diff --git a/Pipfile b/Pipfile
index bba1c60..c31cd01 100644
--- a/Pipfile
+++ b/Pipfile
@@ -5,7 +5,7 @@ name = "pypi"
 
 [packages]
 bootstrap-flask = "*"
-feedparser = "*"
+feedparser = "6.0.8"
 flask-debugtoolbar = "*"
 flask-moment = "*"
 Flask = "*"
@@ -17,6 +17,7 @@ parsel = "*"
 flask-script = "*"
 icecream = "*"
 flask-analytics = "*"
+arrow = "1.2.2"
 
 [dev-packages]
 coverage = "*"
diff --git a/Pipfile.lock b/Pipfile.lock
index 9cbded3..da21d3a 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "244fdb2ca7e1595ca468c0f56bb8936b1fa6efce78ace99461e8ca813fe7114f"
+            "sha256": "f26715f8bf90baafbc19577704c69a2e335d990584d26a304e4e8604004f18a4"
         },
         "pipfile-spec": 6,
         "requires": {},
@@ -14,6 +14,14 @@
         ]
     },
     "default": {
+        "arrow": {
+            "hashes": [
+                "sha256:05caf1fd3d9a11a1135b2b6f09887421153b94558e5ef4d090b567b47173ac2b",
+                "sha256:d622c46ca681b5b3e3574fcb60a04e5cc81b9625112d5fb2b44220c36c892177"
+            ],
+            "index": "pypi",
+            "version": "==1.2.2"
+        },
         "asttokens": {
             "hashes": [
                 "sha256:0844691e88552595a6f4a4281a9f7f79b8dd45ca4ccea82e5e05b4bbdb76705c",
@@ -209,6 +217,14 @@
             "markers": "python_version >= '3.6'",
             "version": "==2.12.0"
         },
+        "python-dateutil": {
+            "hashes": [
+                "sha256:0123cacc1627ae19ddf3c27a5de5bd67ee4586fbdd6440d9748f8abb483d3e86",
+                "sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==2.8.2"
+        },
         "python-dotenv": {
             "hashes": [
                 "sha256:b7e3b04a59693c42c36f9ab1cc2acc46fa5df8c78e178fc33a8d4cd05c8d498f",
diff --git a/requirements.txt b/requirements.txt
index 9ffe42f..4d85427 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+arrow==1.2.2
 asttokens==2.0.5
 blinker==1.4
 Bootstrap-Flask==1.8.0
@@ -7,6 +8,7 @@ click==8.0.3
 colorama==0.4.4
 cssselect==1.1.0
 executing==0.8.2
+feedparser==6.0.8
 Flask==2.0.2
 Flask-Analytics==0.6.0
 Flask-DebugToolbar==0.11.0
diff --git a/rsshub/spiders/cls/subject.py b/rsshub/spiders/cls/subject.py
index b12b05b..14179c4 100644
--- a/rsshub/spiders/cls/subject.py
+++ b/rsshub/spiders/cls/subject.py
@@ -1,5 +1,6 @@
 import requests
 import json
+import arrow
 from rsshub.utils import DEFAULT_HEADERS
 
 
@@ -10,7 +11,7 @@ def parse(post):
     articleid = post['ArticleId']
     item['link'] = f'https://api3.cls.cn/share/article/{articleid}?os=android&sv=734&app='
     item['author'] = post['ArticleAuthor']
-    item['pubDate'] = post['ArticleTime']
+    item['pubDate'] = arrow.get(int(post['ArticleTime'])).isoformat()
     return item
 
 
diff --git a/rsshub/spiders/cls/telegraph.py b/rsshub/spiders/cls/telegraph.py
index ae1f5a6..cecebc9 100644
--- a/rsshub/spiders/cls/telegraph.py
+++ b/rsshub/spiders/cls/telegraph.py
@@ -1,13 +1,13 @@
 import requests
 from rsshub.utils import DEFAULT_HEADERS
-
+import arrow
 
 def parse(post):
     item = {}
     item['title'] = post['title'] if post['title'] != '' else post['content']
     item['description'] = post['content']
     item['link'] = post['shareurl']
-    item['pubDate'] = post['ctime']
+    item['pubDate'] = arrow.get(int(post['ctime'])).isoformat()
     return item
 
 
diff --git a/rsshub/spiders/rssfilter/filter.py b/rsshub/spiders/rssfilter/filter.py
index 41bdd1c..c881328 100644
--- a/rsshub/spiders/rssfilter/filter.py
+++ b/rsshub/spiders/rssfilter/filter.py
@@ -1,14 +1,14 @@
 import requests 
 import feedparser
+import arrow
 
 from rsshub.utils import DEFAULT_HEADERS
-from rsshub.utils import fetch
 
 def parse(post):
     item = {}
     item['title'] = post.title
     item['description'] = post.summary
-    item['pubDate'] = post.published if post.has_key('published') else ''
+    item['pubDate'] = post.published if post.has_key('published') else arrow.now().isoformat()
     item['link'] = post.link
     item['author'] = post.author if post.has_key('author') else ''
     return item