.time-duration-calculator-container {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
max-width: 700px;
margin: 20px auto;
padding: 25px;
border: 1px solid #e0e0e0;
border-radius: 10px;
background-color: #f9f9f9;
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}
.time-duration-calculator-container h2 {
color: #333;
text-align: center;
margin-bottom: 25px;
font-size: 28px;
font-weight: 600;
}
.time-duration-calculator-container .input-group {
margin-bottom: 18px;
display: flex;
flex-wrap: wrap;
align-items: center;
gap: 10px;
}
.time-duration-calculator-container .input-group label {
flex: 1 1 100px;
color: #555;
font-weight: 500;
font-size: 16px;
}
.time-duration-calculator-container .input-group input[type="number"] {
flex: 2 1 150px;
padding: 12px 15px;
border: 1px solid #ccc;
border-radius: 6px;
font-size: 16px;
color: #333;
box-sizing: border-box;
transition: border-color 0.3s ease;
}
.time-duration-calculator-container .input-group input[type="number"]:focus {
border-color: #007bff;
outline: none;
box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}
.time-duration-calculator-container button {
display: block;
width: 100%;
padding: 14px 20px;
background-color: #007bff;
color: white;
border: none;
border-radius: 6px;
font-size: 18px;
font-weight: 600;
cursor: pointer;
transition: background-color 0.3s ease, transform 0.2s ease;
margin-top: 25px;
}
.time-duration-calculator-container button:hover {
background-color: #0056b3;
transform: translateY(-1px);
}
.time-duration-calculator-container #result {
margin-top: 25px;
padding: 18px;
border: 1px solid #d4edda;
background-color: #e2f0e5;
border-radius: 8px;
font-size: 18px;
color: #155724;
text-align: center;
font-weight: 600;
word-wrap: break-word;
}
.time-duration-calculator-container #result.error {
border-color: #f5c6cb;
background-color: #f8d7da;
color: #721c24;
}
.time-duration-calculator-container .time-input-pair {
display: flex;
gap: 10px;
flex: 2 1 300px; /* Allow it to take more space */
}
.time-duration-calculator-container .time-input-pair input {
flex: 1;
min-width: 0; /* Allow shrinking */
}
@media (max-width: 600px) {
.time-duration-calculator-container .input-group {
flex-direction: column;
align-items: stretch;
}
.time-duration-calculator-container .input-group label {
margin-bottom: 5px;
}
.time-duration-calculator-container .time-input-pair {
flex-direction: row; /* Keep hour and minute side-by-side */
}
}
function calculateTimeDuration() {
var startHourInput = document.getElementById("startHour").value;
var startMinuteInput = document.getElementById("startMinute").value;
var endHourInput = document.getElementById("endHour").value;
var endMinuteInput = document.getElementById("endMinute").value;
var resultDiv = document.getElementById("result");
// Validate inputs
if (startHourInput === "" || startMinuteInput === "" || endHourInput === "" || endMinuteInput === "") {
resultDiv.innerHTML = "Please fill in all time fields.";
resultDiv.className = "error";
return;
}
var startHour = parseInt(startHourInput);
var startMinute = parseInt(startMinuteInput);
var endHour = parseInt(endHourInput);
var endMinute = parseInt(endMinuteInput);
if (isNaN(startHour) || isNaN(startMinute) || isNaN(endHour) || isNaN(endMinute)) {
resultDiv.innerHTML = "Please enter valid numbers for all time fields.";
resultDiv.className = "error";
return;
}
if (startHour 23 || endHour 23) {
resultDiv.innerHTML = "Hours must be between 0 and 23.";
resultDiv.className = "error";
return;
}
if (startMinute 59 || endMinute 59) {
resultDiv.innerHTML = "Minutes must be between 0 and 59.";
resultDiv.className = "error";
return;
}
// Convert all times to minutes from midnight
var totalStartMinutes = (startHour * 60) + startMinute;
var totalEndMinutes = (endHour * 60) + endMinute;
var durationMinutes;
// Handle overnight scenarios (end time is on the next day)
if (totalEndMinutes < totalStartMinutes) {
// Add 24 hours (1440 minutes) to the end time to account for the next day
durationMinutes = (totalEndMinutes + (24 * 60)) – totalStartMinutes;
} else {
durationMinutes = totalEndMinutes – totalStartMinutes;
}
var totalHours = durationMinutes / 60;
var wholeHours = Math.floor(totalHours);
var remainingMinutes = durationMinutes % 60;
resultDiv.innerHTML = "
" + totalHours.toFixed(2) + " hours (" + wholeHours + " hours and " + remainingMinutes + " minutes)";
resultDiv.className = ""; // Clear error class if any
}
Understanding the Time Duration Calculator
The Time Duration Calculator is a practical tool designed to help you quickly determine the exact time difference between a start time and an end time. Whether you're tracking work hours, planning events, managing projects, or simply curious about the length of a specific period, this calculator simplifies the process.
How It Works
This calculator uses a 24-hour clock format (also known as military time) for input, which eliminates the ambiguity of AM/PM. Here's a quick guide:
- Hours (0-23): 0 is midnight, 12 is noon, 13 is 1 PM, 17 is 5 PM, 23 is 11 PM.
- Minutes (0-59): Standard minutes.
To calculate the duration, the tool converts both the start and end times into a total number of minutes from midnight. It then subtracts the start minutes from the end minutes to find the total duration in minutes. Finally, this minute duration is converted into hours and minutes for a clear, easy-to-understand result.
Handling Overnight Durations
A key feature of this calculator is its ability to correctly calculate durations that span across midnight. For instance, if your start time is 10 PM (22:00) and your end time is 2 AM (02:00), the calculator intelligently recognizes that the end time is on the following day. It adjusts the calculation to accurately reflect the duration, in this case, 4 hours.
Practical Applications
- Workforce Management: Calculate employee shift durations for payroll or time tracking.
- Project Planning: Determine the length of tasks or project phases.
- Event Scheduling: Figure out the total time for meetings, webinars, or social events.
- Personal Productivity: Track how long you spend on various activities throughout your day.
- Travel Planning: Estimate travel times between different time points.
Example Calculation
Let's say you start work at 9:00 AM (09:00) and finish at 5:30 PM (17:30).
- Start Time: 09 hours, 00 minutes
- End Time: 17 hours, 30 minutes
- The calculator converts 09:00 to 540 minutes from midnight (9 * 60 + 0).
- It converts 17:30 to 1050 minutes from midnight (17 * 60 + 30).
- The difference is 1050 – 540 = 510 minutes.
- Converting 510 minutes to hours: 510 / 60 = 8.5 hours.
- The result will be displayed as: 8.50 hours (8 hours and 30 minutes).
Using the Time Duration Calculator ensures accuracy and saves you the hassle of manual time calculations, especially when dealing with complex schedules or overnight shifts.