First push

bookshop/handlers/AdminService.Authors.READ.js

@@ -1,5 +1,28 @@
+function getYear(v) {
+  return parseInt(v.substr(0, 4))
+}
+function getMonth(v) {
+  return parseInt(v.substr(5, 2))
+}
+function getDay(v) {
+  return parseInt(v.substr(8, 2))
+}
+
+function getAge(from, to) {
+  if (from === undefined || from == null) return 0
+  if (to === undefined || to == null) to = new Date().toISOString()
+  let year = getYear(to) - getYear(from) - 1
+  if (
+    getMonth(to) > getMonth(from) ||
+    (getMonth(to) === getMonth(from) && getDay(to) >= getDay(from))
+  ) {
+    year++
+  }
+  return year
+}
+
 const result_ = Array.isArray(result) ? result : [result]
 for (const row of result_) {
   row.modifiedBy += " --- read in sandbox"
-  row.age = 27
+  row.age = getAge(row.dateOfBirth, row.dateOfDeath)
 }