Use this calculator to determine the elapsed time since your Certificate of Deposit (CD) was opened and the remaining time until it reaches its maturity date.
function calculateCDAge() {
var openDateStr = document.getElementById('cdOpenDate').value;
var termYears = parseInt(document.getElementById('cdTermYears').value);
var termMonths = parseInt(document.getElementById('cdTermMonths').value);
var resultDiv = document.getElementById('cdAgeResult');
// Input validation
if (!openDateStr) {
resultDiv.innerHTML = "Please enter the CD Open Date.";
return;
}
var openDate = new Date(openDateStr);
// Normalize openDate to start of day for consistent calculations
openDate.setHours(0, 0, 0, 0);
if (isNaN(openDate.getTime())) {
resultDiv.innerHTML = "Invalid CD Open Date. Please use a valid date format.";
return;
}
if (isNaN(termYears) || termYears < 0) {
termYears = 0; // Default to 0 if invalid
document.getElementById('cdTermYears').value = 0;
}
if (isNaN(termMonths) || termMonths < 0) {
termMonths = 0; // Default to 0 if invalid
document.getElementById('cdTermMonths').value = 0;
}
var currentDate = new Date();
currentDate.setHours(0, 0, 0, 0); // Normalize current date to start of day for accurate comparison
// — Calculate CD Age (Time Since Opening) —
var cdAgeOutput = "CD Age (Time Since Opening): ";
if (openDate.getTime() > currentDate.getTime()) {
cdAgeOutput += "CD opening date is in the future. Please check the date.";
} else {
var ageDiff = getDateDiff(openDate, currentDate);
cdAgeOutput += ageDiff.years + " years, " + ageDiff.months + " months, and " + ageDiff.days + " days.";
}
// — Calculate Maturity Date and Time Until Maturity —
var maturityDate = new Date(openDate);
maturityDate.setFullYear(maturityDate.getFullYear() + termYears);
maturityDate.setMonth(maturityDate.getMonth() + termMonths);
// setMonth automatically handles month overflow (e.g., adding 13 months to Jan results in Feb of next year)
// It also handles day overflow (e.g., Jan 31 + 1 month -> Feb 28/29)
var maturityDateFormatted = maturityDate.toLocaleDateString('en-US', { year: 'numeric', month: 'long', day: 'numeric' });
var timeUntilMaturityOutput = "Time Until Maturity: ";
if (maturityDate.getTime() <= currentDate.getTime()) {
timeUntilMaturityOutput += "This CD matured on " + maturityDateFormatted + ".";
} else {
var maturityDiff = getDateDiff(currentDate, maturityDate);
timeUntilMaturityOutput += maturityDiff.years + " years, " + maturityDiff.months + " months, and " + maturityDiff.days + " days (on " + maturityDateFormatted + ").";
}
resultDiv.innerHTML = "" + cdAgeOutput + "" + timeUntilMaturityOutput + "";
}
// Helper function to calculate difference between two dates in years, months, days
// d1 is the earlier date, d2 is the later date
function getDateDiff(d1, d2) {
var years = d2.getFullYear() – d1.getFullYear();
var months = d2.getMonth() – d1.getMonth();
var days = d2.getDate() – d1.getDate();
if (days < 0) {
months–;
// Get the number of days in the previous month of d2
var prevMonth = new Date(d2.getFullYear(), d2.getMonth(), 0);
days += prevMonth.getDate();
}
if (months < 0) {
years–;
months += 12;
}
return { years: years, months: months, days: days };
}
// Set default date to today for convenience and calculate on load
window.onload = function() {
var today = new Date();
var dd = String(today.getDate()).padStart(2, '0');
var mm = String(today.getMonth() + 1).padStart(2, '0'); //January is 0!
var yyyy = today.getFullYear();
document.getElementById('cdOpenDate').value = yyyy + '-' + mm + '-' + dd;
calculateCDAge(); // Calculate on load with default values
};
.calculator-container {
background-color: #f9f9f9;
border: 1px solid #ddd;
padding: 20px;
border-radius: 8px;
max-width: 600px;
margin: 20px auto;
font-family: Arial, sans-serif;
}
.calculator-container h2 {
color: #333;
text-align: center;
margin-bottom: 20px;
}
.calculator-container p {
color: #555;
line-height: 1.6;
}
.calc-input-group {
margin-bottom: 15px;
}
.calc-input-group label {
display: block;
margin-bottom: 5px;
color: #333;
font-weight: bold;
}
.calc-input-group input[type="date"],
.calc-input-group input[type="number"] {
width: calc(100% – 22px);
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box;
}
.calculator-container button {
background-color: #007bff;
color: white;
padding: 12px 20px;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
width: 100%;
margin-top: 10px;
}
.calculator-container button:hover {
background-color: #0056b3;
}
.calc-result {
background-color: #e9f7ef;
border: 1px solid #d4edda;
padding: 15px;
border-radius: 4px;
margin-top: 20px;
color: #155724;
}
.calc-result p {
margin: 0 0 5px 0;
}
.calc-result p:last-child {
margin-bottom: 0;
}
Understanding Your Certificate of Deposit (CD)
A Certificate of Deposit (CD) is a type of savings account that holds a fixed amount of money for a fixed period of time, and in return, the issuing bank or credit union pays you interest. Unlike a regular savings account, you typically cannot withdraw the money from a CD until the term ends without incurring a penalty. CDs are generally considered low-risk investments because they are FDIC-insured (up to limits) and offer a predictable return.
Why Track CD Age and Maturity?
Keeping tabs on the age and maturity of your CDs is crucial for effective financial planning. Here's why:
Avoid Early Withdrawal Penalties: Knowing your CD's maturity date helps you plan your finances so you don't need to access the funds prematurely, thus avoiding potential penalties that can eat into your earnings.
Plan for Reinvestment: As a CD approaches maturity, you'll need to decide whether to withdraw the funds, roll them over into a new CD (perhaps with a different term or rate), or invest them elsewhere. Our calculator helps you anticipate this decision point.
CD Laddering Strategies: Many investors use a "CD ladder" strategy, where they stagger the maturity dates of multiple CDs. This calculator can be invaluable for managing such a strategy, ensuring you always have funds maturing at regular intervals.
Track Investment Progress: Simply knowing how long your money has been working for you in a CD can be satisfying and help you understand the duration of your commitment.
How Our CD Age Calculator Works
Our Certificate of Deposit Age Calculator simplifies the process of tracking your CD's lifecycle. You only need to provide two pieces of information:
CD Open Date: The exact date you opened or funded your Certificate of Deposit.
CD Term Length (Years and Months): The agreed-upon duration for which your funds are locked into the CD. This is typically specified in months (e.g., 6 months, 12 months, 18 months) or years (e.g., 1 year, 3 years, 5 years).
Based on these inputs, the calculator will instantly provide you with two key metrics:
CD Age (Time Since Opening): This tells you exactly how many years, months, and days have passed since your CD was first opened.
Time Until Maturity: This indicates how many years, months, and days are remaining until your CD reaches its full term. If the CD has already matured, it will tell you the maturity date.
Using the Calculator: Examples
Let's look at a few realistic scenarios:
Example 1: A Recently Opened CD
CD Open Date: January 15, 2024
CD Term Length: 1 Year, 0 Months
If today's date is October 26, 2024, the calculator would show:
CD Age: 9 months, 11 days.
Time Until Maturity: 2 months, 20 days (on January 15, 2025).
Example 2: A Long-Term CD Approaching Maturity
CD Open Date: March 1, 2020
CD Term Length: 5 Years, 0 Months
If today's date is October 26, 2024, the calculator would show:
CD Age: 4 years, 7 months, 25 days.
Time Until Maturity: 4 months, 5 days (on March 1, 2025).
Example 3: A Matured CD
CD Open Date: July 1, 2022
CD Term Length: 1 Year, 6 Months
If today's date is October 26, 2024, the calculator would show:
CD Age: 2 years, 3 months, 25 days.
Time Until Maturity: This CD matured on January 1, 2024.
By utilizing this simple tool, you can stay informed about your CD investments and make timely, informed decisions about your savings strategy.