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assets/js/dateUtils.js

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+function calculateDuration(startDate, endDate) {
+  const start = new Date(startDate);
+  const end = endDate ? new Date(endDate) : new Date();
+
+  const years = end.getFullYear() - start.getFullYear();
+  const months = end.getMonth() - start.getMonth();
+
+  let totalMonths = years * 12 + months;
+  if (end.getDate() < start.getDate()) {
+    totalMonths--;
+  }
+
+  const finalYears = Math.floor(totalMonths / 12);
+  const finalMonths = totalMonths % 12;
+
+  let duration = "";
+  if (finalYears > 0) {
+    duration += `${finalYears} year${finalYears > 1 ? "s" : ""}`;
+  }
+  if (finalMonths > 0) {
+    if (duration) duration += " ";
+    duration += `${finalMonths} month${finalMonths > 1 ? "s" : ""}`;
+  }
+  return duration;
+}
+
+function formatDateRange(startDate, endDate) {
+  const start = new Date(startDate);
+  const end = endDate ? new Date(endDate) : new Date();
+
+  const formatDate = (date) => {
+    return date.toLocaleDateString("en-US", {
+      month: "short",
+      year: "numeric",
+    });
+  };
+
+  const duration = calculateDuration(startDate, endDate);
+  return `${formatDate(start)} - ${endDate ? formatDate(end) : "Present"} · ${duration}`;
+}