Hours Time Calculator
body {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
background-color: #f8f9fa;
color: #333;
line-height: 1.6;
margin: 0;
padding: 20px;
}
.calculator-container {
max-width: 700px;
margin: 40px auto;
background-color: #ffffff;
border-radius: 8px;
box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
padding: 30px;
border: 1px solid #e0e0e0;
}
h1, h2 {
color: #004a99;
text-align: center;
margin-bottom: 20px;
}
.input-group {
margin-bottom: 20px;
display: flex;
align-items: center;
gap: 15px;
flex-wrap: wrap;
}
.input-group label {
display: block;
margin-bottom: 5px;
font-weight: 500;
flex: 1;
min-width: 150px;
}
.input-group input[type="number"],
.input-group select {
padding: 10px 15px;
border: 1px solid #ccc;
border-radius: 5px;
font-size: 1rem;
flex: 2;
min-width: 180px;
box-sizing: border-box;
}
.input-group input[type="number"]:focus,
.input-group select:focus {
border-color: #004a99;
outline: none;
box-shadow: 0 0 0 3px rgba(0, 74, 153, 0.2);
}
button {
display: block;
width: 100%;
padding: 12px 20px;
background-color: #004a99;
color: white;
border: none;
border-radius: 5px;
font-size: 1.1rem;
cursor: pointer;
transition: background-color 0.3s ease, transform 0.2s ease;
margin-top: 20px;
}
button:hover {
background-color: #003366;
transform: translateY(-2px);
}
#result {
margin-top: 30px;
padding: 20px;
background-color: #e7f3ff;
border-left: 5px solid #004a99;
border-radius: 5px;
text-align: center;
font-size: 1.4rem;
font-weight: bold;
color: #004a99;
}
#result span {
font-size: 1.8rem;
color: #28a745;
}
.explanation {
margin-top: 50px;
padding: 30px;
background-color: #ffffff;
border-radius: 8px;
box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
border: 1px solid #e0e0e0;
}
.explanation h2 {
text-align: left;
margin-bottom: 15px;
}
.explanation p, .explanation ul {
margin-bottom: 15px;
}
.explanation code {
background-color: #eef2f7;
padding: 2px 5px;
border-radius: 3px;
font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
}
@media (max-width: 600px) {
.input-group {
flex-direction: column;
align-items: stretch;
}
.input-group label {
margin-bottom: 8px;
}
.input-group input[type="number"],
.input-group select {
width: 100%;
min-width: unset;
}
.calculator-container {
padding: 20px;
}
h1 {
font-size: 1.8rem;
}
}
Hours Time Calculator
Calculate the total duration between two times, or sum multiple time durations.
Understanding the Hours Time Calculator
This calculator is designed to handle two primary time-related calculations:
Time Difference: Calculating the duration between a start time and an end time.Duration Summation: Adding up multiple time durations (e.g., project task times, work shifts).
How the Time Difference Works
To calculate the difference between two times (e.g., 9:00 AM and 5:30 PM), the calculator converts both times into minutes from midnight. The difference in minutes is then calculated. Finally, this total minute difference is converted back into hours and minutes for a clear result. For example:
Start Time: 09:00
End Time: 17:30
Convert to minutes: 09:00 = (9 * 60) + 0 = 540 minutes. 17:30 = (17 * 60) + 30 = 1050 minutes.
Calculate difference: 1050 minutes – 540 minutes = 510 minutes.
Convert back to HH:MM: 510 minutes / 60 minutes/hour = 8 hours with a remainder of 30 minutes. So, the duration is 8 hours and 30 minutes.
The calculator handles cases where the end time is on the next day (e.g., from 10 PM to 2 AM) by recognizing that if the end time's minutes are less than the start time's minutes, it implies crossing midnight. In such cases, it adds 24 hours (1440 minutes) to the end time's total minutes before calculating the difference.
How Duration Summation Works
When summing multiple durations, each duration (expressed in hours and minutes) is converted into total minutes. These total minutes are then added together. Finally, the grand total of minutes is converted back into a standard HH:MM format. For instance:
Duration 1: 2 hours 30 minutes = (2 * 60) + 30 = 150 minutes.
Duration 2: 1 hour 45 minutes = (1 * 60) + 45 = 105 minutes.
Total minutes: 150 + 105 = 255 minutes.
Convert back to HH:MM: 255 minutes / 60 minutes/hour = 4 hours with a remainder of 15 minutes. The total duration is 4 hours and 15 minutes.
This is useful for tasks like calculating total project time, summing up employee work hours across shifts, or estimating combined event durations.
var durationCounter = 1;
function parseTimeInput(timeString) {
if (!timeString) return { hours: 0, minutes: 0 };
var parts = timeString.split(':');
var hours = parseInt(parts[0], 10);
var minutes = parseInt(parts[1], 10);
return { hours: isNaN(hours) ? 0 : hours, minutes: isNaN(minutes) ? 0 : minutes };
}
function formatTime(totalMinutes) {
if (isNaN(totalMinutes) || totalMinutes = startTotalMinutes) {
differenceMinutes = endTotalMinutes – startTotalMinutes;
} else {
// End time is on the next day
differenceMinutes = (24 * 60 – startTotalMinutes) + endTotalMinutes;
}
var resultDiv = document.getElementById('differenceResult');
if (isNaN(differenceMinutes)) {
resultDiv.innerHTML = "Please enter valid times.";
} else {
resultDiv.innerHTML = "Time Difference:
" + formatTime(differenceMinutes) + " ";
}
}
function addDurationField() {
durationCounter++;
var newDurationDiv = document.createElement('div');
newDurationDiv.className = 'input-group';
newDurationDiv.innerHTML =
'
Duration ' + durationCounter + ' (Hours): ' +
" +
'
Minutes: ' +
";
document.getElementById('durationInputs').appendChild(newDurationDiv);
}
function calculateTotalDuration() {
var totalMinutes = 0;
var inputGroups = document.querySelectorAll('#durationInputs .input-group');
for (var i = 0; i = 0 && !isNaN(minutes) && minutes >= 0 && minutes <= 59) {
totalMinutes += (hours * 60) + minutes;
} else {
// Handle invalid input for this specific duration field
// Optionally clear the result or show a specific error message
}
}
var resultDiv = document.getElementById('totalDurationResult');
if (isNaN(totalMinutes)) {
resultDiv.innerHTML = "Please enter valid durations.";
} else {
resultDiv.innerHTML = "Total Duration:
" + formatTime(totalMinutes) + " ";
}
}