Are you looking to create a web application that will tell your visitors how many days until Christmas when they click a button? There are several languages that you can use to do this. One of the easiest languages is JavaScript, but you can also try doing this in Python. This article has programs in both languages that do this.
How to do it in Python
from flask import Flask, render_template
from datetime import datetime
app = Flask(name)
def days_until_christmas():
today = datetime.today()
christmas = datetime(today.year, 12, 25)
if today > christmas:
christmas = christmas.replace(year=today.year + 1)
days_left = (christmas – today).days
return days_left
@app.route(‘/’)
def index():
return render_template(‘index.html’, days_until_christmas=days_until_christmas())
if name == ‘main‘:
app.run(debug=True)
If you want to change the code to display in the months and days format instead of just days, then you can tweak it like this:
from flask import Flask, render_template
from datetime import datetime
app = Flask(name)
Calculate the remaining time until Christmas in months and days
def remaining_time_until_christmas():
today = datetime.today()
christmas = datetime(today.year, 12, 25)
if today > christmas:
christmas = christmas.replace(year=today.year + 1)
time_diff = christmas – today
months = time_diff.days // 30
days = time_diff.days % 30
return months, days
@app.route(‘/’)
def index():
months, days = remaining_time_until_christmas()
return render_template(‘index.html’, months=months, days=days)
if name == ‘main‘:
app.run(debug=True)
Here is the HTML template to make the program work:
<!DOCTYPE html> <html lang=”en”>
<head>
<meta charset=”UTF-8″> <meta name=”viewport” content=”width=device-width, initial-scale=1.0″> <title>Days Until Christmas</title> </head>
<body> <h1>Days Until Christmas: <span id=”days”></span></h1> <button onclick=”getDaysUntilChristmas()”>Calculate</button> <script> function getDaysUntilChristmas() { fetch(‘/’) .then(response => response.text()) .then(data => { const days = document.getElementById(‘days’); days.innerText = data; }); }
</script> </body> </html>*
How to Do it in JavaScript
Here is a script that accomplishes the same thing with JavaScript. The benefit here is that it doesn’t require a backend solution like Flask.
<script>
document.getElementById("calculateButton").addEventListener("click", function() {
getDaysUntilChristmas();
});
function getDaysUntilChristmas() {
// Get today's date
var today = new Date();
// Calculate Christmas date for the current year
var christmas = new Date(today.getFullYear(), 11, 25);
// If Christmas has passed for this year, calculate for next year
if (today.getTime() > christmas.getTime()) {
christmas.setFullYear(today.getFullYear() + 1);
}
// Calculate the difference in days
var timeDiff = christmas.getTime() - today.getTime();
var daysDiff = Math.ceil(timeDiff / (1000 * 3600 * 24));
// Update the HTML with the number of days until Christmas
document.getElementById("days").innerText = daysDiff;
}
</script>If you want to change the code to display in the months and days format instead of just days, then you can tweak it like this:
<script>
document.getElementById("calculateButton").addEventListener("click", function() {
getRemainingTime();
});
function getRemainingTime() {
// Get today's date
var today = new Date();
// Calculate Christmas date for the current year
var christmas = new Date(today.getFullYear(), 11, 25);
// If Christmas has passed for this year, calculate for next year
if (today.getTime() > christmas.getTime()) {
christmas.setFullYear(today.getFullYear() + 1);
}
// Calculate the difference in milliseconds
var timeDiff = christmas.getTime() - today.getTime();
// Calculate months and days remaining
var months = Math.floor(timeDiff / (1000 * 60 * 60 * 24 * 30));
var days = Math.floor((timeDiff % (1000 * 60 * 60 * 24 * 30)) / (1000 * 60 * 60 * 24));
// Update the HTML with the time until Christmas
document.getElementById("time").innerText = months + " months and " + days + " days";
}
</script>Can You Do the Same Thing with Other Major Events?
Yes. You can create a number of other programmers that will calculate how many days until another holiday or major event. We intend to come up with some more programs like this in the future. This can be great if you want to come up with a blog article that helps people make these calculations to plan for these events more easily.