diff --git a/gallery_dl/extractor/8chan.py b/gallery_dl/extractor/8chan.py
index afa3a698..f81d2a1f 100644
--- a/gallery_dl/extractor/8chan.py
+++ b/gallery_dl/extractor/8chan.py
@@ -29,8 +29,10 @@ class _8chanExtractor(Extractor):
     def _init(self):
         now = util.datetime_utcnow()
         domain = self.root.rpartition("/")[2]
-        self.cookies.set("TOS20240928", "1", domain=domain)
-        self.cookies.set(now.strftime("TOS%Y%m%d"), "1", domain=domain)
+        self.cookies.set(
+            now.strftime("TOS%Y%m%d"), "1", domain=domain)
+        self.cookies.set(
+            (now - timedelta(1)).strftime("TOS%Y%m%d"), "1", domain=domain)
 
     @memcache()
     def cookies_prepare(self):
diff --git a/test/results/8chan.py b/test/results/8chan.py
index df281680..e9dc0cf4 100644
--- a/test/results/8chan.py
+++ b/test/results/8chan.py
@@ -30,7 +30,7 @@ __tests__ = (
     "markdown"        : str,
     "maxFileCount"    : 5,
     "maxFileSize"     : "32.00 MB",
-    "maxMessageLength": 8001,
+    "maxMessageLength": 12000,
     "message"         : str,
     "mime"            : str,
     "name"            : "Anonymous",
@@ -73,7 +73,7 @@ __tests__ = (
     "#category": ("", "8chan", "board"),
     "#class"   : _8chan._8chanBoardExtractor,
     "#pattern" : _8chan._8chanThreadExtractor.pattern,
-    "#count"   : range(24, 28),
+    "#count"   : range(24, 32),
 },
 
 {