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diff --git a/packages/aml-backoffice-ui/src/handlers/Calendar.tsx b/packages/aml-backoffice-ui/src/handlers/Calendar.tsx
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+++ b/packages/aml-backoffice-ui/src/handlers/Calendar.tsx
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+import { AbsoluteTime } from "@gnu-taler/taler-util"
+import { useTranslationContext } from "@gnu-taler/web-util/browser"
+import { add as dateAdd, sub as dateSub, eachDayOfInterval, endOfMonth, endOfWeek, format, getMonth, getYear, isSameDay, isSameMonth, startOfDay, startOfMonth, startOfWeek } from "date-fns"
+import { VNode, h } from "preact"
+import { useState } from "preact/hooks"
+
+export function Calendar({ value, onChange }: { value: AbsoluteTime | undefined, onChange: (v: AbsoluteTime) => void }): VNode {
+  const today = startOfDay(new Date())
+  const selected = !value ? today : new Date(AbsoluteTime.toStampMs(value))
+  const [showingDate, setShowingDate] = useState(selected)
+  const month = getMonth(showingDate)
+  const year = getYear(showingDate)
+
+  const start = startOfWeek(startOfMonth(showingDate));
+  const end = endOfWeek(endOfMonth(showingDate));
+  const daysInMonth = eachDayOfInterval({ start, end });
+  const { i18n } = useTranslationContext()
+  const monthNames = [
+    i18n.str`January`,
+    i18n.str`February`,
+    i18n.str`March`,
+    i18n.str`April`,
+    i18n.str`May`,
+    i18n.str`June`,
+    i18n.str`July`,
+    i18n.str`August`,
+    i18n.str`September`,
+    i18n.str`October`,
+    i18n.str`November`,
+    i18n.str`December`,
+  ]
+  return <div class="text-center p-2">
+    <div class="flex items-center text-gray-900">
+      <button type="button" class="flex px-4 flex-none items-center justify-center p-1.5 text-gray-400 hover:text-gray-500 ring-2 round-sm"
+        onClick={() => {
+          setShowingDate(dateSub(showingDate, { years: 1 }))
+        }}>
+        <span class="sr-only">
+          {i18n.str`Previous year`}
+        </span>
+        <svg class="h-5 w-5" viewBox="0 0 20 20" fill="currentColor" aria-hidden="true">
+          <path fill-rule="evenodd" d="M12.79 5.23a.75.75 0 01-.02 1.06L8.832 10l3.938 3.71a.75.75 0 11-1.04 1.08l-4.5-4.25a.75.75 0 010-1.08l4.5-4.25a.75.75 0 011.06.02z" clip-rule="evenodd" />
+        </svg>
+      </button>
+      <div class="flex-auto text-sm font-semibold">{year}</div>
+      <button type="button" class="flex px-4 flex-none items-center justify-center p-1.5 text-gray-400 hover:text-gray-500 ring-2 round-sm"
+        onClick={() => {
+          setShowingDate(dateAdd(showingDate, { years: 1 }))
+        }}>
+        <span class="sr-only">
+          {i18n.str`Next year`}
+        </span>
+        <svg class="h-5 w-5" viewBox="0 0 20 20" fill="currentColor" aria-hidden="true">
+          <path fill-rule="evenodd" d="M7.21 14.77a.75.75 0 01.02-1.06L11.168 10 7.23 6.29a.75.75 0 111.04-1.08l4.5 4.25a.75.75 0 010 1.08l-4.5 4.25a.75.75 0 01-1.06-.02z" clip-rule="evenodd" />
+        </svg>
+      </button>
+    </div>
+    <div class="mt-4 flex items-center text-gray-900">
+      <button type="button" class="flex px-4 flex-none items-center justify-center p-1.5 text-gray-400 hover:text-gray-500 ring-2 round-sm"
+        onClick={() => {
+          setShowingDate(dateSub(showingDate, { months: 1 }))
+        }}>
+        <span class="sr-only">
+          {i18n.str`Previous month`}
+        </span>
+        <svg class="h-5 w-5" viewBox="0 0 20 20" fill="currentColor" aria-hidden="true">
+          <path fill-rule="evenodd" d="M12.79 5.23a.75.75 0 01-.02 1.06L8.832 10l3.938 3.71a.75.75 0 11-1.04 1.08l-4.5-4.25a.75.75 0 010-1.08l4.5-4.25a.75.75 0 011.06.02z" clip-rule="evenodd" />
+        </svg>
+      </button>
+      <div class="flex-auto text-sm font-semibold">{monthNames[month]}</div>
+      <button type="button" class="flex px-4 flex-none items-center justify-center p-1.5 text-gray-400 hover:text-gray-500 ring-2 rounded-sm "
+        onClick={() => {
+          setShowingDate(dateAdd(showingDate, { months: 1 }))
+        }}>
+        <span class="sr-only">
+          {i18n.str`Next month`}
+        </span>
+        <svg class="h-5 w-5" viewBox="0 0 20 20" fill="currentColor" aria-hidden="true">
+          <path fill-rule="evenodd" d="M7.21 14.77a.75.75 0 01.02-1.06L11.168 10 7.23 6.29a.75.75 0 111.04-1.08l4.5 4.25a.75.75 0 010 1.08l-4.5 4.25a.75.75 0 01-1.06-.02z" clip-rule="evenodd" />
+        </svg>
+      </button>
+    </div>
+    <div class="mt-6 grid grid-cols-7 text-xs leading-6 text-gray-500">
+      <div>M</div>
+      <div>T</div>
+      <div>W</div>
+      <div>T</div>
+      <div>F</div>
+      <div>S</div>
+      <div>S</div>
+    </div>
+    <div class="isolate mt-2 grid grid-cols-7 gap-px rounded-lg bg-gray-200 text-sm shadow ring-1 ring-gray-200">
+      {daysInMonth.map(current => (
+        <button type="button"
+          data-month={isSameMonth(current, showingDate)}
+          data-today={isSameDay(current, today)}
+          data-selected={isSameDay(current, selected)}
+          onClick={() => {
+            onChange(AbsoluteTime.fromStampMs(current.getTime()))
+          }}
+          class="text-gray-400 hover:bg-gray-700 focus:z-10 py-1.5 
+          data-[month=false]:bg-gray-100 data-[month=true]:bg-white 
+            data-[today=true]:font-semibold  
+          data-[month=true]:text-gray-900
+          data-[today=true]:bg-red-300 data-[today=true]:hover:bg-red-200
+          data-[month=true]:hover:bg-gray-200
+          data-[selected=true]:!bg-blue-400 data-[selected=true]:hover:!bg-blue-300 ">
+          <time dateTime={format(current, "yyyy-MM-dd")}
+            class="mx-auto flex h-7 w-7 items-center justify-center rounded-full">
+            {format(current, "dd")}
+          </time>
+        </button>
+      ))}
+    </div>
+  </div>
+}