added abitity to instanciate date objects

docs/docs/instantiation.md

@@ -135,10 +135,16 @@ and will set the timezone as well or default it to `UTC`.
 
 Finally, if you find yourself inheriting a `DateTime` instance,
 you can create a `DateTime` instance via the `instance()` function.
+This also works with datetime.date instances.
 
 ```python
 >>> dt = datetime(2008, 1, 1)
 >>> p = pendulum.instance(dt)
 >>> print(p)
 '2008-01-01T00:00:00+00:00'
+>>> d = date(2008, 1, 1)
+>>> p = pendulum.instance(d)
+>>> print(p)
+'2008-01-01T00:00:00+00:00'
+
 ```

pendulum/__init__.py

@@ -172,14 +172,17 @@ def instance(
     dt, tz=UTC  # type: _datetime.datetime  # type: Union[str, _Timezone, None]
 ):  # type: (...) -> DateTime
     """
-    Create a DateTime instance from a datetime one.
+    Create a DateTime instance from a datetime or date.
     """
-    if not isinstance(dt, _datetime.datetime):
-        raise ValueError("instance() only accepts datetime objects.")
+    if not isinstance(dt, _datetime.datetime) and not isinstance(dt, _datetime.date):
+        raise ValueError("instance() only accepts datetime and date objects.")
 
     if isinstance(dt, DateTime):
         return dt
 
+    if isinstance(dt, _datetime.date):
+        dt = _datetime.datetime(dt.year, dt.month, dt.day)
+
     tz = dt.tzinfo or tz
 
     # Checking for pytz/tzinfo

tests/datetime/test_construct.py

@@ -4,7 +4,7 @@
 import pendulum
 import pytest
 
-from datetime import datetime
+from datetime import datetime, date
 from dateutil import tz
 from pendulum import DateTime
 from pendulum.tz import timezone
@@ -77,6 +77,11 @@ def test_instance_naive_datetime_defaults_to_utc():
     assert now.timezone_name == "UTC"
 
 
+def test_instance_naive_date():
+    now = pendulum.instance(date.today())
+    assert now.timezone_name == "UTC"
+
+
 def test_instance_timezone_aware_datetime():
     now = pendulum.instance(datetime.now(timezone("Europe/Paris")))
     assert now.timezone_name == "Europe/Paris"