diff --git a/gallery_dl/dt.py b/gallery_dl/dt.py
index 9f1cd09e..3f803171 100644
--- a/gallery_dl/dt.py
+++ b/gallery_dl/dt.py
@@ -74,7 +74,7 @@ if sys.hexversion < 0x30c0000:
         except Exception:
             return NONE
 
-    def parse_compat(dt_string, format):
+    def parse_compat(dt_string, format="%Y-%m-%dT%H:%M:%S%z"):
         """Parse 'dt_string' as ISO 8601 value using 'format'"""
         return parse(dt_string, format)
 
@@ -90,7 +90,7 @@ else:
         except Exception:
             return NONE
 
-    def parse_compat(dt_string, format):
+    def parse_compat(dt_string, format=None):
         """Parse 'dt_string' as ISO 8601 value"""
         return parse_iso(dt_string)
 
diff --git a/gallery_dl/extractor/4archive.py b/gallery_dl/extractor/4archive.py
index 18948907..a8bb5d9c 100644
--- a/gallery_dl/extractor/4archive.py
+++ b/gallery_dl/extractor/4archive.py
@@ -61,10 +61,9 @@ class _4archiveThreadExtractor(Extractor):
         extr = text.extract_from(post)
         data = {
             "name": extr('class="name">', "</span>"),
-            "date": self.parse_datetime(
+            "date": self.parse_datetime_iso(
                 (extr('class="dateTime">', "<") or
-                 extr('class="dateTime postNum" >', "<")).strip(),
-                "%Y-%m-%d %H:%M:%S"),
+                 extr('class="dateTime postNum" >', "<")).strip()),
             "no"  : text.parse_int(extr(">Post No.", "<")),
         }
         if 'class="file"' in post:
diff --git a/gallery_dl/extractor/bellazon.py b/gallery_dl/extractor/bellazon.py
index 0e557cb6..44592b7a 100644
--- a/gallery_dl/extractor/bellazon.py
+++ b/gallery_dl/extractor/bellazon.py
@@ -141,8 +141,8 @@ class BellazonExtractor(Extractor):
             "title": schema["headline"],
             "views": stats[0]["userInteractionCount"],
             "posts": stats[1]["userInteractionCount"],
-            "date" : self.parse_datetime(schema["datePublished"]),
-            "date_updated": self.parse_datetime(schema["dateModified"]),
+            "date" : self.parse_datetime_iso(schema["datePublished"]),
+            "date_updated": self.parse_datetime_iso(schema["dateModified"]),
             "description" : text.unescape(schema["text"]).strip(),
             "section"     : path[-2],
             "author"      : author["name"],
@@ -162,7 +162,7 @@ class BellazonExtractor(Extractor):
         post = {
             "id": extr('id="elComment_', '"'),
             "author_url": extr(" href='", "'"),
-            "date": self.parse_datetime(extr("datetime='", "'")),
+            "date": self.parse_datetime_iso(extr("datetime='", "'")),
             "content": extr("<!-- Post content -->", "\n\t\t</div>"),
         }
 
diff --git a/gallery_dl/extractor/blogger.py b/gallery_dl/extractor/blogger.py
index d2395daa..33d0ed39 100644
--- a/gallery_dl/extractor/blogger.py
+++ b/gallery_dl/extractor/blogger.py
@@ -40,7 +40,7 @@ class BloggerExtractor(BaseExtractor):
         blog = self.api.blog_by_url("http://" + self.blog)
         blog["pages"] = blog["pages"]["totalItems"]
         blog["posts"] = blog["posts"]["totalItems"]
-        blog["date"] = self.parse_datetime(blog["published"])
+        blog["date"] = self.parse_datetime_iso(blog["published"])
         del blog["selfLink"]
 
         findall_image = util.re(
@@ -65,7 +65,7 @@ class BloggerExtractor(BaseExtractor):
             post["author"] = post["author"]["displayName"]
             post["replies"] = post["replies"]["totalItems"]
             post["content"] = text.remove_html(content)
-            post["date"] = self.parse_datetime(post["published"])
+            post["date"] = self.parse_datetime_iso(post["published"])
             del post["selfLink"]
             del post["blog"]
 
diff --git a/gallery_dl/extractor/cien.py b/gallery_dl/extractor/cien.py
index 2679b4e6..ff3474b8 100644
--- a/gallery_dl/extractor/cien.py
+++ b/gallery_dl/extractor/cien.py
@@ -61,7 +61,7 @@ class CienArticleExtractor(CienExtractor):
         post["post_url"] = url
         post["post_id"] = text.parse_int(post_id)
         post["count"] = len(files)
-        post["date"] = self.parse_datetime(post["datePublished"])
+        post["date"] = self.parse_datetime_iso(post["datePublished"])
 
         try:
             post["author"]["id"] = text.parse_int(author_id)
diff --git a/gallery_dl/extractor/deviantart.py b/gallery_dl/extractor/deviantart.py
index aba5401f..79c88a48 100644
--- a/gallery_dl/extractor/deviantart.py
+++ b/gallery_dl/extractor/deviantart.py
@@ -1187,7 +1187,7 @@ class DeviantartStatusExtractor(DeviantartExtractor):
             deviation["username"] = deviation["author"]["username"]
             deviation["_username"] = deviation["username"].lower()
 
-        deviation["date"] = d = self.parse_datetime(deviation["ts"])
+        deviation["date"] = d = self.parse_datetime_iso(deviation["ts"])
         deviation["published_time"] = int(dt.to_ts(d))
 
         deviation["da_category"] = "Status"
diff --git a/gallery_dl/extractor/discord.py b/gallery_dl/extractor/discord.py
index 4284233e..b5af8760 100644
--- a/gallery_dl/extractor/discord.py
+++ b/gallery_dl/extractor/discord.py
@@ -72,9 +72,7 @@ class DiscordExtractor(Extractor):
                 "author_files": [],
                 "message": self.extract_message_text(message),
                 "message_id": message["id"],
-                "date": self.parse_datetime(
-                    message["timestamp"], "%Y-%m-%dT%H:%M:%S.%f%z"
-                ),
+                "date": self.parse_datetime_iso(message["timestamp"]),
                 "files": []
             })
 
diff --git a/gallery_dl/extractor/fanbox.py b/gallery_dl/extractor/fanbox.py
index f2fbe188..18747b0a 100644
--- a/gallery_dl/extractor/fanbox.py
+++ b/gallery_dl/extractor/fanbox.py
@@ -128,7 +128,7 @@ class FanboxExtractor(Extractor):
                         if file.get("extension", "").lower() in exts
                     ]
 
-        post["date"] = self.parse_datetime(post["publishedDatetime"])
+        post["date"] = self.parse_datetime_iso(post["publishedDatetime"])
         post["text"] = content_body.get("text") if content_body else None
         post["isCoverImage"] = False
 
diff --git a/gallery_dl/extractor/hatenablog.py b/gallery_dl/extractor/hatenablog.py
index adb31aa1..a6d2d329 100644
--- a/gallery_dl/extractor/hatenablog.py
+++ b/gallery_dl/extractor/hatenablog.py
@@ -34,7 +34,7 @@ class HatenablogExtractor(Extractor):
 
     def _handle_article(self, article: str):
         extr = text.extract_from(article)
-        date = self.parse_datetime(extr('<time datetime="', '"'))
+        date = self.parse_datetime_iso(extr('<time datetime="', '"'))
         entry_link = text.unescape(extr('<a href="', '"'))
         entry = entry_link.partition("/entry/")[2]
         title = text.unescape(extr('>', '<'))
diff --git a/gallery_dl/extractor/hentaifoundry.py b/gallery_dl/extractor/hentaifoundry.py
index b3df0dbc..b780c650 100644
--- a/gallery_dl/extractor/hentaifoundry.py
+++ b/gallery_dl/extractor/hentaifoundry.py
@@ -86,7 +86,7 @@ class HentaifoundryExtractor(Extractor):
                 .replace("\r\n", "\n")),
             "ratings"    : [text.unescape(r) for r in text.extract_iter(extr(
                 "class='ratings_box'", "</div>"), "title='", "'")],
-            "date"       : self.parse_datetime(extr("datetime='", "'")),
+            "date"       : self.parse_datetime_iso(extr("datetime='", "'")),
             "views"      : text.parse_int(extr(">Views</span>", "<")),
             "score"      : text.parse_int(extr(">Vote Score</span>", "<")),
             "media"      : text.unescape(extr(">Media</span>", "<").strip()),
diff --git a/gallery_dl/extractor/imgur.py b/gallery_dl/extractor/imgur.py
index 61e090fd..7dac2b35 100644
--- a/gallery_dl/extractor/imgur.py
+++ b/gallery_dl/extractor/imgur.py
@@ -38,7 +38,7 @@ class ImgurExtractor(Extractor):
 
         image["url"] = url = \
             f"https://i.imgur.com/{image['id']}.{image['ext']}"
-        image["date"] = self.parse_datetime(image["created_at"])
+        image["date"] = self.parse_datetime_iso(image["created_at"])
         image["_http_validate"] = self._validate
         text.nameext_from_url(url, image)
 
@@ -106,7 +106,7 @@ class ImgurAlbumExtractor(ImgurExtractor):
 
         del album["media"]
         count = len(images)
-        album["date"] = self.parse_datetime(album["created_at"])
+        album["date"] = self.parse_datetime_iso(album["created_at"])
 
         try:
             del album["ad_url"]
diff --git a/gallery_dl/extractor/livedoor.py b/gallery_dl/extractor/livedoor.py
index eaaf34bf..66d9dcf3 100644
--- a/gallery_dl/extractor/livedoor.py
+++ b/gallery_dl/extractor/livedoor.py
@@ -45,7 +45,7 @@ class LivedoorExtractor(Extractor):
             "title"      : text.unescape(extr('dc:title="', '"')),
             "categories" : extr('dc:subject="', '"').partition(",")[::2],
             "description": extr('dc:description="', '"'),
-            "date"       : self.parse_datetime(extr('dc:date="', '"')),
+            "date"       : self.parse_datetime_iso(extr('dc:date="', '"')),
             "tags"       : text.split_html(tags)[1:] if tags else [],
             "user"       : self.user,
             "body"       : body,
diff --git a/gallery_dl/extractor/mangadex.py b/gallery_dl/extractor/mangadex.py
index aed84b46..20933be7 100644
--- a/gallery_dl/extractor/mangadex.py
+++ b/gallery_dl/extractor/mangadex.py
@@ -68,7 +68,7 @@ class MangadexExtractor(Extractor):
             "chapter" : text.parse_int(chnum),
             "chapter_minor": f"{sep}{minor}",
             "chapter_id": chapter["id"],
-            "date"    : self.parse_datetime(cattributes["publishAt"]),
+            "date"    : self.parse_datetime_iso(cattributes["publishAt"]),
             "group"   : [group["attributes"]["name"]
                          for group in relationships["scanlation_group"]],
             "lang"    : lang,
@@ -109,8 +109,8 @@ class MangadexCoversExtractor(MangadexExtractor):
             "cover"   : cattributes["fileName"],
             "lang"    : cattributes.get("locale"),
             "volume"  : text.parse_int(cattributes["volume"]),
-            "date"    : self.parse_datetime(cattributes["createdAt"]),
-            "date_updated": self.parse_datetime(cattributes["updatedAt"]),
+            "date"    : self.parse_datetime_iso(cattributes["createdAt"]),
+            "date_updated": self.parse_datetime_iso(cattributes["updatedAt"]),
         }
 
 
@@ -454,7 +454,7 @@ def _manga_info(self, uuid):
         "manga_id": manga["id"],
         "manga_titles": [t.popitem()[1]
                          for t in mattr.get("altTitles") or ()],
-        "manga_date"  : self.parse_datetime(mattr.get("createdAt")),
+        "manga_date"  : self.parse_datetime_iso(mattr.get("createdAt")),
         "description" : (mattr["description"].get("en") or
                          next(iter(mattr["description"].values()), "")),
         "demographic": mattr.get("publicationDemographic"),
diff --git a/gallery_dl/extractor/mastodon.py b/gallery_dl/extractor/mastodon.py
index 03d2ce44..0b78beaf 100644
--- a/gallery_dl/extractor/mastodon.py
+++ b/gallery_dl/extractor/mastodon.py
@@ -64,8 +64,7 @@ class MastodonExtractor(BaseExtractor):
 
             status["count"] = len(attachments)
             status["tags"] = [tag["name"] for tag in status["tags"]]
-            status["date"] = self.parse_datetime(
-                status["created_at"][:19], "%Y-%m-%dT%H:%M:%S")
+            status["date"] = self.parse_datetime_iso(status["created_at"][:19])
 
             yield Message.Directory, status
             for status["num"], media in enumerate(attachments, 1):
@@ -319,10 +318,8 @@ class MastodonAPI():
             if code == 404:
                 raise exception.NotFoundError()
             if code == 429:
-                self.extractor.wait(until=self.parse_datetime(
-                    response.headers["x-ratelimit-reset"],
-                    "%Y-%m-%dT%H:%M:%S.%fZ",
-                ))
+                self.extractor.wait(until=self.parse_datetime_iso(
+                    response.headers["x-ratelimit-reset"]))
                 continue
             raise exception.AbortExtraction(response.json().get("error"))
 
diff --git a/gallery_dl/extractor/newgrounds.py b/gallery_dl/extractor/newgrounds.py
index 13a85624..58e07130 100644
--- a/gallery_dl/extractor/newgrounds.py
+++ b/gallery_dl/extractor/newgrounds.py
@@ -9,7 +9,7 @@
 """Extractors for https://www.newgrounds.com/"""
 
 from .common import Extractor, Message, Dispatch
-from .. import text, util, exception
+from .. import text, util, dt, exception
 from ..cache import cache
 import itertools
 
@@ -218,7 +218,7 @@ class NewgroundsExtractor(Extractor):
             "description": text.unescape(extr(':description" content="', '"')),
             "type"       : "art",
             "_type"      : "i",
-            "date"       : self.parse_datetime(extr(
+            "date"       : dt.parse_compat(extr(
                 'itemprop="datePublished" content="', '"')),
             "rating"     : extr('class="rated-', '"'),
             "url"        : full('src="', '"'),
@@ -268,7 +268,7 @@ class NewgroundsExtractor(Extractor):
             "description": text.unescape(extr(':description" content="', '"')),
             "type"       : "audio",
             "_type"      : "a",
-            "date"       : self.parse_datetime(extr(
+            "date"       : dt.parse_compat(extr(
                 'itemprop="datePublished" content="', '"')),
             "url"        : extr('{"url":"', '"').replace("\\/", "/"),
             "index"      : text.parse_int(index),
@@ -287,7 +287,7 @@ class NewgroundsExtractor(Extractor):
             src = src.replace("\\/", "/")
             formats = ()
             type = extr(',"description":"', '"')
-            date = self.parse_datetime(extr(
+            date = dt.parse_compat(extr(
                 'itemprop="datePublished" content="', '"'))
             if type:
                 type = type.rpartition(" ")[2].lower()
diff --git a/gallery_dl/extractor/nijie.py b/gallery_dl/extractor/nijie.py
index 69f519ba..f1ff2ec6 100644
--- a/gallery_dl/extractor/nijie.py
+++ b/gallery_dl/extractor/nijie.py
@@ -9,7 +9,7 @@
 """Extractors for nijie instances"""
 
 from .common import BaseExtractor, Message, Dispatch, AsynchronousMixin
-from .. import text, exception
+from .. import text, dt, exception
 from ..cache import cache
 
 
@@ -82,8 +82,9 @@ class NijieExtractor(AsynchronousMixin, BaseExtractor):
             "title"      : keywords[0].strip(),
             "description": text.unescape(extr(
                 '"description": "', '"').replace("&amp;", "&")),
-            "date"       : self.parse_datetime(extr(
-                '"datePublished": "', '"'), "%a %b %d %H:%M:%S %Y", 9),
+            "date"       : dt.parse(extr(
+                '"datePublished": "', '"'), "%a %b %d %H:%M:%S %Y"
+            ) - dt.timedelta(hours=9),
             "artist_id"  : text.parse_int(extr('/members.php?id=', '"')),
             "artist_name": keywords[1],
             "tags"       : keywords[2:-1],
@@ -101,9 +102,9 @@ class NijieExtractor(AsynchronousMixin, BaseExtractor):
             "artist_id"  : text.parse_int(extr('members.php?id=', '"')),
             "artist_name": keywords[1],
             "tags"       : keywords[2:-1],
-            "date"       : self.parse_datetime(extr(
-                "itemprop='datePublished' content=", "<").rpartition(">")[2],
-                "%Y-%m-%d %H:%M:%S", 9),
+            "date"       : dt.parse_iso(extr(
+                "itemprop='datePublished' content=", "<").rpartition(">")[2]
+            ) - dt.timedelta(hours=9),
         }
 
     def _extract_images(self, image_id, page):
diff --git a/gallery_dl/extractor/postmill.py b/gallery_dl/extractor/postmill.py
index 739ff3fa..2f9af413 100644
--- a/gallery_dl/extractor/postmill.py
+++ b/gallery_dl/extractor/postmill.py
@@ -31,7 +31,7 @@ class PostmillExtractor(BaseExtractor):
 
             title = text.unescape(extr(
                 '<meta property="og:title" content="', '">'))
-            date = self.parse_datetime(extr(
+            date = self.parse_datetime_iso(extr(
                 '<meta property="og:article:published_time" content="', '">'))
             username = extr(
                 '<meta property="og:article:author" content="', '">')
diff --git a/gallery_dl/extractor/reactor.py b/gallery_dl/extractor/reactor.py
index 74b700fb..fb508506 100644
--- a/gallery_dl/extractor/reactor.py
+++ b/gallery_dl/extractor/reactor.py
@@ -97,7 +97,7 @@ class ReactorExtractor(BaseExtractor):
                 return
 
         num = 0
-        date = self.parse_datetime(data["datePublished"])
+        date = self.parse_datetime_iso(data["datePublished"])
         user = data["author"]["name"]
         description = text.unescape(data["description"])
         title, _, tags = text.unescape(data["headline"]).partition(" / ")
diff --git a/gallery_dl/extractor/sankakucomplex.py b/gallery_dl/extractor/sankakucomplex.py
index 4f98559e..5426f934 100644
--- a/gallery_dl/extractor/sankakucomplex.py
+++ b/gallery_dl/extractor/sankakucomplex.py
@@ -40,7 +40,7 @@ class SankakucomplexArticleExtractor(SankakucomplexExtractor):
                 extr('property="og:title" content="', '"')),
             "description": text.unescape(
                 extr('property="og:description" content="', '"')),
-            "date"       : self.parse_datetime(
+            "date"       : self.parse_datetime_iso(
                 extr('property="article:published_time" content="', '"')),
         }
         content = extr('<div class="entry-content">', '</article>')
diff --git a/gallery_dl/extractor/simpcity.py b/gallery_dl/extractor/simpcity.py
index 90088ab0..3a6bf38c 100644
--- a/gallery_dl/extractor/simpcity.py
+++ b/gallery_dl/extractor/simpcity.py
@@ -98,7 +98,7 @@ class SimpcityExtractor(Extractor):
             "id"   : url_t[url_t.rfind(".")+1:-1],
             "url"  : url_t,
             "title": schema["headline"],
-            "date" : self.parse_datetime(schema["datePublished"]),
+            "date" : self.parse_datetime_iso(schema["datePublished"]),
             "views": stats[0]["userInteractionCount"],
             "posts": stats[1]["userInteractionCount"],
             "tags" : (schema["keywords"].split(", ")
@@ -119,7 +119,7 @@ class SimpcityExtractor(Extractor):
             "author": extr('data-author="', '"'),
             "id": extr('data-content="post-', '"'),
             "author_url": extr('itemprop="url" content="', '"'),
-            "date": self.parse_datetime(extr('datetime="', '"')),
+            "date": self.parse_datetime_iso(extr('datetime="', '"')),
             "content": extr('<div itemprop="text">',
                             '<div class="js-selectToQuote').strip(),
         }
diff --git a/gallery_dl/extractor/tapas.py b/gallery_dl/extractor/tapas.py
index 9113fed9..accf0ec9 100644
--- a/gallery_dl/extractor/tapas.py
+++ b/gallery_dl/extractor/tapas.py
@@ -89,7 +89,7 @@ class TapasEpisodeExtractor(TapasExtractor):
 
         html = data["html"]
         episode["series"] = self._extract_series(html)
-        episode["date"] = self.parse_datetime(episode["publish_date"])
+        episode["date"] = self.parse_datetime_iso(episode["publish_date"])
         yield Message.Directory, episode
 
         if episode["book"]:
diff --git a/gallery_dl/extractor/telegraph.py b/gallery_dl/extractor/telegraph.py
index a70bb1f9..ab77b311 100644
--- a/gallery_dl/extractor/telegraph.py
+++ b/gallery_dl/extractor/telegraph.py
@@ -27,9 +27,8 @@ class TelegraphGalleryExtractor(GalleryExtractor):
                 'property="og:title" content="', '"')),
             "description": text.unescape(extr(
                 'property="og:description" content="', '"')),
-            "date": self.parse_datetime(extr(
-                'property="article:published_time" content="', '"'),
-                "%Y-%m-%dT%H:%M:%S%z"),
+            "date": self.parse_datetime_iso(extr(
+                'property="article:published_time" content="', '"')),
             "author": text.unescape(extr(
                 'property="article:author" content="', '"')),
             "post_url": text.unescape(extr(
diff --git a/gallery_dl/extractor/tungsten.py b/gallery_dl/extractor/tungsten.py
index e53cfaa2..6b56035f 100644
--- a/gallery_dl/extractor/tungsten.py
+++ b/gallery_dl/extractor/tungsten.py
@@ -23,7 +23,7 @@ class TungstenExtractor(Extractor):
     def items(self):
         for post in self.posts():
             url = post["original_url"]
-            post["date"] = self.parse_datetime(post["created_at"])
+            post["date"] = self.parse_datetime_iso(post["created_at"])
             post["filename"] = url[url.rfind("/")+1:]
             post["extension"] = "webp"
             yield Message.Directory, post
diff --git a/gallery_dl/extractor/unsplash.py b/gallery_dl/extractor/unsplash.py
index 9d9702af..f8a82585 100644
--- a/gallery_dl/extractor/unsplash.py
+++ b/gallery_dl/extractor/unsplash.py
@@ -41,7 +41,7 @@ class UnsplashExtractor(Extractor):
             if metadata:
                 photo.update(metadata)
             photo["extension"] = "jpg"
-            photo["date"] = self.parse_datetime(photo["created_at"])
+            photo["date"] = self.parse_datetime_iso(photo["created_at"])
             if "tags" in photo:
                 photo["tags"] = [t["title"] for t in photo["tags"]]
 
diff --git a/gallery_dl/extractor/weasyl.py b/gallery_dl/extractor/weasyl.py
index 48c26f77..333113b8 100644
--- a/gallery_dl/extractor/weasyl.py
+++ b/gallery_dl/extractor/weasyl.py
@@ -24,8 +24,7 @@ class WeasylExtractor(Extractor):
         # Some submissions don't have content and can be skipped
         if "submission" in data["media"]:
             data["url"] = data["media"]["submission"][0]["url"]
-            data["date"] = self.parse_datetime(
-                data["posted_at"][:19], "%Y-%m-%dT%H:%M:%S")
+            data["date"] = self.parse_datetime_iso(data["posted_at"][:19])
             text.nameext_from_url(data["url"], data)
             return True
         return False
@@ -42,7 +41,7 @@ class WeasylExtractor(Extractor):
             f"{self.root}/api/journals/{journalid}/view")
         data["extension"] = "html"
         data["html"] = "text:" + data["content"]
-        data["date"] = self.parse_datetime(data["posted_at"])
+        data["date"] = self.parse_datetime_iso(data["posted_at"])
         return data
 
     def submissions(self, owner_login, folderid=None):
diff --git a/gallery_dl/extractor/zerochan.py b/gallery_dl/extractor/zerochan.py
index 602f994b..35222da9 100644
--- a/gallery_dl/extractor/zerochan.py
+++ b/gallery_dl/extractor/zerochan.py
@@ -76,7 +76,7 @@ class ZerochanExtractor(BooruExtractor):
         data = {
             "id"      : text.parse_int(entry_id),
             "file_url": jsonld["contentUrl"],
-            "date"    : self.parse_datetime(jsonld["datePublished"]),
+            "date"    : self.parse_datetime_iso(jsonld["datePublished"]),
             "width"   : text.parse_int(jsonld["width"][:-3]),
             "height"  : text.parse_int(jsonld["height"][:-3]),
             "size"    : text.parse_bytes(jsonld["contentSize"][:-1]),