diff --git a/src/pages/BugForm/toIsoStringWithTimezone.ts b/src/pages/BugForm/toIsoStringWithTimezone.ts
index 723d6178..ac63cb63 100644
--- a/src/pages/BugForm/toIsoStringWithTimezone.ts
+++ b/src/pages/BugForm/toIsoStringWithTimezone.ts
@@ -5,7 +5,7 @@ export const toISOStringWithTimezone = (date: Date, time: Date) => {
   return (
     date.getFullYear() +
     "-" +
-    pad(date.getMonth()) +
+    pad(date.getMonth() + 1) +
     "-" +
     pad(date.getDate()) +
     "T" +