diff --git a/update_db.py b/update_db.py
index 7bd57e9..cf96f56 100644
--- a/update_db.py
+++ b/update_db.py
@@ -1,16 +1,17 @@
+from __future__ import annotations
+
 import json
 import os
 import random
 import string
 import time
 from dataclasses import dataclass
-from datetime import datetime
+from datetime import datetime, timedelta
 from typing import TypedDict, cast
 
 import mysql.connector
 import requests
 
-
 DbNull = (None,)
 DbNullType = tuple[None]
 
@@ -69,7 +70,7 @@ def update_tables (
         video = VideoDto (code          = datum['contentId'],
                           title         = datum['title'],
                           description   = datum['description'],
-                          uploaded_at   = datum['startTime'])
+                          uploaded_at   = datetime.fromisoformat (datum['startTime']))
         video_dao.upsert (video, False)
         if video.id_ is not None:
             video_history = VideoHistoryDto (video_id       = video.id_,
@@ -160,30 +161,42 @@ def search_nico_by_tag (
 def search_nico_by_tags (
         tags:   list[str],
 ) -> list[VideoResult]:
+    today = datetime.now ()
+
     url = ('https://snapshot.search.nicovideo.jp'
             + '/api/v2/snapshot/video/contents/search')
 
-    # TODO: 年月日の設定ができてゐなぃのと，100 件までしか取得できなぃので何とかすること
-
-    query_filter = json.dumps ({ 'type':    'or',
-                                 'filters': [
-            { 'type':          'range',
-              'field':         'startTime',
-              'from':          f"{year}-{start}T00:00:00+09:00",
-              'to':            f"{year}-{end}T23:59:59+09:00",
-              'include_lower': True }] })
-
-    params: VideoSearchParam
-    params = { 'q':          ' OR '.join (tags),
-               'targets':    'tagsExact',
-               '_sort':      '-viewCounter',
-               'fields':     'contentId,title,tags,description,viewCounter,startTime',
-               '_limit':     100,
-               'jsonFilter': query_filter }
-
-    res = requests.get (url, params = cast (dict[str, int | str], params), timeout = 60).json ()
-
-    return res['data']
+    result_data: list[VideoResult] = []
+    to = datetime (2022, 12, 3)
+    while to <= today:
+        time.sleep (1.2)
+        until = to + timedelta (days = 14)
+        query_filter = json.dumps ({ 'type':    'or',
+                                     'filters': [
+                { 'type':          'range',
+                  'field':         'startTime',
+                  'from':          '%04d-%02d-%02dT00:00:00+09:00' % (to.year, to.month, to.day),
+                  'to':            '%04d-%02d-%02dT23:59:59+09:00' % (until.year, until.month, until.day),
+                  'include_lower': True }] })
+        params: VideoSearchParam = { 'q':          ' OR '.join (tags),
+                                     'targets':    'tagsExact',
+                                     '_sort':      '-viewCounter',
+                                     'fields':     ('contentId,'
+                                                    'title,'
+                                                    'tags,'
+                                                    'description,'
+                                                    'viewCounter,'
+                                                    'startTime'),
+                                     '_limit':     100,
+                                     'jsonFilter': query_filter }
+        res = requests.get (url, params = cast (dict[str, int | str], params), timeout = 60).json ()
+        try:
+            result_data += res['data']
+        except KeyError:
+            pass
+        to = until + timedelta (days = 1)
+
+    return result_data
 
 
 class VideoDao: