diff --git a/src/app/api/cron/garmin-sync/route.test.ts b/src/app/api/cron/garmin-sync/route.test.ts
index 27db71a..7d62cdf 100644
--- a/src/app/api/cron/garmin-sync/route.test.ts
+++ b/src/app/api/cron/garmin-sync/route.test.ts
@@ -414,15 +414,18 @@ describe("POST /api/cron/garmin-sync", () => {
       );
     });
 
-    it("sets date to today's date string", async () => {
+    it("sets date to today's ISO date string", async () => {
       mockUsers = [createMockUser()];
-      const today = new Date().toISOString().split("T")[0];
+      // Full ISO format for consistent date comparison in queries
+      const todayDate = new Date();
+      todayDate.setUTCHours(0, 0, 0, 0);
+      const todayISO = todayDate.toISOString();
 
       await POST(createMockRequest(`Bearer ${validSecret}`));
 
       expect(mockPbCreate).toHaveBeenCalledWith(
         expect.objectContaining({
-          date: today,
+          date: todayISO,
         }),
       );
     });
diff --git a/src/app/api/cron/garmin-sync/route.ts b/src/app/api/cron/garmin-sync/route.ts
index 6bed67c..adbaf74 100644
--- a/src/app/api/cron/garmin-sync/route.ts
+++ b/src/app/api/cron/garmin-sync/route.ts
@@ -91,7 +91,13 @@ export async function POST(request: Request) {
     (u) => u.garminConnected && u.garminTokenExpiresAt && u.lastPeriodDate,
   );
 
+  // YYYY-MM-DD format for Garmin API calls
   const today = new Date().toISOString().split("T")[0];
+  // Full ISO format for PocketBase date field storage
+  // This ensures consistent date comparison in queries
+  const todayDate = new Date();
+  todayDate.setUTCHours(0, 0, 0, 0);
+  const todayISO = todayDate.toISOString();
 
   for (const user of users) {
     const userSyncStartTime = Date.now();
@@ -208,9 +214,10 @@ export async function POST(request: Request) {
       // Store default value 100 for body battery when Garmin returns null.
       // This prevents PocketBase's number field null-to-0 coercion from
       // causing the dashboard to display 0 instead of a meaningful value.
+      // Use full ISO date format for consistent date comparison in queries
       await pb.collection("dailyLogs").create({
         user: user.id,
-        date: today,
+        date: todayISO,
         cycleDay,
         phase,
         bodyBatteryCurrent: bodyBattery.current ?? 100,
diff --git a/src/app/api/today/route.ts b/src/app/api/today/route.ts
index 6659292..67f1f21 100644
--- a/src/app/api/today/route.ts
+++ b/src/app/api/today/route.ts
@@ -74,13 +74,24 @@ export const GET = withAuth(async (_request, user, pb) => {
   // Sort by created DESC to get the most recent record if multiple exist
   let biometrics = { ...DEFAULT_BIOMETRICS, phaseLimit };
   try {
-    const today = new Date().toISOString().split("T")[0];
-    logger.info({ userId: user.id, today }, "Fetching dailyLog");
+    // Use date range query for proper date field comparison
+    // PocketBase date fields need >= and < operators, not string contains
+    const todayStart = new Date();
+    todayStart.setUTCHours(0, 0, 0, 0);
+    const tomorrowStart = new Date(todayStart.getTime() + 86400000);
+    const todayISO = todayStart.toISOString();
+    const tomorrowISO = tomorrowStart.toISOString();
+
+    logger.info(
+      { userId: user.id, todayISO, tomorrowISO },
+      "Fetching dailyLog",
+    );
     const dailyLog = await pb
       .collection("dailyLogs")
-      .getFirstListItem<DailyLog>(`user="${user.id}" && date~"${today}"`, {
-        sort: "-created",
-      });
+      .getFirstListItem<DailyLog>(
+        `user="${user.id}" && date>="${todayISO}" && date<"${tomorrowISO}"`,
+        { sort: "-created" },
+      );
 
     logger.info(
       {
diff --git a/src/lib/garmin.test.ts b/src/lib/garmin.test.ts
index c9f12af..88485fd 100644
--- a/src/lib/garmin.test.ts
+++ b/src/lib/garmin.test.ts
@@ -193,9 +193,7 @@ describe("fetchGarminData", () => {
       json: () => Promise.resolve(mockResponse),
     });
 
-    const result = await fetchGarminData("/wellness/daily/123", {
-      oauth2Token: "test-token",
-    });
+    const result = await fetchGarminData("/wellness/daily/123", "test-token");
 
     expect(result).toEqual(mockResponse);
   });