Temporal: Precalculate PlainDateTime from ZonedDateTime in more places

test/built-ins/Temporal/Duration/prototype/add/order-of-operations.js

@@ -320,9 +320,10 @@ const expectedOpsForZonedRelativeTo = expected.concat([
   "call options.relativeTo.timeZone.getPossibleInstantsFor",
   "get options.relativeTo.timeZone.getOffsetNanosecondsFor",
   "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
-  // AddDuration → AddZonedDateTime 1
+  // AddDuration
   "get options.relativeTo.timeZone.getOffsetNanosecondsFor",
   "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
+  // AddDuration → AddZonedDateTime 1
   "get options.relativeTo.calendar.dateAdd",
   "call options.relativeTo.calendar.dateAdd",
   "get options.relativeTo.timeZone.getPossibleInstantsFor",
@@ -337,8 +338,6 @@ const expectedOpsForZonedRelativeTo = expected.concat([
   // AddDuration → DifferenceZonedDateTime
   "get options.relativeTo.timeZone.getOffsetNanosecondsFor",
   "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
-  "get options.relativeTo.timeZone.getOffsetNanosecondsFor",
-  "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
   // AddDuration → DifferenceZonedDateTime → DifferenceISODateTime
   "get options.relativeTo.calendar.dateUntil",
   "call options.relativeTo.calendar.dateUntil",

test/built-ins/Temporal/Duration/prototype/add/relativeto-zoneddatetime-nanoseconds-to-days-range-errors.js

@@ -46,8 +46,7 @@ let zdt = new Temporal.ZonedDateTime(
       [epochInstant], // Returned for NanosecondsToDays step 14, setting _intermediateNs_
     ],
     [
-      // Behave normally in 4 calls made prior to NanosecondsToDays
+      // Behave normally in 3 calls made prior to NanosecondsToDays
-      TemporalHelpers.SUBSTITUTE_SKIP,
       TemporalHelpers.SUBSTITUTE_SKIP,
       TemporalHelpers.SUBSTITUTE_SKIP,
       TemporalHelpers.SUBSTITUTE_SKIP,
@@ -74,8 +73,7 @@ zdt = new Temporal.ZonedDateTime(
       [epochInstant], // Returned for NanosecondsToDays step 14, setting _intermediateNs_
     ],
     [
-      // Behave normally in 4 calls made prior to NanosecondsToDays
+      // Behave normally in 3 calls made prior to NanosecondsToDays
-      TemporalHelpers.SUBSTITUTE_SKIP,
       TemporalHelpers.SUBSTITUTE_SKIP,
       TemporalHelpers.SUBSTITUTE_SKIP,
       TemporalHelpers.SUBSTITUTE_SKIP,
@@ -103,8 +101,7 @@ zdt = new Temporal.ZonedDateTime(
       [new Temporal.Instant(-4n)], // Returned for NanosecondsToDays step 18.a, setting _oneDayFartherNs_
     ],
     [
-      // Behave normally in 4 calls made prior to NanosecondsToDays
+      // Behave normally in 3 calls made prior to NanosecondsToDays
-      TemporalHelpers.SUBSTITUTE_SKIP,
       TemporalHelpers.SUBSTITUTE_SKIP,
       TemporalHelpers.SUBSTITUTE_SKIP,
       TemporalHelpers.SUBSTITUTE_SKIP,

test/built-ins/Temporal/Duration/prototype/round/order-of-operations.js

@@ -408,8 +408,6 @@ const expectedOpsForYearRoundingZoned = expectedOpsForZonedRelativeTo.concat([
   "get options.relativeTo.timeZone.getOffsetNanosecondsFor",
   "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
   // MoveRelativeZonedDateTime → AddZonedDateTime
-  "get options.relativeTo.timeZone.getOffsetNanosecondsFor",
-  "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
   "get options.relativeTo.calendar.dateAdd",
   "call options.relativeTo.calendar.dateAdd",
   "get options.relativeTo.timeZone.getPossibleInstantsFor",
@@ -456,8 +454,6 @@ const expectedOpsForUnbalanceRoundBalance = expectedOpsForZonedRelativeTo.concat
   "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
   // No user code calls in UnbalanceDurationRelative
   // RoundDuration → MoveRelativeZonedDateTime → AddZonedDateTime
-  "get options.relativeTo.timeZone.getOffsetNanosecondsFor",  // 5. GetPlainDateTimeFor
-  "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
   "get options.relativeTo.calendar.dateAdd",                  // 8.
   "call options.relativeTo.calendar.dateAdd",
   "get options.relativeTo.timeZone.getPossibleInstantsFor",   // 10. GetInstantFor

test/built-ins/Temporal/Duration/prototype/round/relativeto-zoneddatetime-nanoseconds-to-days-range-errors.js

@@ -43,6 +43,7 @@ let zdt = new Temporal.ZonedDateTime(
   timeZoneSubstituteValues(
     [[epochInstant]], // Returned for NanosecondsToDays step 14, setting _intermediateNs_
     [
+      TemporalHelpers.SUBSTITUTE_SKIP, // Pre-conversion in Duration.p.round
       dayNs - 1, // Returned for NanosecondsToDays step 7, setting _startDateTime_
       -dayNs + 1, // Returned for NanosecondsToDays step 11, setting _endDateTime_
     ]
@@ -63,6 +64,7 @@ zdt = new Temporal.ZonedDateTime(
   timeZoneSubstituteValues(
     [[epochInstant]], // Returned for NanosecondsToDays step 14, setting _intermediateNs_
     [
+      TemporalHelpers.SUBSTITUTE_SKIP, // Pre-conversion in Duration.p.round
       -dayNs + 1, // Returned for NanosecondsToDays step 7, setting _startDateTime_
       dayNs - 1, // Returned for NanosecondsToDays step 11, setting _endDateTime_
     ]
@@ -86,6 +88,7 @@ zdt = new Temporal.ZonedDateTime(
       [new Temporal.Instant(-4n)], // Returned for NanosecondsToDays step 18.a, setting _oneDayFartherNs_
     ],
     [
+      TemporalHelpers.SUBSTITUTE_SKIP, // Pre-conversion in Duration.p.round
       dayNs - 1, // Returned for NanosecondsToDays step 7, setting _startDateTime_
       -dayNs + 1, // Returned for NanosecondsToDays step 11, setting _endDateTime_
     ]

test/built-ins/Temporal/Duration/prototype/subtract/order-of-operations.js

@@ -320,9 +320,10 @@ const expectedOpsForZonedRelativeTo = expected.concat([
   "call options.relativeTo.timeZone.getPossibleInstantsFor",
   "get options.relativeTo.timeZone.getOffsetNanosecondsFor",
   "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
-  // AddDuration → AddZonedDateTime 1
+  // AddDuration
   "get options.relativeTo.timeZone.getOffsetNanosecondsFor",
   "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
+  // AddDuration → AddZonedDateTime 1
   "get options.relativeTo.calendar.dateAdd",
   "call options.relativeTo.calendar.dateAdd",
   "get options.relativeTo.timeZone.getPossibleInstantsFor",
@@ -337,8 +338,6 @@ const expectedOpsForZonedRelativeTo = expected.concat([
   // AddDuration → DifferenceZonedDateTime
   "get options.relativeTo.timeZone.getOffsetNanosecondsFor",
   "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
-  "get options.relativeTo.timeZone.getOffsetNanosecondsFor",
-  "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
   // AddDuration → DifferenceZonedDateTime → DifferenceISODateTime
   "get options.relativeTo.calendar.dateUntil",
   "call options.relativeTo.calendar.dateUntil",

test/built-ins/Temporal/Duration/prototype/subtract/relativeto-zoneddatetime-nanoseconds-to-days-range-errors.js

@@ -46,8 +46,7 @@ let zdt = new Temporal.ZonedDateTime(
       [epochInstant], // Returned for NanosecondsToDays step 14, setting _intermediateNs_
     ],
     [
-      // Behave normally in 4 calls made prior to NanosecondsToDays
+      // Behave normally in 3 calls made prior to NanosecondsToDays
-      TemporalHelpers.SUBSTITUTE_SKIP,
       TemporalHelpers.SUBSTITUTE_SKIP,
       TemporalHelpers.SUBSTITUTE_SKIP,
       TemporalHelpers.SUBSTITUTE_SKIP,
@@ -73,8 +72,7 @@ zdt = new Temporal.ZonedDateTime(
       [epochInstant], // Returned for NanosecondsToDays step 14, setting _intermediateNs_
     ],
     [
-      // Behave normally in 4 calls made prior to NanosecondsToDays
+      // Behave normally in 3 calls made prior to NanosecondsToDays
-      TemporalHelpers.SUBSTITUTE_SKIP,
       TemporalHelpers.SUBSTITUTE_SKIP,
       TemporalHelpers.SUBSTITUTE_SKIP,
       TemporalHelpers.SUBSTITUTE_SKIP,
@@ -101,8 +99,7 @@ zdt = new Temporal.ZonedDateTime(
       [new Temporal.Instant(-4n)], // Returned for NanosecondsToDays step 18.a, setting _oneDayFartherNs_
     ],
     [
-      // Behave normally in 4 calls made prior to NanosecondsToDays
+      // Behave normally in 3 calls made prior to NanosecondsToDays
-      TemporalHelpers.SUBSTITUTE_SKIP,
       TemporalHelpers.SUBSTITUTE_SKIP,
       TemporalHelpers.SUBSTITUTE_SKIP,
       TemporalHelpers.SUBSTITUTE_SKIP,

test/built-ins/Temporal/Duration/prototype/total/order-of-operations.js

@@ -290,8 +290,6 @@ const expectedOpsForMinimalYearRoundingZoned = expectedOpsForZonedRelativeTo.con
 ], [
   // code path through RoundDuration that rounds to the nearest year:
   // MoveRelativeZonedDateTime → AddDaysToZonedDateTime
-  "get options.relativeTo.timeZone.getOffsetNanosecondsFor",
-  "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
   "get options.relativeTo.timeZone.getPossibleInstantsFor",
   "call options.relativeTo.timeZone.getPossibleInstantsFor",
   "get options.relativeTo.calendar.dateAdd",     // 7.c
@@ -315,8 +313,6 @@ const expectedOpsForYearRoundingZoned = expectedOpsForZonedRelativeTo.concat([
   "get options.relativeTo.timeZone.getOffsetNanosecondsFor",
   "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
   // MoveRelativeZonedDateTime → AddZonedDateTime
-  "get options.relativeTo.timeZone.getOffsetNanosecondsFor",
-  "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
   "get options.relativeTo.calendar.dateAdd",
   "call options.relativeTo.calendar.dateAdd",
   "get options.relativeTo.timeZone.getPossibleInstantsFor",
@@ -333,8 +329,6 @@ const expectedOpsForYearRoundingZoned = expectedOpsForZonedRelativeTo.concat([
   "get options.relativeTo.timeZone.getPossibleInstantsFor",
   "call options.relativeTo.timeZone.getPossibleInstantsFor",
   // RoundDuration → MoveRelativeZonedDateTime → AddZonedDateTime
-  "get options.relativeTo.timeZone.getOffsetNanosecondsFor",
-  "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
   "get options.relativeTo.calendar.dateAdd",
   "call options.relativeTo.calendar.dateAdd",
   "get options.relativeTo.timeZone.getPossibleInstantsFor",
@@ -363,15 +357,11 @@ const expectedOpsForUnbalanceRound = expectedOpsForZonedRelativeTo.concat([
   "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
   // No user code calls in UnbalanceDateDurationRelative
   // MoveRelativeZonedDateTime → AddZonedDateTime
-  "get options.relativeTo.timeZone.getOffsetNanosecondsFor",  // 5. GetPlainDateTimeFor
-  "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
   "get options.relativeTo.calendar.dateAdd",                  // 8.
   "call options.relativeTo.calendar.dateAdd",
   "get options.relativeTo.timeZone.getPossibleInstantsFor",   // 10. GetInstantFor
   "call options.relativeTo.timeZone.getPossibleInstantsFor",
   // RoundDuration → MoveRelativeZonedDateTime → AddZonedDateTime
-  "get options.relativeTo.timeZone.getOffsetNanosecondsFor",  // 5. GetPlainDateTimeFor
-  "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
   "get options.relativeTo.calendar.dateAdd",                  // 8.
   "call options.relativeTo.calendar.dateAdd",
   "get options.relativeTo.timeZone.getPossibleInstantsFor",   // 10. GetInstantFor
@@ -389,3 +379,37 @@ assert.compareArray(
   "order of operations with unit = months and ZonedDateTime relativeTo"
 );
 actual.splice(0); // clear
+
+// code path that avoids converting Zoned twice in BalanceTimeDurationRelative
+const expectedOpsForBalanceRound = expectedOpsForZonedRelativeTo.concat([
+  // ToTemporalDate
+  "get options.relativeTo.timeZone.getOffsetNanosecondsFor",
+  "call options.relativeTo.timeZone.getOffsetNanosecondsFor",
+  // No user code calls in UnbalanceDateDurationRelative
+  // No user code calls in AddZonedDateTime (years, months, weeks = 0)
+  // BalanceTimeDurationRelative
+  "get options.relativeTo.timeZone.getOffsetNanosecondsFor",
+  "call options.relativeTo.timeZone.getOffsetNanosecondsFor",  // 4.a
+  "get options.relativeTo.timeZone.getPossibleInstantsFor",
+  "call options.relativeTo.timeZone.getPossibleInstantsFor",   // 4.b
+  "get options.relativeTo.timeZone.getOffsetNanosecondsFor",
+  "call options.relativeTo.timeZone.getOffsetNanosecondsFor",  // NanosecondsToDays 9
+  "get options.relativeTo.timeZone.getPossibleInstantsFor",
+  "call options.relativeTo.timeZone.getPossibleInstantsFor",   // NanosecondsToDays 26
+  "get options.relativeTo.timeZone.getPossibleInstantsFor",
+  "call options.relativeTo.timeZone.getPossibleInstantsFor",   // NanosecondsToDays 31.a
+  // RoundDuration → MoveRelativeZonedDateTime → AddZonedDateTime
+  "get options.relativeTo.timeZone.getPossibleInstantsFor",   // 10. GetInstantFor
+  "call options.relativeTo.timeZone.getPossibleInstantsFor",
+  // RoundDuration
+  "get options.relativeTo.calendar.dateAdd",   // 10.d.i
+  "call options.relativeTo.calendar.dateAdd",  // 10.f
+  "call options.relativeTo.calendar.dateAdd",  // 10.i.iii
+]);
+new Temporal.Duration(0, 0, 0, 1, 240).total(createOptionsObserver({ unit: "weeks", relativeTo: zonedRelativeTo }));
+assert.compareArray(
+  actual,
+  expectedOpsForBalanceRound,
+  "order of operations with unit = weeks and no calendar units"
+);
+actual.splice(0);  // clear

test/built-ins/Temporal/Duration/prototype/total/relativeto-zoneddatetime-nanoseconds-to-days-range-errors.js

@@ -43,6 +43,7 @@ let zdt = new Temporal.ZonedDateTime(
   timeZoneSubstituteValues(
     [[epochInstant]], // Returned for NanosecondsToDays step 14, setting _intermediateNs_
     [
+      TemporalHelpers.SUBSTITUTE_SKIP,  // pre-conversion in Duration.p.total
       dayNs - 1, // Returned for NanosecondsToDays step 7, setting _startDateTime_
       -dayNs + 1, // Returned for NanosecondsToDays step 11, setting _endDateTime_
     ]
@@ -63,6 +64,7 @@ zdt = new Temporal.ZonedDateTime(
   timeZoneSubstituteValues(
     [[epochInstant]], // Returned for NanosecondsToDays step 14, setting _intermediateNs_
     [
+      TemporalHelpers.SUBSTITUTE_SKIP,  // pre-conversion in Duration.p.total
       -dayNs + 1, // Returned for NanosecondsToDays step 7, setting _startDateTime_
       dayNs - 1, // Returned for NanosecondsToDays step 11, setting _endDateTime_
     ]
@@ -86,6 +88,7 @@ zdt = new Temporal.ZonedDateTime(
       [new Temporal.Instant(-4n)], // Returned for NanosecondsToDays step 18.a, setting _oneDayFartherNs_
     ],
     [
+      TemporalHelpers.SUBSTITUTE_SKIP,  // pre-conversion in Duration.p.total
       dayNs - 1, // Returned for NanosecondsToDays step 7, setting _startDateTime_
       -dayNs + 1, // Returned for NanosecondsToDays step 11, setting _endDateTime_
     ]

test/built-ins/Temporal/ZonedDateTime/prototype/since/order-of-operations.js

@@ -318,9 +318,10 @@ const expectedOpsForCalendarDifference = [
   // TimeZoneEquals
   "get this.timeZone.id",
   "get other.timeZone.id",
-  // DifferenceZonedDateTime
+  // precalculate PlainDateTime
   "get this.timeZone.getOffsetNanosecondsFor",
   "call this.timeZone.getOffsetNanosecondsFor",
+  // DifferenceZonedDateTime
   "get this.timeZone.getOffsetNanosecondsFor",
   "call this.timeZone.getOffsetNanosecondsFor",
   // DifferenceISODateTime
@@ -344,12 +345,7 @@ const expectedOpsForCalendarDifference = [
 ];
 
 const expectedOpsForCalendarRounding = [
-  // ToTemporalDate
-  "get this.timeZone.getOffsetNanosecondsFor",
-  "call this.timeZone.getOffsetNanosecondsFor",
   // RoundDuration → MoveRelativeZonedDateTime → AddZonedDateTime
-  "get this.timeZone.getOffsetNanosecondsFor",
-  "call this.timeZone.getOffsetNanosecondsFor",
   "get this.calendar.dateAdd",
   "call this.calendar.dateAdd",
   "get this.timeZone.getPossibleInstantsFor",

test/built-ins/Temporal/ZonedDateTime/prototype/until/order-of-operations.js

@@ -318,9 +318,10 @@ const expectedOpsForCalendarDifference = [
   // TimeZoneEquals
   "get this.timeZone.id",
   "get other.timeZone.id",
-  // DifferenceZonedDateTime
+  // precalculate PlainDateTime
   "get this.timeZone.getOffsetNanosecondsFor",
   "call this.timeZone.getOffsetNanosecondsFor",
+  // DifferenceZonedDateTime
   "get this.timeZone.getOffsetNanosecondsFor",
   "call this.timeZone.getOffsetNanosecondsFor",
   // DifferenceISODateTime
@@ -344,12 +345,7 @@ const expectedOpsForCalendarDifference = [
 ];
 
 const expectedOpsForCalendarRounding = [
-  // ToTemporalDate
-  "get this.timeZone.getOffsetNanosecondsFor",
-  "call this.timeZone.getOffsetNanosecondsFor",
   // RoundDuration → MoveRelativeZonedDateTime → AddZonedDateTime
-  "get this.timeZone.getOffsetNanosecondsFor",
-  "call this.timeZone.getOffsetNanosecondsFor",
   "get this.calendar.dateAdd",
   "call this.calendar.dateAdd",
   "get this.timeZone.getPossibleInstantsFor",