diff --git a/jrnl/journals/FolderJournal.py b/jrnl/journals/FolderJournal.py
index 684c4c2e5..cc16926c2 100644
--- a/jrnl/journals/FolderJournal.py
+++ b/jrnl/journals/FolderJournal.py
@@ -18,7 +18,6 @@
 DIGIT_PATTERN = "[0123456789]"
 YEAR_PATTERN = DIGIT_PATTERN * 4
 MONTH_PATTERN = "[01]" + DIGIT_PATTERN
-DAY_PATTERN = "[0-3][0-9].(txt|md)"
 
 
 class Folder(Journal):
@@ -35,7 +34,7 @@ def open(self) -> "Folder":
         self.entries = []
 
         if os.path.exists(self.config["journal"]):
-            filenames = Folder._get_files(self.config["journal"])
+            filenames = Folder._get_files(self, self.config["journal"])
             for filename in filenames:
                 with codecs.open(filename, "r", "utf-8") as f:
                     journal = f.read()
@@ -64,7 +63,7 @@ def write(self) -> None:
                 self.config["journal"],
                 d.strftime("%Y"),
                 d.strftime("%m"),
-                d.strftime("%d") + ".txt",
+                d.strftime("%d") + "." + self.config["extension"],
             )
             dirname = os.path.dirname(filename)
             # create directory if it doesn't exist
@@ -122,12 +121,12 @@ def parse_editable_str(self, edited: str) -> None:
         self.entries = mod_entries
 
     @staticmethod
-    def _get_files(journal_path: str) -> list[str]:
+    def _get_files(self, journal_path: str) -> list[str]:
         """Searches through sub directories starting with journal_path and find all text
         files that look like entries"""
         for year_folder in Folder._get_year_folders(pathlib.Path(journal_path)):
             for month_folder in Folder._get_month_folders(year_folder):
-                yield from Folder._get_day_files(month_folder)
+                yield from Folder._get_day_files(self, month_folder)
 
     @staticmethod
     def _get_year_folders(path: pathlib.Path) -> list[pathlib.Path]:
@@ -144,8 +143,9 @@ def _get_month_folders(path: pathlib.Path) -> list[pathlib.Path]:
         return
 
     @staticmethod
-    def _get_day_files(path: pathlib.Path) -> list[str]:
+    def _get_day_files(self, path: pathlib.Path) -> list[str]:
         for child in path.iterdir():
+            DAY_PATTERN = "[0-3][0-9].(txt|md|" + self.config["extension"] + ")"
             match = re.search(DAY_PATTERN, str(child))
             if (
                 match is not None