Fix inconsistent timezone handling in contributions API and StreakCalendar

src/app/api/metrics/contributions/route.ts

@@ -17,10 +17,6 @@ interface ContributionResponse {
   data: Record<string, number>;
 }
 
-function toLocalDateStr(d: Date): string {
-  return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, "0")}-${String(d.getDate()).padStart(2, "0")}`;
-}
-
 function mergeContributionDays(
   a: Record<string, number>,
   b: Record<string, number>
@@ -39,7 +35,7 @@ async function fetchContributionsForAccount(
 ): Promise<ContributionResponse> {
   const since = new Date();
   since.setDate(since.getDate() - days);
-  const sinceStr = toLocalDateStr(since);
+  const sinceStr = since.toISOString().slice(0, 10);
 
   const searchRes = await fetch(
     `${GITHUB_API}/search/commits?q=author:${githubLogin}+author-date:>=${sinceStr}&per_page=100&sort=author-date&order=desc`,

src/app/api/metrics/prs/route.ts

@@ -34,11 +34,11 @@ async function fetchPRMetrics(token: string): Promise<PRMetricsBase> {
 
   const data = (await searchRes.json()) as {
     total_count: number;
-    items: Array<{ state: string; created_at: string; closed_at: string | null }>;
+    items: Array<{ state: string; created_at: string; closed_at: string | null; pull_request?: { merged_at: string | null } }>;
   };
 
   const open = data.items.filter((pr) => pr.state === "open").length;
-  const merged = data.items.filter((pr) => pr.state === "closed").length;
+  const merged = data.items.filter((pr) => pr.pull_request?.merged_at != null).length;
 
   const closedPRs = data.items.filter((pr) => pr.closed_at);
   const avgReviewMs =

src/app/api/metrics/repos/route.ts

@@ -71,6 +71,42 @@ async function fetchReposForAccount(
     repoMap[name] = (repoMap[name] ?? 0) + 1;
   }
 
+  const linkHeader = searchRes.headers.get("link");
+  const pagePattern = /<[^>]*[?&]page=(\d+)[^>]*>;\s*rel="last"/;
+  const lastPageMatch = linkHeader?.match(pagePattern);
+  if (lastPageMatch) {
+    const lastPage = parseInt(lastPageMatch[1], 10);
+    const pagePromises: Promise<Response>[] = [];
+    for (let page = 2; page <= Math.min(lastPage, 5); page++) {
+      pagePromises.push(
+        fetch(
+          `${GITHUB_API}/search/commits?q=author:${githubLogin}+author-date:>=${sinceStr}&per_page=100&page=${page}&sort=author-date&order=desc`,
+          {
+            headers: {
+              Authorization: `Bearer ${token}`,
+              Accept: "application/vnd.github+json",
+            },
+            cache: "no-store",
+          }
+        )
+      );
+    }
+    const pageResults = await Promise.allSettled(pagePromises);
+    for (const res of pageResults) {
+      if (res.status !== "fulfilled" || !res.value.ok) continue;
+      const pageData = (await res.value.json()) as {
+        items: Array<{
+          repository: { full_name: string; html_url: string };
+          commit: { author: { date: string } };
+        }>;
+      };
+      for (const item of pageData.items) {
+        const name = item.repository.full_name;
+        repoMap[name] = (repoMap[name] ?? 0) + 1;
+      }
+    }
+  }
+
   const repos = Object.entries(repoMap)
     .map(([name, commits]) => ({ name, commits }))
     .sort((a, b) => b.commits - a.commits)

src/app/api/metrics/streak/route.ts

@@ -49,6 +49,38 @@ async function fetchActiveDates(
     activeDates.add(item.commit.author.date.slice(0, 10));
   }
 
+  const linkHeader = searchRes.headers.get("link");
+  const pagePattern = /<[^>]*[?&]page=(\d+)[^>]*>;\s*rel="last"/;
+  const lastPageMatch = linkHeader?.match(pagePattern);
+  if (lastPageMatch) {
+    const lastPage = parseInt(lastPageMatch[1], 10);
+    const pagePromises: Promise<Response>[] = [];
+    for (let page = 2; page <= Math.min(lastPage, 5); page++) {
+      pagePromises.push(
+        fetch(
+          `${GITHUB_API}/search/commits?q=author:${githubLogin}+author-date:>=${sinceStr}&per_page=100&page=${page}&sort=author-date&order=desc`,
+          {
+            headers: {
+              Authorization: `Bearer ${token}`,
+              Accept: "application/vnd.github+json",
+            },
+            cache: "no-store",
+          }
+        )
+      );
+    }
+    const pageResults = await Promise.allSettled(pagePromises);
+    for (const res of pageResults) {
+      if (res.status !== "fulfilled" || !res.value.ok) continue;
+      const pageData = (await res.value.json()) as {
+        items: Array<{ commit: { author: { date: string } } }>;
+      };
+      for (const item of pageData.items) {
+        activeDates.add(item.commit.author.date.slice(0, 10));
+      }
+    }
+  }
+
   return activeDates;
 }
 

src/components/StreakTracker.tsx

@@ -394,8 +394,8 @@ interface StreakCalendarProps {
   onMonthChange: (date: Date) => void;
 }
 
-function toLocalDateStr(d: Date): string {
-  return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, "0")}-${String(d.getDate()).padStart(2, "0")}`;
+function toUtcDateStr(d: Date): string {
+  return d.toISOString().slice(0, 10);
 }
 
 function StreakCalendar({ contributions, currentMonth, onMonthChange }: StreakCalendarProps) {
@@ -463,10 +463,10 @@ function StreakCalendar({ contributions, currentMonth, onMonthChange }: StreakCa
             return <div key={`empty-${idx}`} className="aspect-square" />;
           }
 
-          const dateStr = toLocalDateStr(dayData.date);
+          const dateStr = toUtcDateStr(dayData.date);
           const commitCount = contributions[dateStr] ?? 0;
           const isFuture = dayData.date > today;
-          const isToday = dayData.date.toDateString() === today.toDateString();
+          const isToday = toUtcDateStr(dayData.date) === toUtcDateStr(today);
 
           let bgColor = "bg-white dark:bg-transparent";
           let borderColor = "border border-[var(--border)]";