diff --git a/pydantic/datetime_parse.py b/pydantic/datetime_parse.py
index 7bcb13a..f0070f7 100644
--- a/pydantic/datetime_parse.py
+++ b/pydantic/datetime_parse.py
@@ -91,7 +91,7 @@ def parse_date(value: Union[date, StrIntFloat]) -> date:
         return value
 
     number = get_numeric(value)
-    if number:
+    if number is not None:
         return from_unix_seconds(number).date()
 
     match = date_re.match(value)
@@ -139,7 +139,7 @@ def parse_datetime(value: Union[datetime, StrIntFloat]) -> datetime:
         return value
 
     number = get_numeric(value)
-    if number:
+    if number is not None:
         return from_unix_seconds(number)
 
     match = datetime_re.match(value)
diff --git a/tests/test_datetime_parse.py b/tests/test_datetime_parse.py
index 1b35437..9423755 100644
--- a/tests/test_datetime_parse.py
+++ b/tests/test_datetime_parse.py
@@ -23,6 +23,7 @@ def create_tz(minutes):
     (1494012444.883309, date(2017, 5, 5)),
     ('1494012444', date(2017, 5, 5)),
     (1494012444, date(2017, 5, 5)),
+    (0, date(1970, 1, 1)),
     ('2012-04-23', date(2012, 4, 23)),
     ('2012-4-9', date(2012, 4, 9)),
     (date(2012, 4, 9), date(2012, 4, 9)),
@@ -76,6 +77,7 @@ def test_time_parsing(value, result):
     ('2012-04-23T10:20:30.400+02', datetime(2012, 4, 23, 10, 20, 30, 400000, create_tz(120))),
     ('2012-04-23T10:20:30.400-02', datetime(2012, 4, 23, 10, 20, 30, 400000, create_tz(-120))),
     (datetime(2017, 5, 5), datetime(2017, 5, 5)),
+    (0, datetime(1970, 1, 1, 0, 0, 0, tzinfo=timezone.utc)),
     # Invalid inputs
     ('x20120423091500', ValueError),
     ('2012-04-56T09:15:90', ValueError),