Remove `datetime.time` to `absl::Time` conversion.

This conversion muddles the concepts of

* a particular point of time in a day, **independent of a particular date**, and

* a particular date + time.

This conversion was added only recently, but after more consideration, that was a mistake.

PiperOrigin-RevId: 529062347

pybind11_abseil/absl_casters.h

@@ -191,8 +191,6 @@ struct type_caster<absl::Time> {
 
   // Conversion part 1 (Python->C++)
   bool load(handle src, bool convert) {
-    // As early as possible to avoid mid-process surprises.
-    internal::EnsurePyDateTime_IMPORT();
     if (convert) {
       if (PyLong_Check(src.ptr())) {
         value = absl::FromUnixSeconds(src.cast<int64_t>());
@@ -203,20 +201,6 @@ struct type_caster<absl::Time> {
             src.cast<double>()));
         return true;
       }
-      if (PyTime_Check(src.ptr())) {
-        // Adapted from absl/python/time.cc
-        // Copyright 2018 The Abseil Authors.
-        timeval tv{PyDateTime_TIME_GET_HOUR(src.ptr()) * 3600 +
-                       PyDateTime_TIME_GET_MINUTE(src.ptr()) * 60 +
-                       PyDateTime_TIME_GET_SECOND(src.ptr()),
-                   PyDateTime_TIME_GET_MICROSECOND(src.ptr())};
-        value = absl::TimeFromTimeval(tv);
-        int utcoffset;
-        if (PyTzOffset(src.ptr(), &utcoffset)) {
-          value += absl::Seconds(utcoffset);
-        }
-        return true;
-      }
     }
     if (!hasattr(src, "year") || !hasattr(src, "month") ||
         !hasattr(src, "day")) {
@@ -269,25 +253,6 @@ struct type_caster<absl::Time> {
     auto py_datetime = py_from_timestamp(as_seconds, "tz"_a = py_timezone);
     return py_datetime.release();
   }
-
- private:
-  // Adapted from absl/python/time.cc
-  // Copyright 2018 The Abseil Authors.
-  bool PyTzOffset(PyObject* datetime, int* utcoffset) {
-    PyObject* offset = PyObject_CallMethod(datetime, "utcoffset", nullptr);
-
-    if (!offset || !PyDelta_Check(offset)) {
-      return false;
-    }
-
-    if (utcoffset) {
-      *utcoffset = PyDateTime_DELTA_GET_SECONDS(offset) +
-                   PyDateTime_DELTA_GET_DAYS(offset) * 24 * 3600;
-    }
-
-    Py_DECREF(offset);
-    return true;
-  }
 };
 
 template <typename CivilTimeUnitType>

pybind11_abseil/tests/absl_test.py

@@ -248,10 +248,8 @@ class AbslTimeTest(parameterized.TestCase):
     with self.assertRaises(TypeError):
       absl_example.roundtrip_timezone('Not a timezone')
 
-  @parameterized.parameters(
-      absl_example.roundtrip_duration, absl_example.roundtrip_time
-  )
-  def test_from_datetime_time(self, rt):
+  def test_from_datetime_time(self):
+    rt = absl_example.roundtrip_duration
     dt1 = rt(dt_time(h=13))
     dt2 = rt(dt_time(h=15))
     self.assertEqual((dt2 - dt1).seconds, 2 * 3600)
@@ -267,9 +265,7 @@ class AbslTimeTest(parameterized.TestCase):
     dt1 = rt(dt_time(tzoff=9))
     dt2 = rt(dt_time(tzoff=19))
     # Conversion from datetime.time to absl::Duration ignores tzinfo!
-    self.assertEqual(
-        (dt2 - dt1).seconds, 0 if rt is absl_example.roundtrip_duration else 10
-    )
+    self.assertEqual((dt2 - dt1).seconds, 0)
 
 
 def make_read_only_numpy_array():