diff --git a/backend/backend_api/models.py b/backend/backend_api/models.py
index a471002..1f27680 100644
--- a/backend/backend_api/models.py
+++ b/backend/backend_api/models.py
@@ -223,8 +223,8 @@ def google_calendar_link(self):
         base_url = "https://www.google.com/calendar/render?action=TEMPLATE"
         presentation_title = escape(self.name)
         presentation_description = escape(self.desc)
-        start_datetime = self.start_date.strftime("%Y%m%dT%H%M%S")
-        end_datetime = self.end_date.strftime("%Y%m%dT%H%M%S")
+        start_datetime = self.start_date.strftime("%Y%m%dT%H%M%SZ")
+        end_datetime = self.end_date.strftime("%Y%m%dT%H%M%SZ")
 
         presenters_names = " ".join([presenter.name for presenter in self.presenters.all()])
         event_details = f"Presenters: {presenters_names}\nDescription: {presentation_description}"