Implement datetime handling in pytest-bdd

- This was awful and convoluted

Co-authored-by: Micah Jerome Ellison <micah.jerome.ellison@gmail.com>

tests/unit/test_time.py

@@ -0,0 +1,22 @@
+import datetime
+
+from jrnl import time
+
+
+def test_default_hour_is_added():
+    assert time.parse(
+        "2020-06-20", inclusive=False, default_hour=9, default_minute=0, bracketed=False
+    ) == datetime.datetime(2020, 6, 20, 9)
+
+
+def test_default_minute_is_added():
+    assert (
+        time.parse(
+            "2020-06-20",
+            inclusive=False,
+            default_hour=0,
+            default_minute=30,
+            bracketed=False,
+        )
+        == datetime.datetime(2020, 6, 20, 0, 30)
+    )