feat(cli): add natural language date parsing via dateparser

- Add _parse_natural() to utils.py using dateparser as a fallback when
  structured date formats (YYYY-MM-DD, MM-DD, DD-MM) don't match
- Supports expressions like 'today', 'yesterday', 'monday', '3 days ago'
- Change day argument to nargs='*' and join tokens so unquoted
  multi-word expressions like: uv run timesheets 3 days ago work correctly
- Pin dateparser to English to avoid locale-dependent behaviour
- Update tests to cover natural language cases and fix test_last_monday
  (dateparser does not support 'last monday'; use 'monday' instead)

pyproject.toml

@@ -8,6 +8,7 @@ authors = [
 ]
 requires-python = ">=3.13"
 dependencies = [
+    "dateparser>=1.4.0",
     "joppy>=1.0.2",
 ]
 

src/timesheets/cli.py

@@ -51,12 +51,12 @@ def build_parser() -> argparse.ArgumentParser:
     )
     parser.add_argument(
         "day",
-        nargs="?",
+        nargs="*",
         help=(
-            "Day to extract timesheets for. Accepts YYYY-MM-DD, MM-DD, or DD-MM "
+            "Day to extract timesheets for. Accepts YYYY-MM-DD, MM-DD, DD-MM, "
-            "(- or / as separator). Defaults to today."
+            "or a natural language expression like 'yesterday' or '3 days ago'. "
+            "Defaults to today."
         ),
-        default=None,
     )
     parser.add_argument(
         "--map",
@@ -93,11 +93,13 @@ def main() -> None:
     config_path = args.config if args.config is not None else find_default_config()
     config = load_config(config_path)
 
-    if args.day is None:
+    day_input = " ".join(args.day) if args.day else None
+
+    if day_input is None:
         target_date = date.today()
     else:
         try:
-            target_date = parse_date_arg(args.day)
+            target_date = parse_date_arg(day_input)
         except AmbiguousDateError as e:
             print(f"Error: {e}", file=sys.stderr)
             sys.exit(1)

src/timesheets/utils.py

@@ -63,10 +63,29 @@ def parse_date_arg(value: str) -> date:
             raise ValueError(f"Invalid date: {value!r}")
         return result
 
-    raise ValueError(
+    # Nothing matched structured formats — try natural language
-        f"Unrecognised date format: {value!r}. "
+    return _parse_natural(value)
-        "Expected YYYY-MM-DD, MM-DD, or DD-MM (- or / as separator)."
+
+
+def _parse_natural(value: str) -> date:
+    """
+    Parse a natural language date string using dateparser.
+    Raises ValueError if the string cannot be interpreted.
+    """
+    import dateparser
+
+    result = dateparser.parse(
+        value,
+        languages=["en"],
+        settings={"PREFER_DATES_FROM": "past", "RETURN_AS_TIMEZONE_AWARE": False},
     )
+    if result is None:
+        raise ValueError(
+            f"Could not interpret {value!r} as a date. "
+            "Try a structured format like '2026-05-22' or '05-22', "
+            "or a relative expression like 'today', 'yesterday', 'monday', or '3 days ago'."
+        )
+    return result.date()
 
 
 def parse_duration(duration_str: str) -> float:

tests/test_utils.py

@@ -166,9 +166,39 @@ class TestParseDateArg:
         with pytest.raises(ValueError):
             self._parse("13-32")
 
-    def test_unrecognised_format(self):
+    def test_unrecognised_format_falls_back_to_natural(self):
-        with pytest.raises(ValueError, match="Unrecognised"):
+        # A value that looks nothing like a date should raise via _parse_natural
-            parse_date_arg("not-a-date")
+        with pytest.raises(ValueError):
+            parse_date_arg("not-a-date-at-all-xyz")
 
     def test_whitespace_stripped(self):
         assert parse_date_arg("  2026-05-22  ") == date(2026, 5, 22)
+
+
+class TestParseDateArgNatural:
+    """Tests for natural language fallback via dateparser."""
+
+    def test_today(self):
+        from datetime import date as date_cls
+
+        result = parse_date_arg("today")
+        assert result == date_cls.today()
+
+    def test_yesterday(self):
+        from datetime import date as date_cls
+        from datetime import timedelta
+
+        result = parse_date_arg("yesterday")
+        assert result == date_cls.today() - timedelta(days=1)
+
+    def test_weekday_name(self):
+        from datetime import date as date_cls
+
+        result = parse_date_arg("monday")
+        # Must be a Monday and not in the future
+        assert result.weekday() == 0
+        assert result <= date_cls.today()
+
+    def test_garbage_raises(self):
+        with pytest.raises(ValueError):
+            parse_date_arg("not-a-date-at-all-xyz")

uv.lock

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 ]
 
+[[package]]
+name = "dateparser"
+version = "1.4.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "python-dateutil" },
+    { name = "pytz" },
+    { name = "regex" },
+    { name = "tzlocal" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/46/2d/a0ccdb78788064fa0dc901b8524e50615c42be1d78b78d646d0b28d09180/dateparser-1.4.0.tar.gz", hash = "sha256:97a21840d5ecdf7630c584f673338a5afac5dfe84f647baf4d7e8df98f9354a4", size = 321512, upload-time = "2026-03-26T09:56:10.292Z" }
+wheels = [
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 name = "idna"
 version = "3.16"
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 ]
 
+[[package]]
+name = "python-dateutil"
+version = "2.9.0.post0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "six" },
+]
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 source = { editable = "." }
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 [package.metadata]
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 dev = [
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