.time-clock-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: #fdfdfd;
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}
.time-clock-calculator-container h2 {
text-align: center;
color: #333;
margin-bottom: 25px;
font-size: 1.8em;
}
.time-clock-calculator-container .input-group {
margin-bottom: 18px;
display: flex;
flex-direction: column;
}
.time-clock-calculator-container label {
margin-bottom: 8px;
color: #555;
font-weight: bold;
font-size: 0.95em;
}
.time-clock-calculator-container input[type="text"],
.time-clock-calculator-container input[type="number"] {
width: calc(100% – 20px);
padding: 12px;
border: 1px solid #ccc;
border-radius: 6px;
font-size: 1em;
box-sizing: border-box;
transition: border-color 0.3s ease;
}
.time-clock-calculator-container input[type="text"]:focus,
.time-clock-calculator-container input[type="number"]:focus {
border-color: #007bff;
outline: none;
box-shadow: 0 0 5px rgba(0, 123, 255, 0.2);
}
.time-clock-calculator-container button {
width: 100%;
padding: 14px 20px;
background-color: #007bff;
color: white;
border: none;
border-radius: 6px;
font-size: 1.1em;
cursor: pointer;
transition: background-color 0.3s ease, transform 0.2s ease;
margin-top: 20px;
}
.time-clock-calculator-container button:hover {
background-color: #0056b3;
transform: translateY(-1px);
}
.time-clock-calculator-container .result {
margin-top: 30px;
padding: 18px;
border: 1px solid #d4edda;
background-color: #e9f7ef;
border-radius: 8px;
text-align: center;
font-size: 1.2em;
color: #155724;
font-weight: bold;
word-wrap: break-word;
}
.time-clock-calculator-container .error {
color: #dc3545;
background-color: #f8d7da;
border: 1px solid #f5c6cb;
padding: 10px;
border-radius: 5px;
margin-top: 15px;
text-align: center;
font-size: 0.95em;
}
.time-clock-calculator-container p {
line-height: 1.6;
color: #444;
margin-bottom: 15px;
}
.time-clock-calculator-container h3 {
color: #333;
margin-top: 30px;
margin-bottom: 15px;
font-size: 1.5em;
}
.time-clock-calculator-container ul {
list-style-type: disc;
margin-left: 20px;
margin-bottom: 15px;
color: #444;
}
.time-clock-calculator-container ul li {
margin-bottom: 8px;
}
function parseTime(timeStr) {
var parts = timeStr.match(/(\d{1,2}):(\d{2})\s*(AM|PM)/i);
if (!parts) {
return null; // Invalid format
}
var hours = parseInt(parts[1], 10);
var minutes = parseInt(parts[2], 10);
var ampm = parts[3].toUpperCase();
if (ampm === 'PM' && hours < 12) {
hours += 12;
}
if (ampm === 'AM' && hours === 12) { // 12 AM is midnight (0 hours)
hours = 0;
}
return { hours: hours, minutes: minutes };
}
function calculateTotalHours() {
var startTimeStr = document.getElementById("startTime").value.trim();
var endTimeStr = document.getElementById("endTime").value.trim();
var breakMinutesStr = document.getElementById("breakMinutes").value.trim();
var resultDiv = document.getElementById("result");
var errorDiv = document.getElementById("error");
resultDiv.style.display = 'none';
errorDiv.style.display = 'none';
errorDiv.innerHTML = '';
var parsedStartTime = parseTime(startTimeStr);
var parsedEndTime = parseTime(endTimeStr);
var breakMinutes = parseFloat(breakMinutesStr);
if (!parsedStartTime) {
errorDiv.innerHTML = "Invalid Start Time format. Please use HH:MM AM/PM (e.g., 9:00 AM).";
errorDiv.style.display = 'block';
return;
}
if (!parsedEndTime) {
errorDiv.innerHTML = "Invalid End Time format. Please use HH:MM AM/PM (e.g., 5:30 PM).";
errorDiv.style.display = 'block';
return;
}
if (isNaN(breakMinutes) || breakMinutes < 0) {
errorDiv.innerHTML = "Break Duration must be a non-negative number.";
errorDiv.style.display = 'block';
return;
}
var today = new Date();
var startDateTime = new Date(today.getFullYear(), today.getMonth(), today.getDate(), parsedStartTime.hours, parsedStartTime.minutes, 0);
var endDateTime = new Date(today.getFullYear(), today.getMonth(), today.getDate(), parsedEndTime.hours, parsedEndTime.minutes, 0);
// Handle overnight shifts (e.g., 10 PM to 6 AM)
if (endDateTime < startDateTime) {
endDateTime.setDate(endDateTime.getDate() + 1);
}
var totalDurationMs = endDateTime.getTime() – startDateTime.getTime();
var breakMs = breakMinutes * 60 * 1000;
var netDurationMs = totalDurationMs – breakMs;
if (netDurationMs < 0) {
errorDiv.innerHTML = "Break duration is longer than the total shift duration. Please check your inputs.";
errorDiv.style.display = 'block';
return;
}
var totalMinutes = Math.floor(netDurationMs / (1000 * 60));
var hours = Math.floor(totalMinutes / 60);
var minutes = totalMinutes % 60;
resultDiv.innerHTML = "Total Hours Worked: " + hours + " hours and " + minutes + " minutes";
resultDiv.style.display = 'block';
}
Time Clock Calculator
What is a Time Clock Calculator?
A Time Clock Calculator is an essential online tool designed to help individuals and businesses accurately track and calculate the total hours worked during a specific period. Whether you're an employee needing to verify your hours, a freelancer managing multiple projects, or a small business owner preparing payroll, this calculator simplifies the process of converting start and end times into a precise total, accounting for breaks.
How Does This Calculator Work?
Our Free Online Time Clock Calculator takes three simple inputs:
- Shift Start Time: The exact time your work period began (e.g., 9:00 AM).
- Shift End Time: The exact time your work period concluded (e.g., 5:30 PM).
- Total Break Duration: The total time spent on breaks during your shift, specified in minutes (e.g., 30 minutes for a lunch break).
Once you provide these details, the calculator performs the following steps:
- It determines the gross duration between your start and end times.
- It intelligently handles shifts that cross midnight (e.g., working from 10 PM to 6 AM the next day).
- It subtracts the specified break duration from the gross work time.
- Finally, it presents your net total working hours in an easy-to-understand format (e.g., "8 hours and 30 minutes").
Why Use a Time Clock Calculator?
- Accuracy: Eliminate manual calculation errors that can lead to incorrect pay or time tracking.
- Payroll Preparation: Businesses can quickly verify employee hours for accurate payroll processing, ensuring compliance and fairness.
- Personal Time Management: Employees can easily track their own hours, ensuring they are paid correctly and helping them manage their work-life balance.
- Freelancer Billing: Freelancers can precisely calculate billable hours for clients, fostering transparency and trust.
- Overtime Calculation: While this calculator focuses on total hours, accurate base hour calculation is the first step towards determining overtime eligibility.
Example Usage:
Let's say an employee works from 8:30 AM to 5:00 PM and takes a 45-minute lunch break.
- Shift Start Time: 8:30 AM
- Shift End Time: 5:00 PM
- Total Break Duration: 45 minutes
Using the calculator:
- Gross time from 8:30 AM to 5:00 PM is 8 hours and 30 minutes.
- Subtracting the 45-minute break: 8 hours 30 minutes – 45 minutes = 7 hours 45 minutes.
The calculator would display: Total Hours Worked: 7 hours and 45 minutes.
Another example: An employee works an overnight shift from 10:00 PM to 6:00 AM the next day, with a 30-minute break.
- Shift Start Time: 10:00 PM
- Shift End Time: 6:00 AM
- Total Break Duration: 30 minutes
The calculator would correctly identify this as an overnight shift:
- Gross time from 10:00 PM to 6:00 AM is 8 hours.
- Subtracting the 30-minute break: 8 hours – 30 minutes = 7 hours 30 minutes.
The calculator would display: Total Hours Worked: 7 hours and 30 minutes.