diff --git a/gallery_dl/extractor/koharu.py b/gallery_dl/extractor/koharu.py
index b209830b..62c6032c 100644
--- a/gallery_dl/extractor/koharu.py
+++ b/gallery_dl/extractor/koharu.py
@@ -25,6 +25,22 @@ class KoharuGalleryExtractor(GalleryExtractor):
     pattern = BASE_PATTERN + r"/(?:g|reader)/(\d+)/(\w+)"
     example = "https://koharu.to/g/12345/67890abcde/"
 
+    TAG_TYPES = {
+        0 : "general",
+        1 : "artist",
+        2 : "circle",
+        3 : "parody",
+        4 : "magazine",
+        5 : "character",
+        6 : "",
+        7 : "uploader",
+        8 : "male",
+        9 : "female",
+        10: "mixed",
+        11: "language",
+        12: "other",
+    }
+
     def __init__(self, match):
         GalleryExtractor.__init__(self, match)
         self.gallery_url = None
@@ -49,6 +65,15 @@ class KoharuGalleryExtractor(GalleryExtractor):
         self.data = data = self.request(url, headers=self.headers).json()
         data.pop("rels", None)
         data.pop("thumbnails", None)
+
+        tags = []
+        for tag in data["tags"]:
+            name = tag["name"]
+            namespace = tag.get("namespace", 0)
+            tags.append(self.TAG_TYPES[namespace] + ":" + name)
+        data["tags"] = tags
+        data["date"] = text.parse_timestamp(data["created_at"] // 1000)
+
         return data
 
     def images(self, _):
diff --git a/test/results/koharu.py b/test/results/koharu.py
index 198a64bc..e44c017d 100644
--- a/test/results/koharu.py
+++ b/test/results/koharu.py
@@ -17,12 +17,32 @@ __tests__ = (
 
     "count"     : 1,
     "created_at": 1721626410802,
+    "date"      : "dt:2024-07-22 05:33:30",
     "extension" : "cbz",
     "filename"  : "f47639c6abaf1903dd69c36a3d961da84741a1831aa07a2906ce9c74156a5d75",
     "id"        : 14216,
     "num"       : 1,
     "public_key": "6c67076fdd45",
-    "tags"      : list,
+    "tags": [
+        "general:beach",
+        "general:booty",
+        "general:dark skin",
+        "general:fingering",
+        "general:handjob",
+        "general:light hair",
+        "general:nakadashi",
+        "general:outdoors",
+        "general:ponytail",
+        "general:swimsuit",
+        "general:x-ray",
+        "artist:ouchi kaeru",
+        "magazine:comic kairakuten 2024-08",
+        "female:busty",
+        "language:english",
+        "language:translated",
+        "other:uncensored",
+        "other:vanilla",
+    ],
     "title"     : "[Ouchi Kaeru] Summer Business (Comic Kairakuten 2024-08)",
     "updated_at": 1721626410802,
 },