diff --git a/scripts/init_db.py b/scripts/init_db.py
index 8bc70fb..f378b5c 100644
--- a/scripts/init_db.py
+++ b/scripts/init_db.py
@@ -3,7 +3,7 @@
 import os
 import re
 import sqlite3
-from datetime import datetime
+from datetime import datetime, timezone
 
 LOG_DIR = "/var/log/nginx"
 DB_FILE = "database/ngxstat.db"
@@ -42,10 +42,16 @@ cursor.execute("SELECT time FROM logs ORDER BY id DESC LIMIT 1")
 row = cursor.fetchone()
 last_dt = None
 if row and row[0]:
-    try:
-        last_dt = datetime.strptime(row[0], DATE_FMT)
-    except ValueError:
-        last_dt = None
+    # Support both legacy log date format and ISO timestamps
+    for fmt in ("%Y-%m-%d %H:%M:%S", DATE_FMT):
+        try:
+            parsed = datetime.strptime(row[0], fmt)
+            if fmt == DATE_FMT:
+                parsed = parsed.astimezone(timezone.utc).replace(tzinfo=None)
+            last_dt = parsed
+            break
+        except ValueError:
+            continue
 
 try:
     log_files = []
@@ -74,6 +80,7 @@ for log_file in log_files:
                     entry_dt = datetime.strptime(data["time"], DATE_FMT)
                 except ValueError:
                     continue
+                entry_dt = entry_dt.astimezone(timezone.utc).replace(tzinfo=None)
                 if last_dt and entry_dt <= last_dt:
                     continue
                 cursor.execute(
@@ -86,7 +93,7 @@ for log_file in log_files:
                     (
                         data["ip"],
                         data["host"],
-                        data["time"],
+                        entry_dt.strftime("%Y-%m-%d %H:%M:%S"),
                         data["request"],
                         int(data["status"]),
                         int(data["bytes_sent"]),