New: Add JS function to get the relative date

Resources/Private/Assets/getDate.js

@@ -0,0 +1,29 @@
+function formatDate(date) {
+    return date.toISOString().split("T")[0];
+}
+
+export default function getDate(options, formatDateFunction = formatDate) {
+    if (!options) {
+        return null;
+    }
+    const { unit, amount } = options;
+    if (typeof amount != "number") {
+        return null;
+    }
+
+    const date = new Date();
+    if (amount == 0) {
+        return formatDateFunction(date);
+    }
+
+    if (unit == "year") {
+        return formatDateFunction(new Date(date.setFullYear(date.getFullYear() + amount)));
+    }
+
+    if (unit == "month") {
+        return formatDateFunction(new Date(date.setMonth(date.getMonth() + amount)));
+    }
+
+    const days = unit == "week" ? amount * 7 : amount;
+    return formatDateFunction(new Date(date.setDate(date.getDate() + days)));
+}