Changed position of empty string warning

Author: jhendricks487

pandas/_libs/tslibs/timestamps.pyx

@@ -2635,14 +2635,6 @@ class Timestamp(_Timestamp):
         elif not (999 >= nanosecond >= 0):
             raise ValueError("nanosecond must be in 0..999")
 
-        if ts_input == "":
-            warnings.warn(
-                "Passing an empty string to Timestamp is deprecated and will raise "
-                "a ValueError in a future version.",
-                FutureWarning,
-                stacklevel = 2
-            )
-
         ts = convert_to_tsobject(ts_input, tzobj, unit, 0, 0, nanosecond)
 
         if ts.value == NPY_NAT:
@@ -2653,6 +2645,14 @@ class Timestamp(_Timestamp):
                 "Passed data is timezone-aware, incompatible with 'tz=None'."
             )
 
+        if ts_input == "":
+            warnings.warn(
+                "Passing an empty string to Timestamp is deprecated and will raise "
+                "a ValueError in a future version.",
+                FutureWarning,
+                stacklevel = 2
+            )
+
         return create_timestamp_from_ts(ts.value, ts.dts, ts.tzinfo, ts.fold, ts.creso)
 
     def _round(self, freq, mode, ambiguous="raise", nonexistent="raise"):

pandas/tests/scalar/timestamp/test_constructors.py

@@ -1078,7 +1078,6 @@ def test_non_nano_value():
     assert result == -52700112000
 
 
-@pytest.mark.filterwarnings("ignore:Passing an empty string to Timestamp")
 @pytest.mark.parametrize("na_value", [None, np.nan, np.datetime64("NaT"), NaT, NA])
 def test_timestamp_constructor_na_value(na_value):
     # GH45481