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LibJS: Replace Temporal's BalanceISODate with AddDaysToISODate

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This is an editorial change in the Temporal proposal. See:
https://github.com/tc39/proposal-temporal/commit/b28ef08
This commit is contained in:
Timothy Flynn
2026-01-13 12:31:52 -05:00
committed by Tim Flynn
parent 14ccc87190
commit 3eabdcf460
Notes: github-actions[bot] 2026-01-13 18:03:25 +00:00 
Author: https://github.com/trflynn89
Commit: https://github.com/LadybirdBrowser/ladybird/commit/3eabdcf4606
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/7458
8 changed files with 38 additions and 38 deletions
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14
Libraries/LibJS/Runtime/Temporal/PlainDateTime.cpp
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@@ -1,7 +1,7 @@
/*
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
* Copyright (c) 2021-2023, Linus Groh <linusg@serenityos.org>
* Copyright (c) 2024, Tim Flynn <trflynn89@ladybird.org>
* Copyright (c) 2024-2026, Tim Flynn <trflynn89@ladybird.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@@ -212,8 +212,8 @@ ISODateTime balance_iso_date_time(double year, double month, double day, double
// 1. Let balancedTime be BalanceTime(hour, minute, second, millisecond, microsecond, nanosecond).
auto balanced_time = balance_time(hour, minute, second, millisecond, microsecond, nanosecond);
// 2. Let balancedDate be BalanceISODate(year, month, day + balancedTime.[[Days]]).
auto balanced_date = balance_iso_date(year, month, day + balanced_time.days);
// 2. Let balancedDate be AddDaysToISODate(CreateISODateRecord(year, month, day), balancedTime.[[Days]]).
auto balanced_date = add_days_to_iso_date(create_iso_date_record(year, month, day), balanced_time.days);
// 3. Return CombineISODateAndTimeRecord(balancedDate, balancedTime).
return combine_iso_date_and_time_record(balanced_date, balanced_time);
@@ -292,8 +292,8 @@ ISODateTime round_iso_date_time(ISODateTime const& iso_date_time, u64 increment,
// 2. Let roundedTime be RoundTime(isoDateTime.[[Time]], increment, unit, roundingMode).
auto rounded_time = round_time(iso_date_time.time, increment, unit, rounding_mode);
// 3. Let balanceResult be BalanceISODate(isoDateTime.[[ISODate]].[[Year]], isoDateTime.[[ISODate]].[[Month]], isoDateTime.[[ISODate]].[[Day]] + roundedTime.[[Days]]).
auto balance_result = balance_iso_date(iso_date_time.iso_date.year, iso_date_time.iso_date.month, iso_date_time.iso_date.day + rounded_time.days);
// 3. Let balanceResult be AddDaysToISODate(isoDateTime.[[ISODate]], roundedTime.[[Days]]).
auto balance_result = add_days_to_iso_date(iso_date_time.iso_date, rounded_time.days);
// 4. Return CombineISODateAndTimeRecord(balanceResult, roundedTime).
return combine_iso_date_and_time_record(balance_result, rounded_time);
@@ -322,8 +322,8 @@ InternalDuration difference_iso_date_time(VM& vm, ISODateTime const& iso_date_ti
// 7. If timeSign = 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, static_cast<double>(adjusted_date.day) + time_sign);
// a. Set adjustedDate to AddDaysToISODate(adjustedDate, timeSign).
adjusted_date = add_days_to_iso_date(adjusted_date, time_sign);
// b. Set timeDuration to ! Add24HourDaysToTimeDuration(timeDuration, -timeSign).
time_duration = MUST(add_24_hour_days_to_time_duration(vm, time_duration, -time_sign));