This calculator helps you determine the pro rata holiday entitlement for an employee who has started or left employment partway through a holiday year. Pro rata means proportionally. It ensures that employees only receive holiday entitlement for the time they have actually worked within the holiday year.
function calculateProRataEntitlement() {
var annualEntitlement = parseFloat(document.getElementById("annualEntitlement").value);
var holidayYearDays = parseFloat(document.getElementById("holidayYearDays").value);
var startDateStr = document.getElementById("startDate").value;
var endDateStr = document.getElementById("endDate").value;
var resultDiv = document.getElementById("result");
resultDiv.innerHTML = ""; // Clear previous results
if (isNaN(annualEntitlement) || isNaN(holidayYearDays) || annualEntitlement <= 0 || holidayYearDays <= 0) {
resultDiv.innerHTML = "Please enter valid positive numbers for full annual entitlement and days in the holiday year.";
return;
}
if (!startDateStr) {
resultDiv.innerHTML = "Please enter the employment start date.";
return;
}
var startDate = new Date(startDateStr);
var today = new Date();
var endDate = endDateStr ? new Date(endDateStr) : today;
// Ensure dates are valid
if (isNaN(startDate.getTime())) {
resultDiv.innerHTML = "Please enter a valid start date.";
return;
}
if (endDateStr && isNaN(endDate.getTime())) {
resultDiv.innerHTML = "Please enter a valid end date.";
return;
}
// Determine the start and end of the holiday year.
// For simplicity, we assume the holiday year aligns with the calendar year.
// A more complex calculator might allow specifying the holiday year start/end.
var holidayYearStartDate = new Date(startDate.getFullYear(), 0, 1);
var holidayYearEndDate = new Date(startDate.getFullYear(), 11, 31);
// Adjust if the employee's start date is before the holiday year starts (less common for pro rata)
// or if the end date is after the holiday year ends.
var effectiveStartDate = startDate holidayYearEndDate ? holidayYearEndDate : endDate;
// Calculate the number of days the employee has worked within the holiday year.
var workDurationMs = effectiveEndDate.getTime() – effectiveStartDate.getTime();
var workDays = Math.ceil(workDurationMs / (1000 * 60 * 60 * 24)) + 1; // +1 to include both start and end days
// Ensure work days don't exceed the total holiday year days
if (workDays holidayYearDays) workDays = holidayYearDays;
// Calculate the pro rata entitlement
var proRataEntitlement = (annualEntitlement / holidayYearDays) * workDays;
// Round to a sensible number of decimal places, or whole days if preferred by policy.
// For now, we'll show a couple of decimal places.
var formattedEntitlement = proRataEntitlement.toFixed(2);
resultDiv.innerHTML = "Pro Rata Holiday Entitlement: " + formattedEntitlement + " days";
}
.form-group {
margin-bottom: 15px;
}
.form-group label {
display: block;
margin-bottom: 5px;
font-weight: bold;
}
.form-group input[type="number"],
.form-group input[type="date"] {
width: 200px;
padding: 8px;
border: 1px solid #ccc;
border-radius: 4px;
}
button {
padding: 10px 15px;
background-color: #007bff;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
}
button:hover {
background-color: #0056b3;
}