diff --git a/src/app/page.tsx b/src/app/page.tsx
index 3b453b8..da8c0f4 100644
--- a/src/app/page.tsx
+++ b/src/app/page.tsx
@@ -23,6 +23,7 @@ import { Badge } from "@/components/ui/badge"
 import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogFooter } from "@/components/ui/dialog"
 import { Textarea } from "@/components/ui/textarea"
 import { Label } from "@/components/ui/label"
+import { parseSprintEnd, parseSprintStart } from "@/lib/utils"
 import { generateAvatarDataUrl } from "@/lib/avatar"
 import {
   blobFromDataUrl,
@@ -588,9 +589,9 @@ export default function Home() {
   const now = new Date()
   const currentSprint = sprints.find((s) => {
     if (s.status !== 'active') return false
-    const sprintEnd = new Date(s.endDate)
-    sprintEnd.setHours(23, 59, 59, 999)
-    return new Date(s.startDate) <= now && sprintEnd >= now
+    const sprintStart = parseSprintStart(s.startDate)
+    const sprintEnd = parseSprintEnd(s.endDate)
+    return sprintStart <= now && sprintEnd >= now
   })
   
   // Filter tasks to only show current sprint tasks in Kanban (from ALL projects)
@@ -618,8 +619,7 @@ export default function Home() {
     const now = new Date()
     const endedSprints = sprints.filter((s) => {
       if (s.status !== 'active') return false
-      const sprintEnd = new Date(s.endDate)
-      sprintEnd.setHours(23, 59, 59, 999)
+      const sprintEnd = parseSprintEnd(s.endDate)
       return sprintEnd < now
     })
 
diff --git a/src/components/BacklogView.tsx b/src/components/BacklogView.tsx
index 36734ac..4a8da52 100644
--- a/src/components/BacklogView.tsx
+++ b/src/components/BacklogView.tsx
@@ -25,6 +25,7 @@ import { Badge } from "@/components/ui/badge"
 import { Button } from "@/components/ui/button"
 import { Plus, GripVertical, ChevronDown, ChevronRight, Calendar } from "lucide-react"
 import { format, isValid, parseISO } from "date-fns"
+import { parseSprintEnd, parseSprintStart } from "@/lib/utils"
 import { generateAvatarDataUrl } from "@/lib/avatar"
 
 const priorityColors: Record<string, string> = {
@@ -310,9 +311,9 @@ export function BacklogView({ searchQuery = "" }: BacklogViewProps) {
   const now = new Date()
   const currentSprint = sprints.find((s) => {
     if (s.status !== "active") return false
-    const sprintEnd = new Date(s.endDate)
-    sprintEnd.setHours(23, 59, 59, 999)
-    return new Date(s.startDate) <= now && sprintEnd >= now
+    const sprintStart = parseSprintStart(s.startDate)
+    const sprintEnd = parseSprintEnd(s.endDate)
+    return sprintStart <= now && sprintEnd >= now
   })
 
   // Get other sprints (not current)
diff --git a/src/lib/utils.ts b/src/lib/utils.ts
index bd0c391..635a16b 100644
--- a/src/lib/utils.ts
+++ b/src/lib/utils.ts
@@ -4,3 +4,30 @@ import { twMerge } from "tailwind-merge"
 export function cn(...inputs: ClassValue[]) {
   return twMerge(clsx(inputs))
 }
+
+const DATE_ONLY_PATTERN = /^\d{4}-\d{2}-\d{2}$/
+
+function parseDateParts(value: string): [number, number, number] {
+  const [year, month, day] = value.split("-").map(Number)
+  return [year, month, day]
+}
+
+export function parseSprintStart(startDate: string): Date {
+  if (DATE_ONLY_PATTERN.test(startDate)) {
+    const [year, month, day] = parseDateParts(startDate)
+    return new Date(year, month - 1, day, 0, 0, 0, 0)
+  }
+
+  return new Date(startDate)
+}
+
+export function parseSprintEnd(endDate: string): Date {
+  if (DATE_ONLY_PATTERN.test(endDate)) {
+    const [year, month, day] = parseDateParts(endDate)
+    return new Date(year, month - 1, day, 23, 59, 59, 999)
+  }
+
+  const parsed = new Date(endDate)
+  parsed.setHours(23, 59, 59, 999)
+  return parsed
+}