diff --git a/calendars/networkx.yaml b/calendars/networkx.yaml
index 3561d51..b8dda86 100644
--- a/calendars/networkx.yaml
+++ b/calendars/networkx.yaml
@@ -7,7 +7,7 @@ events:
 
       Meeting link: https://colgate.zoom.us/j/92619161786
       Meeting notes: https://hackmd.io/ea2IhUuqSrG4kM9tokXuEw
-    begin: 2025-02-28 11:00:00
+    begin: 2025-02-28 11:00:00Z
     duration: { minutes: 60 }
     url: https://colgate.zoom.us/j/92619161786
     repeat:
@@ -23,9 +23,9 @@ events:
       Meeting notes: https://hackmd.io/rqs_pWMxSLmICXCpI3w-Ug
       Zoom meeting ID: 941 9287 4965
       Zoom meeting passcode: 572126
-    begin: 2025-02-25 11:30:00
+    begin: 2025-02-25 11:30:00Z
     duration: { minutes: 60 }
-    url: https://anaconda.zoom.us/j/94192874965?pwd=K0wvcmhXem41ZlVSQ2l4TXlUaDgxdz09
+    url: https://colgate.zoom.us/j/92619161786
     repeat:
       interval:
         days: 7