How do I get the number of days between two dates in JavaScript
let today = new Date().toISOString().slice(0, 10)
const startDate = '2021-04-15';
const endDate = today;
const diffInMs = new Date(endDate) - new Date(startDate)
const diffInDays = diffInMs / (1000 * 60 * 60 * 24);
alert( diffInDays );how to get the number of days in a month in javascript
// instantiate a date object
var dt = new Date();
// dt.getMonth() will return a month between 0 - 11
// we add one to get to the last day of the month
// so that when getDate() is called it will return the last day of the month
var month = dt.getMonth() + 1;
var year = dt.getFullYear();
// this line does the magic (in collab with the lines above)
var daysInMonth = new Date(year, month, 0).getDate();Copyright © 2021 Codeinu
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