JavaScript: Identify a day based on a date
JavaScript Datetime: Exercise-57 with Solution
Write a JavaScript program to get the name of a day based on a given date in string format.
Date format: mm/dd/yyyy
Test Data:
("07/11/2000") -> "Tuesday"
("11/06/2017") -> "Sunday"
("11/26/2017") -> "Not a valid Date!"
Sample Solution:
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Identify a day based on a date</title>
</head>
<body>
</body>
</html>
JavaScript Code:
const days_Name = ['Saturday', 'Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday']
const Date_To_Day = (dt) => {
if (typeof dt !== 'string') {
return 'Argument should be string!'
}
// extract the date
let [day, month, year] = dt.split('/').map((x) => Number(x))
// check the data are valid or not.
if (day < 1 || day > 31 || month > 12 || month < 1) {
return 'Not a valid Date!'
}
if (month < 3) {
year--
month += 12
}
const year_Digits = year % 100
const century = Math.floor(year / 100)
const week_Day = (day + Math.floor((month + 1) * 2.6) + year_Digits + Math.floor(year_Digits / 4) + Math.floor(century / 4) + 5 * century) % 7
return days_Name[week_Day]
}
console.log(Date_To_Day("07/11/2000"))
console.log(Date_To_Day("11/06/2017"))
console.log(Date_To_Day("11/26/2017"))
Sample Output:
Tuesday Sunday Not a valid Date!
Flowchart:

Live Demo:
See the Pen javascript-date-exercise-57 by w3resource (@w3resource) on CodePen.
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