives us the number of the day and
finally converts it to the name of the day.
Algorithm & Explanation : https://cs.uwaterloo.ca/~alopez-o/math-faq/node73.html
@ -14,18 +14,18 @@
// March is taken as the first month of the year.
const calcMonthList = {
1: 11,
2: 12,
3: 1,
4: 2,
5: 3,
6: 4,
7: 5,
8: 6,
9: 7,
10: 8,
11: 9,
12: 10
1: 11,
2: 12,
3: 1,
4: 2,
5: 3,
6: 4,
7: 5,
8: 6,
9: 7,
10: 8,
11: 9,
12: 10
}
// show the week day in a number : Sunday - Saturday => 0 - 6
@ -47,16 +47,16 @@ const DateToDay = (date) => {
// extarct the date
const [day, month, year] = date.split('/').map((x) => Number(x))
// check the data are valid or not.
if ( day < 0 || day > 31 || month > 12 || month < 0) {
if (day < 0 || day > 31 || month > 12 || month < 0) {
return new TypeError('Date is not valid.')
}
// divide year to century and yearDigit value.
const yearDigit = (year % 100)
const century = Math.floor(year / 100)
// Apply the algorithm shown above
const weekDay = Math.abs((day + Math.floor((2.6 * calcMonthList[month]) - 0.2) - (2 * century) + yearDigit + Math.floor(yearDigit/4) + Math.floor(century/4)) % 7)
const weekDay = Math.abs((day + Math.floor((2.6 * calcMonthList[month]) - 0.2) - (2 * century) + yearDigit + Math.floor(yearDigit / 4) + Math.floor(century / 4)) % 7)
// return the weekDay name.
return daysNameList[weekDay];
return daysNameList[weekDay]
}
// Example : DateToDay("18/12/2020") => Friday