Update Temporal rounding and implement additional methods (#3892)

* Impl methods and update temporal for new rounding

* implement PlainDate until and since methods

* Bump temporal-rs commit

Cargo.lock

@@ -3201,7 +3201,7 @@ checksum = "55937e1799185b12863d447f42597ed69d9928686b8d88a1df17376a097d8369"
 [[package]]
 name = "temporal_rs"
 version = "0.0.2"
-source = "git+https://github.com/boa-dev/temporal.git?rev=c658ac7db4701822cc179d04b56bb9c8fb7e954c#c658ac7db4701822cc179d04b56bb9c8fb7e954c"
+source = "git+https://github.com/boa-dev/temporal.git?rev=cf70b50f90865d2c00fb994b7adf8b9e1bd837b8#cf70b50f90865d2c00fb994b7adf8b9e1bd837b8"
 dependencies = [
  "bitflags 2.6.0",
  "icu_calendar",

Cargo.toml

@@ -115,7 +115,7 @@ intrusive-collections = "0.9.6"
 cfg-if = "1.0.0"
 either = "1.13.0"
 sys-locale = "0.3.1"
-temporal_rs = { git = "https://github.com/boa-dev/temporal.git", rev = "c658ac7db4701822cc179d04b56bb9c8fb7e954c" }
+temporal_rs = { git = "https://github.com/boa-dev/temporal.git", rev = "cf70b50f90865d2c00fb994b7adf8b9e1bd837b8" }
 web-time = "1.1.0"
 criterion = "0.5.1"
 float-cmp = "0.9.0"

core/engine/src/builtins/temporal/duration/mod.rs

@@ -18,7 +18,7 @@ use boa_macros::js_str;
 use boa_profiler::Profiler;
 use temporal_rs::{
     components::Duration as InnerDuration,
-    options::{RelativeTo, RoundingIncrement, TemporalRoundingMode, TemporalUnit},
+    options::{RelativeTo, RoundingIncrement, RoundingOptions, TemporalRoundingMode, TemporalUnit},
 };
 
 use super::{
@@ -389,7 +389,7 @@ impl Duration {
         // 3. Return 𝔽(! DurationSign(duration.[[Years]], duration.[[Months]], duration.[[Weeks]],
         // duration.[[Days]], duration.[[Hours]], duration.[[Minutes]], duration.[[Seconds]],
         // duration.[[Milliseconds]], duration.[[Microseconds]], duration.[[Nanoseconds]])).
-        Ok(duration.inner.sign().into())
+        Ok((duration.inner.sign() as i8).into())
     }
 
     /// 7.3.14 get Temporal.Duration.prototype.blank
@@ -640,10 +640,11 @@ impl Duration {
         // NOTE: 6 & 7 unused in favor of `is_none()`.
         // 6. Let smallestUnitPresent be true.
         // 7. Let largestUnitPresent be true.
+        let mut options = RoundingOptions::default();
 
         // 8. NOTE: The following steps read options and perform independent validation in alphabetical order (ToRelativeTemporalObject reads "relativeTo", ToTemporalRoundingIncrement reads "roundingIncrement" and ToTemporalRoundingMode reads "roundingMode").
         // 9. Let largestUnit be ? GetTemporalUnit(roundTo, "largestUnit", datetime, undefined, « "auto" »).
-        let largest_unit = get_temporal_unit(
+        options.largest_unit = get_temporal_unit(
             &round_to,
             js_str!("largestUnit"),
             TemporalUnitGroup::DateTime,
@@ -658,15 +659,15 @@ impl Duration {
             super::to_relative_temporal_object(&round_to, context)?;
 
         // 13. Let roundingIncrement be ? ToTemporalRoundingIncrement(roundTo).
-        let rounding_increment =
+        options.increment =
             get_option::<RoundingIncrement>(&round_to, js_str!("roundingIncrement"), context)?;
 
         // 14. Let roundingMode be ? ToTemporalRoundingMode(roundTo, "halfExpand").
-        let rounding_mode =
+        options.rounding_mode =
             get_option::<TemporalRoundingMode>(&round_to, js_str!("roundingMode"), context)?;
 
         // 15. Let smallestUnit be ? GetTemporalUnit(roundTo, "smallestUnit", datetime, undefined).
-        let smallest_unit = get_temporal_unit(
+        options.smallest_unit = get_temporal_unit(
             &round_to,
             js_str!("smallestUnit"),
             TemporalUnitGroup::DateTime,
@@ -676,17 +677,9 @@ impl Duration {
 
         // NOTE: execute step 21 earlier before initial values are shadowed.
         // 21. If smallestUnitPresent is false and largestUnitPresent is false, then
-        if smallest_unit.is_none() && largest_unit.is_none() {
-            // a. Throw a RangeError exception.
-            return Err(JsNativeError::range()
-                .with_message("smallestUnit or largestUnit must be present.")
-                .into());
-        }
+
         let rounded_duration = duration.inner.round(
-            rounding_increment,
-            smallest_unit,
-            largest_unit,
-            rounding_mode,
+            options,
             &RelativeTo {
                 date: plain_relative_to.as_ref(),
                 zdt: zoned_relative_to.as_ref(),

core/engine/src/builtins/temporal/instant/mod.rs

@@ -21,10 +21,9 @@ use crate::{
 use boa_gc::{Finalize, Trace};
 use boa_macros::js_str;
 use boa_profiler::Profiler;
-use temporal_rs::{
-    components::Instant as InnerInstant,
-    options::{RoundingIncrement, TemporalRoundingMode, TemporalUnit},
-};
+use temporal_rs::{components::Instant as InnerInstant, options::TemporalRoundingMode};
+
+use super::options::get_difference_settings;
 
 /// The `Temporal.Instant` object.
 #[derive(Debug, Clone, Trace, Finalize, JsData)]
@@ -285,15 +284,9 @@ impl Instant {
         let other = to_temporal_instant(args.get_or_undefined(0))?;
 
         // Fetch the necessary options.
-        let options = get_options_object(args.get_or_undefined(1))?;
-        let mode = get_option::<TemporalRoundingMode>(&options, js_str!("roundingMode"), context)?;
-        let increment =
-            get_option::<RoundingIncrement>(&options, js_str!("roundingIncrement"), context)?;
-        let smallest_unit = get_option::<TemporalUnit>(&options, js_str!("smallestUnit"), context)?;
-        let largest_unit = get_option::<TemporalUnit>(&options, js_str!("largestUnit"), context)?;
-        let result = instant
-            .inner
-            .until(&other, mode, increment, smallest_unit, largest_unit)?;
+        let settings =
+            get_difference_settings(&get_options_object(args.get_or_undefined(1))?, context)?;
+        let result = instant.inner.until(&other, settings)?;
         create_temporal_duration(result.into(), None, context).map(Into::into)
     }
 
@@ -314,15 +307,9 @@ impl Instant {
 
         // 3. Return ? DifferenceTemporalInstant(since, instant, other, options).
         let other = to_temporal_instant(args.get_or_undefined(0))?;
-        let options = get_options_object(args.get_or_undefined(1))?;
-        let mode = get_option::<TemporalRoundingMode>(&options, js_str!("roundingMode"), context)?;
-        let increment =
-            get_option::<RoundingIncrement>(&options, js_str!("roundingIncrement"), context)?;
-        let smallest_unit = get_option::<TemporalUnit>(&options, js_str!("smallestUnit"), context)?;
-        let largest_unit = get_option::<TemporalUnit>(&options, js_str!("largestUnit"), context)?;
-        let result = instant
-            .inner
-            .since(&other, mode, increment, smallest_unit, largest_unit)?;
+        let settings =
+            get_difference_settings(&get_options_object(args.get_or_undefined(1))?, context)?;
+        let result = instant.inner.since(&other, settings)?;
         create_temporal_duration(result.into(), None, context).map(Into::into)
     }
 

core/engine/src/builtins/temporal/options.rs

@@ -13,9 +13,10 @@ use crate::{
     string::JsStr,
     Context, JsNativeError, JsObject, JsResult, JsValue,
 };
+use boa_macros::js_str;
 use temporal_rs::options::{
-    ArithmeticOverflow, DurationOverflow, InstantDisambiguation, OffsetDisambiguation,
-    RoundingIncrement, TemporalRoundingMode, TemporalUnit,
+    ArithmeticOverflow, DifferenceSettings, DurationOverflow, InstantDisambiguation,
+    OffsetDisambiguation, RoundingIncrement, TemporalRoundingMode, TemporalUnit,
 };
 
 // TODO: Expand docs on the below options.
@@ -46,6 +47,21 @@ pub(crate) fn get_temporal_unit(
     Ok(unit)
 }
 
+#[inline]
+pub(crate) fn get_difference_settings(
+    options: &JsObject,
+    context: &mut Context,
+) -> JsResult<DifferenceSettings> {
+    let mut settings = DifferenceSettings::default();
+    settings.rounding_mode =
+        get_option::<TemporalRoundingMode>(options, js_str!("roundingMode"), context)?;
+    settings.increment =
+        get_option::<RoundingIncrement>(options, js_str!("roundingIncrement"), context)?;
+    settings.smallest_unit = get_option::<TemporalUnit>(options, js_str!("smallestUnit"), context)?;
+    settings.largest_unit = get_option::<TemporalUnit>(options, js_str!("largestUnit"), context)?;
+    Ok(settings)
+}
+
 #[derive(Debug, Clone, Copy)]
 #[allow(unused)]
 pub(crate) enum TemporalUnitGroup {

core/engine/src/builtins/temporal/plain_date/mod.rs

@@ -28,7 +28,10 @@ use temporal_rs::{
     options::ArithmeticOverflow,
 };
 
-use super::{calendar, PlainDateTime, ZonedDateTime};
+use super::{
+    calendar, create_temporal_duration, options::get_difference_settings,
+    to_temporal_duration_record, PlainDateTime, ZonedDateTime,
+};
 
 /// The `Temporal.PlainDate` object.
 #[derive(Debug, Clone, Trace, Finalize, JsData)]
@@ -495,22 +498,84 @@ impl PlainDate {
             .into())
     }
 
-    fn get_iso_fields(this: &JsValue, _: &[JsValue], _: &mut Context) -> JsResult<JsValue> {
-        Err(JsNativeError::error()
-            .with_message("not yet implemented.")
-            .into())
+    fn get_iso_fields(this: &JsValue, _: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
+        // 1. Let temporalDate be the this value.
+        // 2. Perform ? RequireInternalSlot(temporalDate, [[InitializedTemporalDate]]).
+        let date = this
+            .as_object()
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDate object.")
+            })?;
+
+        // 3. Let fields be OrdinaryObjectCreate(%Object.prototype%).
+        let fields = JsObject::with_object_proto(context.intrinsics());
+
+        // 4. Perform ! CreateDataPropertyOrThrow(fields, "calendar", temporalDate.[[Calendar]]).
+        fields.create_data_property_or_throw(
+            js_str!("calendar"),
+            JsString::from(date.inner.calendar().identifier()?),
+            context,
+        )?;
+        // 5. Perform ! CreateDataPropertyOrThrow(fields, "isoDay", 𝔽(temporalDate.[[ISODay]])).
+        fields.create_data_property_or_throw(js_str!("isoDay"), date.inner.iso_day(), context)?;
+        // 6. Perform ! CreateDataPropertyOrThrow(fields, "isoMonth", 𝔽(temporalDate.[[ISOMonth]])).
+        fields.create_data_property_or_throw(
+            js_str!("isoMonth"),
+            date.inner.iso_month(),
+            context,
+        )?;
+        // 7. Perform ! CreateDataPropertyOrThrow(fields, "isoYear", 𝔽(temporalDate.[[ISOYear]])).
+        fields.create_data_property_or_throw(js_str!("isoYear"), date.inner.iso_year(), context)?;
+        // 8. Return fields.
+        Ok(fields.into())
     }
 
-    fn add(this: &JsValue, _: &[JsValue], _: &mut Context) -> JsResult<JsValue> {
-        Err(JsNativeError::error()
-            .with_message("not yet implemented.")
-            .into())
+    fn add(this: &JsValue, args: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
+        // 1. Let temporalDate be the this value.
+        // 2. Perform ? RequireInternalSlot(temporalDate, [[InitializedTemporalDate]]).
+        let date = this
+            .as_object()
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDate object.")
+            })?;
+
+        // 3. Let duration be ? ToTemporalDuration(temporalDurationLike).
+        let duration = to_temporal_duration_record(args.get_or_undefined(0), context)?;
+
+        // 4. Set options to ? GetOptionsObject(options).
+        let options = get_options_object(args.get_or_undefined(1))?;
+
+        let overflow = get_option::<ArithmeticOverflow>(&options, js_str!("overflow"), context)?;
+
+        // 5. Let calendarRec be ? CreateCalendarMethodsRecord(temporalDate.[[Calendar]], « date-add »).
+        // 6. Return ? AddDate(calendarRec, temporalDate, duration, options).
+        create_temporal_date(date.inner.add(&duration, overflow)?, None, context).map(Into::into)
     }
 
-    fn subtract(this: &JsValue, _: &[JsValue], _: &mut Context) -> JsResult<JsValue> {
-        Err(JsNativeError::error()
-            .with_message("not yet implemented.")
-            .into())
+    fn subtract(this: &JsValue, args: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
+        // 1. Let temporalDate be the this value.
+        // 2. Perform ? RequireInternalSlot(temporalDate, [[InitializedTemporalDate]]).
+        let date = this
+            .as_object()
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDate object.")
+            })?;
+
+        // 3. Let duration be ? ToTemporalDuration(temporalDurationLike).
+        let duration = to_temporal_duration_record(args.get_or_undefined(0), context)?;
+
+        // 4. Set options to ? GetOptionsObject(options).
+        let options = get_options_object(args.get_or_undefined(1))?;
+        let overflow = get_option::<ArithmeticOverflow>(&options, js_str!("overflow"), context)?;
+
+        // 5. Let negatedDuration be CreateNegatedTemporalDuration(duration).
+        // 6. Let calendarRec be ? CreateCalendarMethodsRecord(temporalDate.[[Calendar]], « date-add »).
+        // 7. Return ? AddDate(calendarRec, temporalDate, negatedDuration, options).
+        create_temporal_date(date.inner.subtract(&duration, overflow)?, None, context)
+            .map(Into::into)
     }
 
     fn with(this: &JsValue, _: &[JsValue], _: &mut Context) -> JsResult<JsValue> {
@@ -525,16 +590,44 @@ impl PlainDate {
             .into())
     }
 
-    fn until(this: &JsValue, _: &[JsValue], _: &mut Context) -> JsResult<JsValue> {
-        Err(JsNativeError::error()
-            .with_message("not yet implemented.")
-            .into())
+    fn until(this: &JsValue, args: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
+        // 1. Let temporalDate be the this value.
+        // 2. Perform ? RequireInternalSlot(temporalDate, [[InitializedTemporalDate]]).
+        let date = this
+            .as_object()
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDate object.")
+            })?;
+
+        let other = to_temporal_date(args.get_or_undefined(0), None, context)?;
+
+        // 3. Return ? DifferenceTemporalPlainDate(until, temporalDate, other, options).
+        let options = get_options_object(args.get_or_undefined(1))?;
+        let settings = get_difference_settings(&options, context)?;
+
+        create_temporal_duration(date.inner.until(&other.inner, settings)?, None, context)
+            .map(Into::into)
     }
 
-    fn since(this: &JsValue, _: &[JsValue], _: &mut Context) -> JsResult<JsValue> {
-        Err(JsNativeError::error()
-            .with_message("not yet implemented.")
-            .into())
+    fn since(this: &JsValue, args: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
+        // 1. Let temporalDate be the this value.
+        // 2. Perform ? RequireInternalSlot(temporalDate, [[InitializedTemporalDate]]).
+        let date = this
+            .as_object()
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDate object.")
+            })?;
+
+        // 3. Return ? DifferenceTemporalPlainDate(since, temporalDate, other, options).
+        let other = to_temporal_date(args.get_or_undefined(0), None, context)?;
+
+        let options = get_options_object(args.get_or_undefined(1))?;
+        let settings = get_difference_settings(&options, context)?;
+
+        create_temporal_duration(date.inner.since(&other.inner, settings)?, None, context)
+            .map(Into::into)
     }
 
     fn equals(this: &JsValue, _: &[JsValue], _: &mut Context) -> JsResult<JsValue> {

core/engine/src/builtins/temporal/plain_date_time/mod.rs

@@ -3,6 +3,7 @@
 
 use crate::{
     builtins::{
+        options::{get_option, get_options_object},
         temporal::{calendar, to_integer_with_truncation},
         BuiltInBuilder, BuiltInConstructor, BuiltInObject, IntrinsicObject,
     },
@@ -27,8 +28,11 @@ use temporal_rs::{
         DateTime as InnerDateTime,
     },
     iso::{IsoDate, IsoDateSlots},
+    options::ArithmeticOverflow,
 };
 
+use super::to_temporal_duration_record;
+
 /// The `Temporal.PlainDateTime` object.
 #[derive(Debug, Clone, Trace, Finalize, JsData)]
 #[boa_gc(unsafe_empty_trace)] // TODO: Remove this!!! `InnerDateTime` could contain `Trace` types.
@@ -267,6 +271,8 @@ impl IntrinsicObject for PlainDateTime {
                 None,
                 Attribute::CONFIGURABLE,
             )
+            .method(Self::add, js_string!("add"), 2)
+            .method(Self::subtract, js_string!("subtract"), 2)
             .build();
     }
 
@@ -290,7 +296,7 @@ impl BuiltInConstructor for PlainDateTime {
         if new_target.is_undefined() {
             // a. Throw a TypeError exception.
             return Err(JsNativeError::typ()
-                .with_message("NewTarget cannot be undefined when contructing PlainDateTime.")
+                .with_message("NewTarget cannot be undefined when contructing PlainDatedt.")
                 .into());
         };
 
@@ -348,309 +354,320 @@ impl BuiltInConstructor for PlainDateTime {
 // ==== `PlainDateTimeTime` accessor implmentations ====
 
 impl PlainDateTime {
-    /// 5.3.3 get `Temporal.PlainDateTime.prototype.calendarId`
+    /// 5.3.3 get `Temporal.PlainDatedt.prototype.calendarId`
     fn get_calendar_id(this: &JsValue, _: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
-        let date = this
+        let dt = this
             .as_object()
             .and_then(JsObject::downcast_ref::<Self>)
             .ok_or_else(|| {
                 JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
             })?;
 
-        Ok(JsString::from(date.inner.calendar().identifier()?).into())
+        Ok(JsString::from(dt.inner.calendar().identifier()?).into())
     }
 
-    /// 5.3.4 get `Temporal.PlainDateTime.prototype.year`
+    /// 5.3.4 get `Temporal.PlainDatedt.prototype.year`
     fn get_year(this: &JsValue, _: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
-        let obj = this
+        let dt = this
             .as_object()
-            .ok_or_else(|| JsNativeError::typ().with_message("this must be an object."))?;
-
-        let Some(date) = obj.downcast_ref::<Self>() else {
-            return Err(JsNativeError::typ()
-                .with_message("the this object must be a PlainDateTime object.")
-                .into());
-        };
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
+            })?;
 
-        Ok(date.inner.year()?.into())
+        Ok(dt.inner.year()?.into())
     }
 
-    /// 5.3.5 get `Temporal.PlainDateTime.prototype.month`
+    /// 5.3.5 get `Temporal.PlainDatedt.prototype.month`
     fn get_month(this: &JsValue, _: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
-        let obj = this
+        let dt = this
             .as_object()
-            .ok_or_else(|| JsNativeError::typ().with_message("this must be an object."))?;
-
-        let Some(date) = obj.downcast_ref::<Self>() else {
-            return Err(JsNativeError::typ()
-                .with_message("the this object must be a PlainDateTime object.")
-                .into());
-        };
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
+            })?;
 
-        Ok(date.inner.month()?.into())
+        Ok(dt.inner.month()?.into())
     }
 
-    /// 5.3.6 get Temporal.PlainDateTime.prototype.monthCode
+    /// 5.3.6 get Temporal.PlainDatedt.prototype.monthCode
     fn get_month_code(this: &JsValue, _: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
-        let obj = this
+        let dt = this
             .as_object()
-            .ok_or_else(|| JsNativeError::typ().with_message("this must be an object."))?;
-
-        let Some(date) = obj.downcast_ref::<Self>() else {
-            return Err(JsNativeError::typ()
-                .with_message("the this object must be a PlainDateTime object.")
-                .into());
-        };
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
+            })?;
 
-        Ok(JsString::from(date.inner.month_code()?.as_str()).into())
+        Ok(JsString::from(dt.inner.month_code()?.as_str()).into())
     }
 
-    /// 5.3.7 get `Temporal.PlainDateTime.prototype.day`
+    /// 5.3.7 get `Temporal.PlainDatedt.prototype.day`
     fn get_day(this: &JsValue, _: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
-        let obj = this
+        let dt = this
             .as_object()
-            .ok_or_else(|| JsNativeError::typ().with_message("this must be an object."))?;
-
-        let Some(date) = obj.downcast_ref::<Self>() else {
-            return Err(JsNativeError::typ()
-                .with_message("the this object must be a PlainDateTime object.")
-                .into());
-        };
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
+            })?;
 
-        Ok(date.inner.day()?.into())
+        Ok(dt.inner.day()?.into())
     }
 
-    /// 5.3.8 get `Temporal.PlainDateTime.prototype.hour`
+    /// 5.3.8 get `Temporal.PlainDatedt.prototype.hour`
     fn get_hour(this: &JsValue, _: &[JsValue], _: &mut Context) -> JsResult<JsValue> {
         // 1. Let dateTime be the this value.
         // 2. Perform ? RequireInternalSlot(dateTime, [[InitializedTemporalDateTime]]).
-        let time = this
+        let dt = this
             .as_object()
             .and_then(JsObject::downcast_ref::<Self>)
             .ok_or_else(|| {
                 JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
             })?;
 
-        // 3. Return 𝔽(dateTime.[[ISOHour]]).
-        Ok(time.inner.hour().into())
+        // 3. Return 𝔽(datedt.[[ISOHour]]).
+        Ok(dt.inner.hour().into())
     }
 
-    /// 5.3.9 get `Temporal.PlainDateTime.prototype.minute`
+    /// 5.3.9 get `Temporal.PlainDatedt.prototype.minute`
     fn get_minute(this: &JsValue, _: &[JsValue], _: &mut Context) -> JsResult<JsValue> {
         // 1. Let dateTime be the this value.
         // 2. Perform ? RequireInternalSlot(dateTime, [[InitializedTemporalDateTime]]).
-        let time = this
+        let dt = this
             .as_object()
             .and_then(JsObject::downcast_ref::<Self>)
             .ok_or_else(|| {
                 JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
             })?;
 
-        // 3. Return 𝔽(dateTime.[[ISOMinute]]).
-        Ok(time.inner.minute().into())
+        // 3. Return 𝔽(datedt.[[ISOMinute]]).
+        Ok(dt.inner.minute().into())
     }
 
-    /// 5.3.10 get `Temporal.PlainDateTime.prototype.second`
+    /// 5.3.10 get `Temporal.PlainDatedt.prototype.second`
     fn get_second(this: &JsValue, _: &[JsValue], _: &mut Context) -> JsResult<JsValue> {
         // 1. Let dateTime be the this value.
         // 2. Perform ? RequireInternalSlot(dateTime, [[InitializedTemporalDateTime]]).
-        let time = this
+        let dt = this
             .as_object()
             .and_then(JsObject::downcast_ref::<Self>)
             .ok_or_else(|| {
                 JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
             })?;
 
-        // 3. Return 𝔽(dateTime.[[ISOSecond]]).
-        Ok(time.inner.second().into())
+        // 3. Return 𝔽(datedt.[[ISOSecond]]).
+        Ok(dt.inner.second().into())
     }
 
-    /// 5.3.11 get `Temporal.PlainDateTime.prototype.millisecond`
+    /// 5.3.11 get `Temporal.PlainDatedt.prototype.millisecond`
     fn get_millisecond(this: &JsValue, _: &[JsValue], _: &mut Context) -> JsResult<JsValue> {
         // 1. Let dateTime be the this value.
         // 2. Perform ? RequireInternalSlot(dateTime, [[InitializedTemporalDateTime]]).
-        let time = this
+        let dt = this
             .as_object()
             .and_then(JsObject::downcast_ref::<Self>)
             .ok_or_else(|| {
                 JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
             })?;
 
-        // 3. Return 𝔽(dateTime.[[ISOMillisecond]]).
-        Ok(time.inner.millisecond().into())
+        // 3. Return 𝔽(datedt.[[ISOMillisecond]]).
+        Ok(dt.inner.millisecond().into())
     }
 
-    /// 5.3.12 get `Temporal.PlainDateTime.prototype.microsecond`
+    /// 5.3.12 get `Temporal.PlainDatedt.prototype.microsecond`
     fn get_microsecond(this: &JsValue, _: &[JsValue], _: &mut Context) -> JsResult<JsValue> {
         // 1. Let dateTime be the this value.
         // 2. Perform ? RequireInternalSlot(dateTime, [[InitializedTemporalDateTime]]).
-        let time = this
+        let dt = this
             .as_object()
             .and_then(JsObject::downcast_ref::<Self>)
             .ok_or_else(|| {
                 JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
             })?;
 
-        // 3. Return 𝔽(dateTime.[[ISOMicrosecond]]).
-        Ok(time.inner.microsecond().into())
+        // 3. Return 𝔽(datedt.[[ISOMicrosecond]]).
+        Ok(dt.inner.microsecond().into())
     }
 
-    /// 5.3.13 get `Temporal.PlainDateTime.prototype.nanosecond`
+    /// 5.3.13 get `Temporal.PlainDatedt.prototype.nanosecond`
     fn get_nanosecond(this: &JsValue, _: &[JsValue], _: &mut Context) -> JsResult<JsValue> {
         // 1. Let dateTime be the this value.
         // 2. Perform ? RequireInternalSlot(dateTime, [[InitializedTemporalDateTime]]).
-        let time = this
+        let dt = this
             .as_object()
             .and_then(JsObject::downcast_ref::<Self>)
             .ok_or_else(|| {
                 JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
             })?;
 
-        // 3. Return 𝔽(dateTime.[[ISONanosecond]]).
-        Ok(time.inner.nanosecond().into())
+        // 3. Return 𝔽(datedt.[[ISONanosecond]]).
+        Ok(dt.inner.nanosecond().into())
     }
 
-    /// 5.3.14 get `Temporal.PlainDateTime.prototype.dayOfWeek`
+    /// 5.3.14 get `Temporal.PlainDatedt.prototype.dayOfWeek`
     fn get_day_of_week(this: &JsValue, _: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
-        let obj = this
+        let dt = this
             .as_object()
-            .ok_or_else(|| JsNativeError::typ().with_message("this must be an object."))?;
-
-        let Some(date) = obj.downcast_ref::<Self>() else {
-            return Err(JsNativeError::typ()
-                .with_message("the this object must be a PlainDateTime object.")
-                .into());
-        };
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
+            })?;
 
-        Ok(date.inner.day_of_week()?.into())
+        Ok(dt.inner.day_of_week()?.into())
     }
 
-    /// 5.3.15 get `Temporal.PlainDateTime.prototype.dayOfYear`
+    /// 5.3.15 get `Temporal.PlainDatedt.prototype.dayOfYear`
     fn get_day_of_year(this: &JsValue, _: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
-        let obj = this
+        let dt = this
             .as_object()
-            .ok_or_else(|| JsNativeError::typ().with_message("this must be an object."))?;
-
-        let Some(date) = obj.downcast_ref::<Self>() else {
-            return Err(JsNativeError::typ()
-                .with_message("the this object must be a PlainDateTime object.")
-                .into());
-        };
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
+            })?;
 
-        Ok(date.inner.day_of_year()?.into())
+        Ok(dt.inner.day_of_year()?.into())
     }
 
-    /// 5.3.16 get `Temporal.PlainDateTime.prototype.weekOfYear`
+    /// 5.3.16 get `Temporal.PlainDatedt.prototype.weekOfYear`
     fn get_week_of_year(this: &JsValue, _: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
-        let obj = this
+        let dt = this
             .as_object()
-            .ok_or_else(|| JsNativeError::typ().with_message("this must be an object."))?;
-
-        let Some(date) = obj.downcast_ref::<Self>() else {
-            return Err(JsNativeError::typ()
-                .with_message("the this object must be a PlainDateTime object.")
-                .into());
-        };
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
+            })?;
 
-        Ok(date.inner.week_of_year()?.into())
+        Ok(dt.inner.week_of_year()?.into())
     }
 
-    /// 5.3.17 get `Temporal.PlainDateTime.prototype.yearOfWeek`
+    /// 5.3.17 get `Temporal.PlainDatedt.prototype.yearOfWeek`
     fn get_year_of_week(this: &JsValue, _: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
-        let obj = this
+        let dt = this
             .as_object()
-            .ok_or_else(|| JsNativeError::typ().with_message("this must be an object."))?;
-
-        let Some(date) = obj.downcast_ref::<Self>() else {
-            return Err(JsNativeError::typ()
-                .with_message("the this object must be a PlainDateTime object.")
-                .into());
-        };
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
+            })?;
 
-        Ok(date.inner.year_of_week()?.into())
+        Ok(dt.inner.year_of_week()?.into())
     }
 
-    /// 5.3.18 get `Temporal.PlainDateTime.prototype.daysInWeek`
+    /// 5.3.18 get `Temporal.PlainDatedt.prototype.daysInWeek`
     fn get_days_in_week(this: &JsValue, _: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
-        let obj = this
+        let dt = this
             .as_object()
-            .ok_or_else(|| JsNativeError::typ().with_message("this must be an object."))?;
-
-        let Some(date) = obj.downcast_ref::<Self>() else {
-            return Err(JsNativeError::typ()
-                .with_message("the this object must be a PlainDateTime object.")
-                .into());
-        };
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
+            })?;
 
-        Ok(date.inner.days_in_week()?.into())
+        Ok(dt.inner.days_in_week()?.into())
     }
 
-    /// 5.3.19 get `Temporal.PlainDateTime.prototype.daysInMonth`
+    /// 5.3.19 get `Temporal.PlainDatedt.prototype.daysInMonth`
     fn get_days_in_month(
         this: &JsValue,
         _: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        let obj = this
+        let dt = this
             .as_object()
-            .ok_or_else(|| JsNativeError::typ().with_message("this must be an object."))?;
-
-        let Some(date) = obj.downcast_ref::<Self>() else {
-            return Err(JsNativeError::typ()
-                .with_message("the this object must be a PlainDateTime object.")
-                .into());
-        };
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
+            })?;
 
-        Ok(date.inner.days_in_month()?.into())
+        Ok(dt.inner.days_in_month()?.into())
     }
 
-    /// 5.3.20 get `Temporal.PlainDateTime.prototype.daysInYear`
+    /// 5.3.20 get `Temporal.PlainDatedt.prototype.daysInYear`
     fn get_days_in_year(this: &JsValue, _: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
-        let obj = this
+        let dt = this
             .as_object()
-            .ok_or_else(|| JsNativeError::typ().with_message("this must be an object."))?;
-
-        let Some(date) = obj.downcast_ref::<Self>() else {
-            return Err(JsNativeError::typ()
-                .with_message("the this object must be a PlainDateTime object.")
-                .into());
-        };
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
+            })?;
 
-        Ok(date.inner.days_in_year()?.into())
+        Ok(dt.inner.days_in_year()?.into())
     }
 
-    /// 5.3.21 get `Temporal.PlainDateTime.prototype.monthsInYear`
+    /// 5.3.21 get `Temporal.PlainDatedt.prototype.monthsInYear`
     fn get_months_in_year(
         this: &JsValue,
         _: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        let obj = this
+        let dt = this
             .as_object()
-            .ok_or_else(|| JsNativeError::typ().with_message("this must be an object."))?;
-
-        let Some(date) = obj.downcast_ref::<Self>() else {
-            return Err(JsNativeError::typ()
-                .with_message("the this object must be a PlainDateTime object.")
-                .into());
-        };
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
+            })?;
 
-        Ok(date.inner.months_in_year()?.into())
+        Ok(dt.inner.months_in_year()?.into())
     }
 
-    /// 5.3.22 get `Temporal.PlainDateTime.prototype.inLeapYear`
+    /// 5.3.22 get `Temporal.PlainDatedt.prototype.inLeapYear`
     fn get_in_leap_year(this: &JsValue, _: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
-        let obj = this
+        let dt = this
             .as_object()
-            .ok_or_else(|| JsNativeError::typ().with_message("this must be an object."))?;
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
+            })?;
 
-        let Some(date) = obj.downcast_ref::<Self>() else {
-            return Err(JsNativeError::typ()
-                .with_message("the this object must be a PlainDateTime object.")
-                .into());
-        };
+        Ok(dt.inner.in_leap_year()?.into())
+    }
+}
+
+// ==== PlainDateTime method implementations ====
+
+impl PlainDateTime {
+    fn add(this: &JsValue, args: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
+        // 1. Let temporalDate be the this value.
+        // 2. Perform ? RequireInternalSlot(temporalDate, [[InitializedTemporalDate]]).
+        let dt = this
+            .as_object()
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
+            })?;
+
+        // 3. Let duration be ? ToTemporalDuration(temporalDurationLike).
+        let duration = to_temporal_duration_record(args.get_or_undefined(0), context)?;
+
+        // 4. Set options to ? GetOptionsObject(options).
+        let options = get_options_object(args.get_or_undefined(1))?;
+        let overflow = get_option::<ArithmeticOverflow>(&options, js_str!("overflow"), context)?;
+
+        // 5. Let calendarRec be ? CreateCalendarMethodsRecord(temporalDate.[[Calendar]], « date-add »).
+        // 6. Return ? AddDate(calendarRec, temporalDate, duration, options).
+        create_temporal_datetime(dt.inner.add(&duration, overflow)?, None, context).map(Into::into)
+    }
+
+    fn subtract(this: &JsValue, args: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
+        // 1. Let temporalDate be the this value.
+        // 2. Perform ? RequireInternalSlot(temporalDate, [[InitializedTemporalDate]]).
+        let dt = this
+            .as_object()
+            .and_then(JsObject::downcast_ref::<Self>)
+            .ok_or_else(|| {
+                JsNativeError::typ().with_message("the this object must be a PlainDateTime object.")
+            })?;
+
+        // 3. Let duration be ? ToTemporalDuration(temporalDurationLike).
+        let duration = to_temporal_duration_record(args.get_or_undefined(0), context)?;
+
+        // 4. Set options to ? GetOptionsObject(options).
+        let options = get_options_object(args.get_or_undefined(1))?;
+        let overflow = get_option::<ArithmeticOverflow>(&options, js_str!("overflow"), context)?;
 
-        Ok(date.inner.in_leap_year()?.into())
+        // 5. Let negatedDuration be CreateNegatedTemporalDuration(duration).
+        // 6. Let calendarRec be ? CreateCalendarMethodsRecord(temporalDate.[[Calendar]], « date-add »).
+        // 7. Return ? AddDate(calendarRec, temporalDate, negatedDuration, options).
+        create_temporal_datetime(dt.inner.subtract(&duration, overflow)?, None, context)
+            .map(Into::into)
     }
 }
 
@@ -680,7 +697,7 @@ pub(crate) fn create_temporal_datetime(
             .into()
     };
 
-    // 5. Let object be ? OrdinaryCreateFromConstructor(newTarget, "%Temporal.PlainDateTime.prototype%", « [[InitializedTemporalDateTime]], [[ISOYear]], [[ISOMonth]], [[ISODay]], [[ISOHour]], [[ISOMinute]], [[ISOSecond]], [[ISOMillisecond]], [[ISOMicrosecond]], [[ISONanosecond]], [[Calendar]] »).
+    // 5. Let object be ? OrdinaryCreateFromConstructor(newTarget, "%Temporal.PlainDatedt.prototype%", « [[InitializedTemporalDateTime]], [[ISOYear]], [[ISOMonth]], [[ISODay]], [[ISOHour]], [[ISOMinute]], [[ISOSecond]], [[ISOMillisecond]], [[ISOMicrosecond]], [[ISONanosecond]], [[Calendar]] »).
     let prototype = get_prototype_from_constructor(
         &new_target,
         StandardConstructors::plain_date_time,