diff --git a/tools/collect_hbnj_all.py b/tools/collect_hbnj_all.py
index 0dfbe27..02e0419 100644
--- a/tools/collect_hbnj_all.py
+++ b/tools/collect_hbnj_all.py
@@ -2,6 +2,7 @@
 
 import argparse
 import re
+import sys
 import time
 from datetime import datetime, timezone
 from pathlib import Path
@@ -15,11 +16,27 @@ def main() -> int:
     parser.add_argument("--date", required=True, help="Broadcast date in YYYYMMDD form")
     parser.add_argument("--out", type=Path, required=True)
     parser.add_argument("--delay", type=float, default=0.5, help="Delay between region requests")
+    parser.add_argument(
+        "--retries",
+        type=int,
+        default=3,
+        help="Attempts per region before failing the complete build",
+    )
+    parser.add_argument(
+        "--retry-delay",
+        type=float,
+        default=1.0,
+        help="Initial retry delay in seconds (doubles after each failure)",
+    )
     args = parser.parse_args()
     if not re.fullmatch(r"\d{8}", args.date):
         raise SystemExit("--date must use YYYYMMDD")
     if args.delay < 0:
         raise SystemExit("--delay cannot be negative")
+    if args.retries < 1:
+        raise SystemExit("--retries must be at least 1")
+    if args.retry_delay < 0:
+        raise SystemExit("--retry-delay cannot be negative")
 
     areas: list[dict[str, object]] = []
     channels: list[dict[str, object]] = []
@@ -34,15 +51,30 @@ def main() -> int:
                 f"group={group_id} area={area_name}",
                 flush=True,
             )
-            source_url, source = fetch(group_id, args.date)
-            region = parse_region(
-                source,
-                group_id=group_id,
-                area_id=area_id,
-                area_name=area_name,
-                prefecture_raw=prefecture_raw,
-                source_url=source_url,
-            )
+            for attempt in range(1, args.retries + 1):
+                try:
+                    source_url, source = fetch(group_id, args.date)
+                    region = parse_region(
+                        source,
+                        group_id=group_id,
+                        area_id=area_id,
+                        area_name=area_name,
+                        prefecture_raw=prefecture_raw,
+                        source_url=source_url,
+                    )
+                    break
+                except Exception as error:
+                    if attempt == args.retries:
+                        raise
+                    wait = args.retry_delay * (2 ** (attempt - 1))
+                    print(
+                        f"  attempt {attempt}/{args.retries} failed: "
+                        f"{type(error).__name__}: {error}; retrying in {wait:g}s",
+                        file=sys.stderr,
+                        flush=True,
+                    )
+                    if wait:
+                        time.sleep(wait)
             area = dict(region["area"])
             areas.append(area)
             channels.extend(region["channels"])
diff --git a/tools/run_hbnj_daily.ps1 b/tools/run_hbnj_daily.ps1
index d7c7a55..6da0086 100644
--- a/tools/run_hbnj_daily.ps1
+++ b/tools/run_hbnj_daily.ps1
@@ -8,9 +8,16 @@ $log = Join-Path $logDirectory "hbnj-update-$stamp.log"
 Push-Location $workspace
 try {
     $env:PYTHONIOENCODING = "utf-8"
+    # Windows PowerShell promotes native stderr to an ErrorRecord. This Python
+    # installation emits a harmless prefix warning on stderr, so temporarily
+    # allow the process to finish and judge success by its actual exit code.
+    $previousErrorActionPreference = $ErrorActionPreference
+    $ErrorActionPreference = "Continue"
     & py -3 "tools\update_hbnj_daily.py" *>&1 | Tee-Object -FilePath $log
-    if ($LASTEXITCODE -ne 0) {
-        throw "HBNJ updater exited with code $LASTEXITCODE"
+    $updaterExitCode = $LASTEXITCODE
+    $ErrorActionPreference = $previousErrorActionPreference
+    if ($updaterExitCode -ne 0) {
+        throw "HBNJ updater exited with code $updaterExitCode"
     }
 }
 finally {
diff --git a/tools/update_hbnj_daily.py b/tools/update_hbnj_daily.py
index 51eb089..79443b7 100644
--- a/tools/update_hbnj_daily.py
+++ b/tools/update_hbnj_daily.py
@@ -7,14 +7,14 @@
 import subprocess
 import sys
 import tempfile
-from datetime import datetime
+from datetime import datetime, timedelta, timezone
 from pathlib import Path
-from zoneinfo import ZoneInfo
 
 
 WORKSPACE = Path(__file__).resolve().parents[1]
 PRIVATE = WORKSPACE / "channels" / "hbnj" / "private"
 CURRENT = WORKSPACE / "channels" / "hbnj" / "generated" / "current"
+JAPAN_STANDARD_TIME = timezone(timedelta(hours=9), name="JST")
 
 
 def run(*arguments: str) -> None:
@@ -56,8 +56,12 @@ def main() -> int:
         help="Broadcast date in YYYYMMDD form (default: current date in Japan)",
     )
     parser.add_argument("--delay", type=float, default=0.5)
+    parser.add_argument("--retries", type=int, default=3)
+    parser.add_argument("--retry-delay", type=float, default=1.0)
     args = parser.parse_args()
-    broadcast_date = args.date or datetime.now(ZoneInfo("Asia/Tokyo")).strftime("%Y%m%d")
+    # Japan has observed UTC+09:00 year-round since 1951, so this avoids an
+    # unnecessary dependency on the optional Windows IANA/tzdata package.
+    broadcast_date = args.date or datetime.now(JAPAN_STANDARD_TIME).strftime("%Y%m%d")
     if len(broadcast_date) != 8 or not broadcast_date.isdigit():
         raise SystemExit("--date must use YYYYMMDD")
 
@@ -74,6 +78,10 @@ def main() -> int:
             str(guide),
             "--delay",
             str(args.delay),
+            "--retries",
+            str(args.retries),
+            "--retry-delay",
+            str(args.retry_delay),
         )
         run("tools/validate_hbnj_guide.py", str(guide))
         run("tools/pack_hbnj_guide.py", str(guide), "--out-dir", str(payloads))