diff --git a/redmine_reporter/cli.py b/redmine_reporter/cli.py
index 0f749ea..7166db4 100644
--- a/redmine_reporter/cli.py
+++ b/redmine_reporter/cli.py
@@ -23,8 +23,9 @@ def main(argv: Optional[List[str]] = None) -> int:
     )
     parser.add_argument(
         "--date",
-        default=Config.DEFAULT_DATE_RANGE,
-        help="Date range in format YYYY-MM-DD--YYYY-MM-DD (default: %(default)s)"
+        default=Config.get_default_date_range(),
+        # help="Date range in format YYYY-MM-DD--YYYY-MM-DD (default: %(default)s)"
+        help="Date range in format YYYY-MM-DD--YYYY-MM-DD (default from .env or %(default)s)"
     )
     parser.add_argument(
         "--compact",
diff --git a/redmine_reporter/config.py b/redmine_reporter/config.py
index 9e2f9b3..b943837 100644
--- a/redmine_reporter/config.py
+++ b/redmine_reporter/config.py
@@ -9,7 +9,15 @@ class Config:
     REDMINE_URL = os.getenv("REDMINE_URL", "").rstrip("/")
     REDMINE_USER = os.getenv("REDMINE_USER")
     REDMINE_PASSWORD = os.getenv("REDMINE_PASSWORD")
-    DEFAULT_DATE_RANGE = "2025-12-19--2026-01-31"
+    DEFAULT_FROM_DATE = os.getenv("DEFAULT_FROM_DATE")
+    DEFAULT_TO_DATE = os.getenv("DEFAULT_TO_DATE")
+
+    @classmethod
+    def get_default_date_range(cls) -> str:
+        if cls.DEFAULT_FROM_DATE and cls.DEFAULT_TO_DATE:
+            return f"{cls.DEFAULT_FROM_DATE}--{cls.DEFAULT_TO_DATE}"
+        # fallback hardcoded
+        return "2025-12-19--2026-01-31"
 
     @classmethod
     def validate(cls) -> None: