.hour-calculator-container {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
max-width: 600px;
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);
}
.hour-calculator-container h2 {
text-align: center;
color: #333;
margin-bottom: 25px;
font-size: 28px;
}
.hour-calculator-container .input-group {
margin-bottom: 18px;
display: flex;
flex-wrap: wrap;
align-items: center;
gap: 10px;
}
.hour-calculator-container .input-group label {
flex: 1 1 100px;
color: #555;
font-weight: 600;
font-size: 16px;
}
.hour-calculator-container .input-group input[type="number"] {
flex: 2 1 120px;
padding: 12px;
border: 1px solid #ccc;
border-radius: 6px;
font-size: 16px;
box-sizing: border-box;
transition: border-color 0.3s ease;
}
.hour-calculator-container .input-group input[type="number"]:focus {
border-color: #007bff;
outline: none;
box-shadow: 0 0 5px rgba(0, 123, 255, 0.3);
}
.hour-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: 700;
cursor: pointer;
transition: background-color 0.3s ease, transform 0.2s ease;
margin-top: 25px;
}
.hour-calculator-container button:hover {
background-color: #0056b3;
transform: translateY(-2px);
}
.hour-calculator-container #result {
margin-top: 30px;
padding: 20px;
border: 1px solid #d4edda;
background-color: #e9f7ef;
border-radius: 8px;
font-size: 20px;
font-weight: 700;
color: #155724;
text-align: center;
word-wrap: break-word;
line-height: 1.5;
}
.hour-calculator-container #result.error {
border-color: #f5c6cb;
background-color: #f8d7da;
color: #721c24;
}
@media (max-width: 480px) {
.hour-calculator-container {
padding: 15px;
}
.hour-calculator-container h2 {
font-size: 24px;
}
.hour-calculator-container .input-group label,
.hour-calculator-container .input-group input[type="number"] {
flex: 1 1 100%;
}
.hour-calculator-container button {
font-size: 16px;
padding: 12px 15px;
}
.hour-calculator-container #result {
font-size: 18px;
padding: 15px;
}
}
Time Duration Calculator
Enter your start and end times to calculate the duration.
function calculateTimeDuration() {
var startHour = parseFloat(document.getElementById("startHour").value);
var startMinute = parseFloat(document.getElementById("startMinute").value);
var endHour = parseFloat(document.getElementById("endHour").value);
var endMinute = parseFloat(document.getElementById("endMinute").value);
var resultDiv = document.getElementById("result");
// Input validation
if (isNaN(startHour) || isNaN(startMinute) || isNaN(endHour) || isNaN(endMinute) ||
startHour 23 ||
startMinute 59 ||
endHour 23 ||
endMinute 59) {
resultDiv.innerHTML = "Please enter valid hours (0-23) and minutes (0-59).";
resultDiv.className = "error";
return;
}
var startTotalMinutes = (startHour * 60) + startMinute;
var endTotalMinutes = (endHour * 60) + endMinute;
var durationMinutes = endTotalMinutes – startTotalMinutes;
// Handle overnight duration (e.g., 10 PM to 2 AM)
if (durationMinutes < 0) {
durationMinutes += (24 * 60); // Add 24 hours in minutes
}
var totalHours = Math.floor(durationMinutes / 60);
var remainingMinutes = durationMinutes % 60;
resultDiv.innerHTML = "The duration is: " + totalHours + " hours and " + remainingMinutes + " minutes.";
resultDiv.className = ""; // Clear error class if any
}
Understanding the Time Duration Calculator
The Time Duration Calculator is a simple yet powerful tool designed to help you quickly determine the elapsed time between a specified start time and an end time. Whether you're tracking work hours, planning project timelines, calculating travel duration, or simply managing your daily schedule, this calculator provides an accurate and easy way to find the difference.
How It Works
This calculator takes four inputs: the start hour, start minute, end hour, and end minute. It then performs the following steps:
- Convert to Total Minutes: Both the start and end times are converted into a total number of minutes from midnight (00:00). For example, 9:00 AM becomes 540 minutes (9 * 60), and 5:30 PM (17:30 in 24-hour format) becomes 1050 minutes (17 * 60 + 30).
- Calculate Difference: The total minutes of the start time are subtracted from the total minutes of the end time.
- Handle Overnight Durations: A crucial feature of this calculator is its ability to correctly calculate durations that span across midnight. If the end time is numerically smaller than the start time (e.g., starting at 10 PM and ending at 2 AM), it automatically adds 24 hours (1440 minutes) to the end time's total minutes before calculating the difference. This ensures accurate results for shifts or events that cross into the next day.
- Convert Back to Hours and Minutes: The final duration, expressed in total minutes, is then converted back into a more readable format of hours and minutes.
Why Use a Time Duration Calculator?
- Workforce Management: Easily calculate employee work hours, overtime, or project task durations.
- Event Planning: Determine the exact length of meetings, conferences, or social events.
- Travel Planning: Figure out the duration of a journey from departure to arrival.
- Personal Scheduling: Track how long you spend on various activities, hobbies, or studies.
- Billing and Invoicing: Accurately charge clients based on time spent on projects.
Examples of Use:
Let's look at a couple of practical examples:
Example 1: A Standard Work Shift
- Start Time: 9:00 AM (Input: Start Hour = 9, Start Minute = 0)
- End Time: 5:30 PM (Input: End Hour = 17, End Minute = 30)
- Calculation:
- Start total minutes: (9 * 60) + 0 = 540 minutes
- End total minutes: (17 * 60) + 30 = 1050 minutes
- Duration: 1050 – 540 = 510 minutes
- Converted: 510 minutes = 8 hours and 30 minutes
- Result: 8 hours and 30 minutes
Example 2: An Overnight Shift
- Start Time: 10:00 PM (Input: Start Hour = 22, Start Minute = 0)
- End Time: 2:15 AM (Input: End Hour = 2, End Minute = 15)
- Calculation:
- Start total minutes: (22 * 60) + 0 = 1320 minutes
- End total minutes: (2 * 60) + 15 = 135 minutes
- Initial Duration: 135 – 1320 = -1185 minutes
- Adjusted for overnight: -1185 + (24 * 60) = -1185 + 1440 = 255 minutes
- Converted: 255 minutes = 4 hours and 15 minutes
- Result: 4 hours and 15 minutes
This calculator simplifies time calculations, eliminating the need for manual conversions and potential errors, especially when dealing with times that cross midnight.