diff --git a/redmine_reporter/cli.py b/redmine_reporter/cli.py
index 7709150..482187e 100644
--- a/redmine_reporter/cli.py
+++ b/redmine_reporter/cli.py
@@ -25,20 +25,27 @@ def parse_date_range(date_arg: str) -> tuple[str, str]:
 
     from_date, to_date = parts[0].strip(), parts[1].strip()
     date_pattern = r"\d{4}-\d{2}-\d{2}"
-    if not re.fullmatch(date_pattern, from_date) or not re.fullmatch(
-        date_pattern, to_date
+    datetime_pattern = r"\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}"
+    if re.fullmatch(date_pattern, from_date) and re.fullmatch(date_pattern, to_date):
+        fmt = "%Y-%m-%d"
+    elif re.fullmatch(datetime_pattern, from_date) and re.fullmatch(
+        datetime_pattern, to_date
     ):
+        fmt = "%Y-%m-%dT%H:%M:%S"
+    else:
         raise ValueError("Date range must be in format YYYY-MM-DD--YYYY-MM-DD")
 
     try:
-        start = datetime.strptime(from_date, "%Y-%m-%d").date()
-        end = datetime.strptime(to_date, "%Y-%m-%d").date()
+        start = datetime.strptime(from_date, fmt)
+        end = datetime.strptime(to_date, fmt)
     except ValueError as e:
         raise ValueError("Date range contains invalid calendar date") from e
 
     if start > end:
         raise ValueError("Date range start must be less than or equal to end")
 
+    if fmt == "%Y-%m-%d":
+        return start.date().isoformat(), end.date().isoformat()
     return start.isoformat(), end.isoformat()
 
 
diff --git a/tests/test_cli.py b/tests/test_cli.py
index c1085be..b684cc2 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -30,6 +30,10 @@ def _reset_config_overrides():
     [
         ("2026-01-01--2026-01-31", ("2026-01-01", "2026-01-31")),
         (" 2026-01-01 -- 2026-01-31 ", ("2026-01-01", "2026-01-31")),
+        (
+            "2026-06-01T00:00:00--2026-06-30T23:59:59",
+            ("2026-06-01T00:00:00", "2026-06-30T23:59:59"),
+        ),
     ],
 )
 def test_parse_date_range_valid(date_arg, expected):
@@ -43,6 +47,9 @@ def test_parse_date_range_valid(date_arg, expected):
         "2026-1-01--2026-01-31",
         "2026-02-30--2026-03-01",
         "2026-02-01--2026-01-31",
+        "2026-06-01T25:00:00--2026-06-30T23:59:59",
+        "2026-06-01--2026-06-30T23:59:59",
+        "2026-06-30T23:59:59--2026-06-01T00:00:00",
     ],
 )
 def test_parse_date_range_invalid(date_arg):
@@ -1372,11 +1379,6 @@ class TestReportNoTimeIntegration:
 # ---------------------------------------------------------------------------
 
 
-@pytest.mark.xfail(
-    strict=True,
-    reason="bug #59: parse_date_range rejects datetime range produced by "
-    "dynamic period with precision=datetime when --date is omitted",
-)
 @mock.patch.dict(os.environ, VALID_ENV, clear=True)
 @mock.patch("redmine_reporter.cli.fetch_issues_with_spent_time")
 def test_cli_dynamic_datetime_period_without_date(mock_fetch, tmp_path):