function computeBirthdays() {
// An array. Each element is the number of times my birthday
// will occur. For the moment: 0 times on a Monday, 0 times on Friday
// etc.
var dayOfTheWeek = [0,0,0,0,0,0,0];
var birthday = document.querySelector("#birthday").value;
// birthday is the value of the input field,
// as a string (ex: "1965-4-16")
// Let's turn it into a Date object
var birthdayAsDate = new Date(birthday);
// Get the month and year (ex: 16 April)
var birthdayMonth = birthdayAsDate.getMonth(); // ex: April
var birthdayDate = birthdayAsDate.getDate(); // ex: 16
var startYear = document.querySelector("#start").value;
var endYear = document.querySelector("#end").value;
for (var year = startYear; year <= endYear; year++) {
var dayOfTheWeekMyBirthDayOccurs =
new Date(year, birthdayMonth, birthdayDate).getDay();
console.log('Year : ' + year + " Day of your birthday: " +
getDayName(dayOfTheWeekMyBirthDayOccurs));
// increment the counter for this day
dayOfTheWeek[dayOfTheWeekMyBirthDayOccurs]++;
}
// add a table to the web page, presenting the results
displayResults(dayOfTheWeek);
}
function getDayName(dayIndex) {
var days = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
return days[dayIndex];
}
function displayResults(array) {
document.querySelector("#results").innerHTML = "<p>Occurences of your Birthday:</p>";
var table = document.createElement("table");
var firstRow = table.insertRow();
var secondRow = table.insertRow();
array.forEach(function(dayOccurence, index) {
var dayNameCell = firstRow.insertCell(index);
dayNameCell.innerHTML = getDayName(index);
var nbCell = secondRow.insertCell(index);
nbCell.innerHTML = dayOccurence;
});
document.querySelector("#results").appendChild(table);
}
JS.Objects.Playing with Date: computing occurences of a birthday per day of the week
------------------------------------------------------------------------------------
A [Pen](https://codepen.io/Onlyforbopi/pen/dqxwGb) by [Pan Doul](https://codepen.io/Onlyforbopi) on [CodePen](https://codepen.io).
[License](https://codepen.io/Onlyforbopi/pen/dqxwGb/license).
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Compute day occurences of your birthday</title>
</head>
<body>
<label for="birthday">Your birthday: </label><input id="birthday" type="date" value="1965-04-16">
<p>Please enter a starting and an ending year, then click the button.</p>
<label for="start">Start year:</label>
<input type=number id="start" value=2017 min=1965 max=3000>
<p></p>
<label for="end">End year:</label>
<input type=number id="end" value=2047 min=1965 max=3000>
<p></p>
<button onclick="computeBirthdays();">
Compute how many times
your birthday will occur,
for each day of the week
</button>
<p></p>
<output id="results"></output>
</body>
</html>
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