LibJS: Assert DifferenceISODateTime is called with valid datetime values

This is an editorial change in the Temporal spec.

See: https://github.com/tc39/proposal-temporal/commit/143b2e2

Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTime.cpp

@@ -351,19 +351,25 @@ ISODateTime round_iso_date_time(GlobalObject& global_object, i32 year, u8 month,
 // 5.5.11 DifferenceISODateTime ( y1, mon1, d1, h1, min1, s1, ms1, mus1, ns1, y2, mon2, d2, h2, min2, s2, ms2, mus2, ns2, calendar, largestUnit, options ), https://tc39.es/proposal-temporal/#sec-temporal-differenceisodatetime
 ThrowCompletionOr<DurationRecord> difference_iso_date_time(GlobalObject& global_object, i32 year1, u8 month1, u8 day1, u8 hour1, u8 minute1, u8 second1, u16 millisecond1, u16 microsecond1, u16 nanosecond1, i32 year2, u8 month2, u8 day2, u8 hour2, u8 minute2, u8 second2, u16 millisecond2, u16 microsecond2, u16 nanosecond2, Object& calendar, StringView largest_unit, Object const& options)
 {
-    // 1. Let timeDifference be ! DifferenceTime(h1, min1, s1, ms1, mus1, ns1, h2, min2, s2, ms2, mus2, ns2).
+    // 1. Assert: ISODateTimeWithinLimits(y1, mon1, d1, h1, min1, s1, ms1, mus1, ns1) is true.
+    VERIFY(iso_date_time_within_limits(global_object, year1, month1, day1, hour1, minute1, second1, millisecond1, microsecond1, nanosecond1));
+
+    // 2. Assert: ISODateTimeWithinLimits(y2, mon2, d2, h2, min2, s2, ms2, mus2, ns2) is true.
+    VERIFY(iso_date_time_within_limits(global_object, year2, month2, day2, hour2, minute2, second2, millisecond2, microsecond2, nanosecond2));
+
+    // 3. Let timeDifference be ! DifferenceTime(h1, min1, s1, ms1, mus1, ns1, h2, min2, s2, ms2, mus2, ns2).
     auto time_difference = difference_time(hour1, minute1, second1, millisecond1, microsecond1, nanosecond1, hour2, minute2, second2, millisecond2, microsecond2, nanosecond2);
 
-    // 2. Let timeSign be ! DurationSign(0, 0, 0, 0, timeDifference.[[Hours]], timeDifference.[[Minutes]], timeDifference.[[Seconds]], timeDifference.[[Milliseconds]], timeDifference.[[Microseconds]], timeDifference.[[Nanoseconds]]).
+    // 4. Let timeSign be ! DurationSign(0, 0, 0, 0, timeDifference.[[Hours]], timeDifference.[[Minutes]], timeDifference.[[Seconds]], timeDifference.[[Milliseconds]], timeDifference.[[Microseconds]], timeDifference.[[Nanoseconds]]).
     auto time_sign = duration_sign(0, 0, 0, 0, time_difference.hours, time_difference.minutes, time_difference.seconds, time_difference.milliseconds, time_difference.microseconds, time_difference.nanoseconds);
 
-    // 3. Let dateSign be ! CompareISODate(y2, mon2, d2, y1, mon1, d1).
+    // 5. Let dateSign be ! CompareISODate(y2, mon2, d2, y1, mon1, d1).
     auto date_sign = compare_iso_date(year2, month2, day2, year1, month1, day1);
 
-    // 4. Let adjustedDate be BalanceISODate(y1, mon1, d1).
+    // 6. Let adjustedDate be BalanceISODate(y1, mon1, d1).
     auto adjusted_date = balance_iso_date(year1, month1, day1);
 
-    // 5. If timeSign is -dateSign, then
+    // 7. If timeSign is -dateSign, then
     if (time_sign == -date_sign) {
         // a. Set adjustedDate to BalanceISODate(adjustedDate.[[Year]], adjustedDate.[[Month]], adjustedDate.[[Day]] - timeSign).
         adjusted_date = balance_iso_date(adjusted_date.year, adjusted_date.month, adjusted_date.day - time_sign);
@@ -372,25 +378,25 @@ ThrowCompletionOr<DurationRecord> difference_iso_date_time(GlobalObject& global_
         time_difference = TRY(balance_duration(global_object, -time_sign, time_difference.hours, time_difference.minutes, time_difference.seconds, time_difference.milliseconds, time_difference.microseconds, Crypto::SignedBigInteger { (i32)time_difference.nanoseconds }, largest_unit));
     }
 
-    // 6. Let date1 be ? CreateTemporalDate(adjustedDate.[[Year]], adjustedDate.[[Month]], adjustedDate.[[Day]], calendar).
+    // 8. Let date1 be ? CreateTemporalDate(adjustedDate.[[Year]], adjustedDate.[[Month]], adjustedDate.[[Day]], calendar).
     auto* date1 = TRY(create_temporal_date(global_object, adjusted_date.year, adjusted_date.month, adjusted_date.day, calendar));
 
-    // 7. Let date2 be ? CreateTemporalDate(y2, mon2, d2, calendar).
+    // 9. Let date2 be ? CreateTemporalDate(y2, mon2, d2, calendar).
     auto* date2 = TRY(create_temporal_date(global_object, year2, month2, day2, calendar));
 
-    // 8. Let dateLargestUnit be ! LargerOfTwoTemporalUnits("day", largestUnit).
+    // 10. Let dateLargestUnit be ! LargerOfTwoTemporalUnits("day", largestUnit).
     auto date_largest_unit = larger_of_two_temporal_units("day"sv, largest_unit);
 
-    // 9. Let untilOptions be ? MergeLargestUnitOption(options, dateLargestUnit).
+    // 11. Let untilOptions be ? MergeLargestUnitOption(options, dateLargestUnit).
     auto* until_options = TRY(merge_largest_unit_option(global_object, options, date_largest_unit));
 
-    // 10. Let dateDifference be ? CalendarDateUntil(calendar, date1, date2, untilOptions).
+    // 12. Let dateDifference be ? CalendarDateUntil(calendar, date1, date2, untilOptions).
     auto* date_difference = TRY(calendar_date_until(global_object, calendar, date1, date2, *until_options));
 
-    // 11. Let balanceResult be ? BalanceDuration(dateDifference.[[Days]], timeDifference.[[Hours]], timeDifference.[[Minutes]], timeDifference.[[Seconds]], timeDifference.[[Milliseconds]], timeDifference.[[Microseconds]], timeDifference.[[Nanoseconds]], largestUnit).
+    // 13. Let balanceResult be ? BalanceDuration(dateDifference.[[Days]], timeDifference.[[Hours]], timeDifference.[[Minutes]], timeDifference.[[Seconds]], timeDifference.[[Milliseconds]], timeDifference.[[Microseconds]], timeDifference.[[Nanoseconds]], largestUnit).
     auto balance_result = TRY(balance_duration(global_object, date_difference->days(), time_difference.hours, time_difference.minutes, time_difference.seconds, time_difference.milliseconds, time_difference.microseconds, Crypto::SignedBigInteger { (i32)time_difference.nanoseconds }, largest_unit));
 
-    // 12. Return ! CreateDurationRecord(dateDifference.[[Years]], dateDifference.[[Months]], dateDifference.[[Weeks]], balanceResult.[[Days]], balanceResult.[[Hours]], balanceResult.[[Minutes]], balanceResult.[[Seconds]], balanceResult.[[Milliseconds]], balanceResult.[[Microseconds]], balanceResult.[[Nanoseconds]]).
+    // 14. Return ! CreateDurationRecord(dateDifference.[[Years]], dateDifference.[[Months]], dateDifference.[[Weeks]], balanceResult.[[Days]], balanceResult.[[Hours]], balanceResult.[[Minutes]], balanceResult.[[Seconds]], balanceResult.[[Milliseconds]], balanceResult.[[Microseconds]], balanceResult.[[Nanoseconds]]).
     return create_duration_record(date_difference->years(), date_difference->months(), date_difference->weeks(), balance_result.days, balance_result.hours, balance_result.minutes, balance_result.seconds, balance_result.milliseconds, balance_result.microseconds, balance_result.nanoseconds);
 }