diff --git a/calendars/matplotlib.yaml b/calendars/matplotlib.yaml
index a1e41d5..58778ba 100644
--- a/calendars/matplotlib.yaml
+++ b/calendars/matplotlib.yaml
@@ -9,8 +9,8 @@ events:
 
       Meeting notes and agenda: https://hackmd.io/@matplotlib
 
-    begin: 2022-03-24 21:00:00
-    end: 2022-03-24 22:00:00
+    begin: 2022-03-24 21:00:00 +02:00
+    end: 2022-03-24 22:00:00 +02:00
     url: https://zoom.us/j/384435716?pwd=WFpxVWxoYXArTDFzN1lWaHNoOE8xZz09
     ics: RRULE:FREQ=WEEKLY;BYDAY=TH
 
@@ -24,8 +24,8 @@ events:
 
       Meeting notes: https://hackmd.io/@matplotlib
 
-    begin: 2023-02-07 19:00:00
-    end: 2023-02-07 20:00:00
+    begin: 2023-02-07 19:00:00 +02:00
+    end: 2023-02-07 20:00:00 +02:00
     url: https://numfocus-org.zoom.us/j/88077871096?pwd=bTxkJRug4Lmr8AiR9jNyntxBS4yGDe.1
     ics: RRULE:FREQ=MONTHLY;BYDAY=1TU;INTERVAL=2
 
@@ -39,8 +39,8 @@ events:
 
       Meeting notes: https://hackmd.io/@matplotlib
 
-    begin: 2023-03-07 13:00:00
-    end: 2023-03-07 14:00:00
+    begin: 2023-03-07 13:00:00 +02:00
+    end: 2023-03-07 14:00:00 +02:00
     url: https://numfocus-org.zoom.us/j/88077871096?pwd=bTxkJRug4Lmr8AiR9jNyntxBS4yGDe.1
     ics: RRULE:FREQ=MONTHLY;BYDAY=1TU;INTERVAL=2
 
@@ -52,7 +52,7 @@ events:
 
       Meeting notes: https://hackmd.io/@matplotlib/dwg
 
-    begin: 2023-12-15 19:00:00
-    end: 2023-12-15 20:00:00
+    begin: 2023-12-15 19:00:00 +02:00
+    end: 2023-12-15 20:00:00 +02:00
     url: https://us06web.zoom.us/j/81285851006?pwd=Tks2QjRkNWh5NGw0TmU1RUwwOVluZz09
     ics: RRULE:FREQ=WEEKLY;BYDAY=FR;INTERVAL=2