diff --git a/src/app/Entitlement.php b/src/app/Entitlement.php
--- a/src/app/Entitlement.php
+++ b/src/app/Entitlement.php
@@ -81,14 +81,16 @@
      *
      * @return string The transaction ID
      */
-    public function createTransaction($type, $amount = null)
+    public function createTransaction($type, $amount = null, $period_start = null, $period_end = null)
     {
         $transaction = \App\Transaction::create(
             [
                 'object_id' => $this->id,
                 'object_type' => \App\Entitlement::class,
                 'type' => $type,
-                'amount' => $amount
+                'amount' => $amount,
+                'period_start' => $period_start,
+                'period_end' => $period_end
             ]
         );
 
diff --git a/src/app/Http/Controllers/API/V4/WalletsController.php b/src/app/Http/Controllers/API/V4/WalletsController.php
--- a/src/app/Http/Controllers/API/V4/WalletsController.php
+++ b/src/app/Http/Controllers/API/V4/WalletsController.php
@@ -257,6 +257,8 @@
                 'createdAt' => $item->created_at->format('Y-m-d H:i'),
                 'type' => $item->type,
                 'description' => $item->shortDescription(),
+                'period_start' => $item->period_start,
+                'period_end' => $item->period_end,
                 'amount' => $amount,
                 'hasDetails' => !empty($item->cnt),
             ];
diff --git a/src/app/Transaction.php b/src/app/Transaction.php
--- a/src/app/Transaction.php
+++ b/src/app/Transaction.php
@@ -46,6 +46,9 @@
         'amount',
 
         'description',
+        // timespan that was charged for
+        'period_start',
+        'period_end',
 
         // parent, for example wallet debit is parent for entitlements charged.
         'transaction_id'
diff --git a/src/app/Wallet.php b/src/app/Wallet.php
--- a/src/app/Wallet.php
+++ b/src/app/Wallet.php
@@ -109,9 +109,13 @@
                     continue;
                 }
 
+                $period_start = $entitlement->updated_at->copy();
+
                 $entitlement->updated_at = $entitlement->updated_at->copy()
                     ->addMonthsWithoutOverflow($diff);
 
+                $period_end = $entitlement->updated_at->copy();
+
                 $entitlement->save();
 
                 if ($cost == 0) {
@@ -120,7 +124,9 @@
 
                 $entitlementTransactions[] = $entitlement->createTransaction(
                     \App\Transaction::ENTITLEMENT_BILLED,
-                    $cost
+                    $cost,
+                    $period_start,
+                    $period_end
                 );
             }
         }
diff --git a/src/database/migrations/2021_01_14_093842_add_timespan_to_transactions_table.php b/src/database/migrations/2021_01_14_093842_add_timespan_to_transactions_table.php
new file mode 100644
--- /dev/null
+++ b/src/database/migrations/2021_01_14_093842_add_timespan_to_transactions_table.php
@@ -0,0 +1,33 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class AddTimespanToTransactionsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('transactions', function (Blueprint $table) {
+            $table->timestamp('created_at')->useCurrent();
+            $table->timestamp('updated_at')->useCurrent();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('transactions', function (Blueprint $table) {
+            //
+        });
+    }
+}
diff --git a/src/resources/themes/kolabnow b/src/resources/themes/kolabnow
new file mode 160000
--- /dev/null
+++ b/src/resources/themes/kolabnow
@@ -0,0 +1 @@
+Subproject commit 02d736bfbd6b19e9d6957eaf0fa4887b6d0f7589
diff --git a/src/resources/vue/Widgets/TransactionLog.vue b/src/resources/vue/Widgets/TransactionLog.vue
--- a/src/resources/vue/Widgets/TransactionLog.vue
+++ b/src/resources/vue/Widgets/TransactionLog.vue
@@ -111,8 +111,15 @@
             description(transaction) {
                 let desc = transaction.description
 
+                if(transaction.period_start && transaction.period_end) {
+                    let from = new Date(transaction.period_start)
+                    let till = new Date(transaction.period_end)
+
+                    desc += ' (' + from.toLocaleDateString() + ' - ' + till.toLocaleDateString() + ')'
+                }
+
                 if (/^(billed|created|deleted)$/.test(transaction.type)) {
-                    desc += ' (' + this.$root.price(transaction.amount) + ')'
+                    desc += ' (' + this.$root.price(transaction.amount) +')'
                 }
 
                 return desc