diff --git a/lib/check-in/service.ts b/lib/check-in/service.ts
index 4fda3aa..63334fd 100644
--- a/lib/check-in/service.ts
+++ b/lib/check-in/service.ts
@@ -1,5 +1,6 @@
 import { getAuthenticatedUser } from "@/lib/auth/session";
 import { deriveBudgetSnapshot } from "@/lib/check-in/budget";
+import { getLocalDateForTimezone } from "@/lib/dates";
 import { ensureProfileBundleForCurrentUser } from "@/lib/profile/service";
 import { createClient } from "@/lib/supabase/server";
 import type {
@@ -53,26 +54,6 @@ function mapMorningCheckInRow(row: MorningCheckInRow): MorningCheckInRecord {
   };
 }
 
-function getLocalDateForTimezone(timezone: string, date = new Date()) {
-  const formatter = new Intl.DateTimeFormat("en-CA", {
-    timeZone: timezone,
-    year: "numeric",
-    month: "2-digit",
-    day: "2-digit",
-  });
-
-  const parts = formatter.formatToParts(date);
-  const year = parts.find((part) => part.type === "year")?.value;
-  const month = parts.find((part) => part.type === "month")?.value;
-  const day = parts.find((part) => part.type === "day")?.value;
-
-  if (!year || !month || !day) {
-    throw new Error("Lokale datum voor timezone kon niet worden bepaald.");
-  }
-
-  return `${year}-${month}-${day}`;
-}
-
 async function readMorningCheckInByDate(
   supabase: SupabaseServerClient,
   userId: string,
diff --git a/lib/dates.ts b/lib/dates.ts
new file mode 100644
index 0000000..f1950df
--- /dev/null
+++ b/lib/dates.ts
@@ -0,0 +1,19 @@
+export function getLocalDateForTimezone(timezone: string, date = new Date()) {
+  const formatter = new Intl.DateTimeFormat("en-CA", {
+    timeZone: timezone,
+    year: "numeric",
+    month: "2-digit",
+    day: "2-digit",
+  });
+
+  const parts = formatter.formatToParts(date);
+  const year = parts.find((part) => part.type === "year")?.value;
+  const month = parts.find((part) => part.type === "month")?.value;
+  const day = parts.find((part) => part.type === "day")?.value;
+
+  if (!year || !month || !day) {
+    throw new Error("Lokale datum voor timezone kon niet worden bepaald.");
+  }
+
+  return `${year}-${month}-${day}`;
+}
diff --git a/lib/planning/service.ts b/lib/planning/service.ts
index f226276..e5e11b2 100644
--- a/lib/planning/service.ts
+++ b/lib/planning/service.ts
@@ -1,4 +1,5 @@
 import { getAuthenticatedUser } from "@/lib/auth/session";
+import { getLocalDateForTimezone } from "@/lib/dates";
 import { calculateDayOverviewSnapshot } from "@/lib/planning/day-overview";
 import type {
   ActivityCategory,
@@ -104,26 +105,6 @@ function mapActivityRow(row: ActivityRow): ActivityRecord {
   };
 }
 
-function getLocalDateForTimezone(timezone: string, date = new Date()) {
-  const formatter = new Intl.DateTimeFormat("en-CA", {
-    timeZone: timezone,
-    year: "numeric",
-    month: "2-digit",
-    day: "2-digit",
-  });
-
-  const parts = formatter.formatToParts(date);
-  const year = parts.find((part) => part.type === "year")?.value;
-  const month = parts.find((part) => part.type === "month")?.value;
-  const day = parts.find((part) => part.type === "day")?.value;
-
-  if (!year || !month || !day) {
-    throw new Error("Lokale plandatum voor timezone kon niet worden bepaald.");
-  }
-
-  return `${year}-${month}-${day}`;
-}
-
 function assertIsoDate(value: string) {
   if (!ISO_DATE_PATTERN.test(value)) {
     throw new Error("Ongeldige plandatum. Gebruik het formaat YYYY-MM-DD.");