make post date correspond to event begin date

event_template.md

@@ -1,6 +1,6 @@
 ---
 title: "{{ event.name }}"
-date: "{{ event.created }}" #2021-06-10T10:46:33+02:00
+date: "{{ event.begin}}" #2021-06-10T10:46:33+02:00
 draft: false
 category: "calendar"
 event_begin: "{{ event.begin }}"