Implement ser_json_temporal config option

python/pydantic_core/_pydantic_core.pyi

@@ -402,6 +402,7 @@ def to_json(
     exclude_none: bool = False,
     round_trip: bool = False,
     timedelta_mode: Literal['iso8601', 'float'] = 'iso8601',
+    temporal_mode: Literal['iso8601', 'seconds', 'milliseconds'] = 'iso8601',
     bytes_mode: Literal['utf8', 'base64', 'hex'] = 'utf8',
     inf_nan_mode: Literal['null', 'constants', 'strings'] = 'constants',
     serialize_unknown: bool = False,
@@ -425,6 +426,8 @@ def to_json(
         exclude_none: Whether to exclude fields that have a value of `None`.
         round_trip: Whether to enable serialization and validation round-trip support.
         timedelta_mode: How to serialize `timedelta` objects, either `'iso8601'` or `'float'`.
+        temporal_mode: How to serialize datetime like objects, either
+        `'iso8601'` or `'seconds'` or `'milliseconds'`.
         bytes_mode: How to serialize `bytes` objects, either `'utf8'`, `'base64'`, or `'hex'`.
         inf_nan_mode: How to serialize `Infinity`, `-Infinity` and `NaN` values, either `'null'`, `'constants'`, or `'strings'`.
         serialize_unknown: Attempt to serialize unknown types, `str(value)` will be used, if that fails
@@ -483,6 +486,7 @@ def to_jsonable_python(
     exclude_none: bool = False,
     round_trip: bool = False,
     timedelta_mode: Literal['iso8601', 'float'] = 'iso8601',
+    temporal_mode: Literal['iso8601', 'seconds', 'milliseconds'] = 'iso8601',
     bytes_mode: Literal['utf8', 'base64', 'hex'] = 'utf8',
     inf_nan_mode: Literal['null', 'constants', 'strings'] = 'constants',
     serialize_unknown: bool = False,
@@ -504,6 +508,8 @@ def to_jsonable_python(
         exclude_none: Whether to exclude fields that have a value of `None`.
         round_trip: Whether to enable serialization and validation round-trip support.
         timedelta_mode: How to serialize `timedelta` objects, either `'iso8601'` or `'float'`.
+        temporal_mode: How to serialize datetime like objects, either
+        `'iso8601'` or `'seconds'` or `'milliseconds'`.
         bytes_mode: How to serialize `bytes` objects, either `'utf8'`, `'base64'`, or `'hex'`.
         inf_nan_mode: How to serialize `Infinity`, `-Infinity` and `NaN` values, either `'null'`, `'constants'`, or `'strings'`.
         serialize_unknown: Attempt to serialize unknown types, `str(value)` will be used, if that fails

python/pydantic_core/core_schema.py

@@ -102,6 +102,7 @@ class CoreConfig(TypedDict, total=False):
     allow_inf_nan: bool  # default: True
     # the config options are used to customise serialization to JSON
     ser_json_timedelta: Literal['iso8601', 'float']  # default: 'iso8601'
+    ser_json_temporal: Literal['iso8601', 'seconds', 'milliseconds']  # default: 'iso8601'
     ser_json_bytes: Literal['utf8', 'base64', 'hex']  # default: 'utf8'
     ser_json_inf_nan: Literal['null', 'constants', 'strings']  # default: 'null'
     val_json_bytes: Literal['utf8', 'base64', 'hex']  # default: 'utf8'

src/errors/validation_exception.rs

@@ -340,7 +340,7 @@ impl ValidationError {
         include_context: bool,
         include_input: bool,
     ) -> PyResult<Bound<'py, PyString>> {
-        let state = SerializationState::new("iso8601", "utf8", "constants")?;
+        let state = SerializationState::new("iso8601", "iso8601", "utf8", "constants")?;
         let extra = state.extra(py, &SerMode::Json, None, false, false, true, None, false, None);
         let serializer = ValidationErrorSerializer {
             py,

src/input/datetime.rs

@@ -131,6 +131,93 @@ impl EitherTimedelta<'_> {
             Self::PySubclass(py_timedelta) => pytimedelta_subclass_as_duration(py_timedelta),
         }
     }
+
+    pub fn total_seconds(&self) -> PyResult<f64> {
+        match self {
+            Self::Raw(timedelta) => {
+                let mut days: i64 = i64::from(timedelta.day);
+                let mut seconds: i64 = i64::from(timedelta.second);
+                let mut microseconds = i64::from(timedelta.microsecond);
+                if !timedelta.positive {
+                    days = -days;
+                    seconds = -seconds;
+                    microseconds = -microseconds;
+                }
+
+                let days_seconds = (86_400 * days) + seconds;
+                if let Some(days_seconds_as_micros) = days_seconds.checked_mul(1_000_000) {
+                    let total_microseconds = days_seconds_as_micros + microseconds;
+                    Ok(total_microseconds as f64 / 1_000_000.0)
+                } else {
+                    // Fall back to floating-point operations if the multiplication overflows
+                    let total_seconds = days_seconds as f64 + microseconds as f64 / 1_000_000.0;
+                    Ok(total_seconds)
+                }
+            }
+            Self::PyExact(py_timedelta) => {
+                let days: i64 = py_timedelta.get_days().into(); // -999999999 to 999999999
+                let seconds: i64 = py_timedelta.get_seconds().into(); // 0 through 86399
+                let microseconds = py_timedelta.get_microseconds(); // 0 through 999999
+                let days_seconds = (86_400 * days) + seconds;
+                if let Some(days_seconds_as_micros) = days_seconds.checked_mul(1_000_000) {
+                    let total_microseconds = days_seconds_as_micros + i64::from(microseconds);
+                    Ok(total_microseconds as f64 / 1_000_000.0)
+                } else {
+                    // Fall back to floating-point operations if the multiplication overflows
+                    let total_seconds = days_seconds as f64 + f64::from(microseconds) / 1_000_000.0;
+                    Ok(total_seconds)
+                }
+            }
+            Self::PySubclass(py_timedelta) => py_timedelta
+                .call_method0(intern!(py_timedelta.py(), "total_seconds"))?
+                .extract(),
+        }
+    }
+
+    pub fn total_milliseconds(&self) -> PyResult<f64> {
+        match self {
+            Self::Raw(timedelta) => {
+                let mut days: i64 = i64::from(timedelta.day);
+                let mut seconds: i64 = i64::from(timedelta.second);
+                let mut microseconds = i64::from(timedelta.microsecond);
+                if !timedelta.positive {
+                    days = -days;
+                    seconds = -seconds;
+                    microseconds = -microseconds;
+                }
+
+                let days_seconds = (86_400 * days) + seconds;
+                if let Some(days_seconds_as_micros) = days_seconds.checked_mul(1_000_000) {
+                    let total_microseconds = days_seconds_as_micros + microseconds;
+                    Ok(total_microseconds as f64 / 1_000.0)
+                } else {
+                    // Fall back to floating-point operations if the multiplication overflows
+                    let total_seconds = days_seconds as f64 + microseconds as f64 / 1_000.0;
+                    Ok(total_seconds)
+                }
+            }
+            Self::PyExact(py_timedelta) => {
+                let days: i64 = py_timedelta.get_days().into(); // -999999999 to 999999999
+                let seconds: i64 = py_timedelta.get_seconds().into(); // 0 through 86399
+                let microseconds = py_timedelta.get_microseconds(); // 0 through 999999
+                let days_seconds = (86_400 * days) + seconds;
+                if let Some(days_seconds_as_micros) = days_seconds.checked_mul(1_000_000) {
+                    let total_microseconds = days_seconds_as_micros + i64::from(microseconds);
+                    Ok(total_microseconds as f64 / 1_000.0)
+                } else {
+                    // Fall back to floating-point operations if the multiplication overflows
+                    let total_milliseconds = days_seconds as f64 * 1_000.0 + f64::from(microseconds) / 1_000.0;
+                    Ok(total_milliseconds)
+                }
+            }
+            Self::PySubclass(py_timedelta) => {
+                let total_seconds: f64 = py_timedelta
+                    .call_method0(intern!(py_timedelta.py(), "total_seconds"))?
+                    .extract()?;
+                Ok(total_seconds / 1000.0)
+            }
+        }
+    }
 }
 
 impl<'py> TryFrom<&'_ Bound<'py, PyAny>> for EitherTimedelta<'py> {