From 51d626e36610c4aad22a67435df348f950f3f216 Mon Sep 17 00:00:00 2001
From: Anirudh Pillai <anirudhx5@gmail.com>
Date: Thu, 25 Sep 2025 07:56:11 +0100
Subject: [PATCH] fix(retention): tooltip date formatting (#38530)

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>
---
 .../scenes/insights/InsightTooltip/insightTooltipUtils.tsx  | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/frontend/src/scenes/insights/InsightTooltip/insightTooltipUtils.tsx b/frontend/src/scenes/insights/InsightTooltip/insightTooltipUtils.tsx
index a158edb77e..e4d1d4203a 100644
--- a/frontend/src/scenes/insights/InsightTooltip/insightTooltipUtils.tsx
+++ b/frontend/src/scenes/insights/InsightTooltip/insightTooltipUtils.tsx
@@ -133,6 +133,12 @@ export function getFormattedDate(input?: string | number, options?: FormattedDat
         return pluralize(input as number, interval ?? 'day')
     }
 
+    // Handle retention graph labels like "Day 0", "Week 12", etc.
+    // retention tooltips don't show the date/header, so we don't need to format it
+    if (typeof input === 'string' && /^(Day|Week|Month|Hour) \d+$/.test(input)) {
+        return input
+    }
+
     const day = dayjs.tz(input, timezone)
     if (input === undefined || !day.isValid()) {
         return String(input)