system/serenity
system/serenity
1
0
Fork 0
mirror of https://github.com/SerenityOS/serenity synced 2024-07-21 10:05:32 +00:00
Code Issues Actions 5 Packages Projects Releases Wiki Activity

LibJS: Convert Date-related equations into proper AOs

Browse source 
This is an editorial change in the ECMA-262 spec. See:
https://github.com/tc39/ecma262/commit/7178fa8
This commit is contained in:
Timothy Flynn 2023-10-03 11:01:19 -04:00 committed by Andreas Kling
parent 021a141b53
commit ddaba88340
2 changed files with 222 additions and 167 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

377
Userland/Libraries/LibJS/Runtime/Date.cpp
View file

@ -1,6 +1,6 @@
/*
* Copyright (c) 2020-2023, Linus Groh <linusg@serenityos.org>
* Copyright (c) 2022, Tim Flynn <trflynn89@serenityos.org>
* Copyright (c) 2022-2023, Tim Flynn <trflynn89@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -62,97 +62,78 @@ ErrorOr<String> Date::iso_date_string() const
return builder.to_string();
}
// DayWithinYear(t), https://tc39.es/ecma262/#eqn-DayWithinYear
u16 day_within_year(double t)
// 21.4.1.3 Day ( t ), https://tc39.es/ecma262/#sec-day
double day(double time_value)
{
if (!Value(t).is_finite_number())
return 0;
// Day(t) - DayFromYear(YearFromTime(t))
return static_cast<u16>(day(t) - day_from_year(year_from_time(t)));
// 1. Return 𝔽(floor(ℝ(t / msPerDay))).
return floor(time_value / ms_per_day);
}
// DateFromTime(t), https://tc39.es/ecma262/#sec-date-number
u8 date_from_time(double t)
// 21.4.1.4 TimeWithinDay ( t ), https://tc39.es/ecma262/#sec-timewithinday
double time_within_day(double time)
{
switch (month_from_time(t)) {
// DayWithinYear(t) + 1𝔽 if MonthFromTime(t) = +0𝔽
case 0:
return day_within_year(t) + 1;
// DayWithinYear(t) - 30𝔽 if MonthFromTime(t) = 1𝔽
case 1:
return day_within_year(t) - 30;
// DayWithinYear(t) - 58𝔽 - InLeapYear(t) if MonthFromTime(t) = 2𝔽
case 2:
return day_within_year(t) - 58 - in_leap_year(t);
// DayWithinYear(t) - 89𝔽 - InLeapYear(t) if MonthFromTime(t) = 3𝔽
case 3:
return day_within_year(t) - 89 - in_leap_year(t);
// DayWithinYear(t) - 119𝔽 - InLeapYear(t) if MonthFromTime(t) = 4𝔽
case 4:
return day_within_year(t) - 119 - in_leap_year(t);
// DayWithinYear(t) - 150𝔽 - InLeapYear(t) if MonthFromTime(t) = 5𝔽
case 5:
return day_within_year(t) - 150 - in_leap_year(t);
// DayWithinYear(t) - 180𝔽 - InLeapYear(t) if MonthFromTime(t) = 6𝔽
case 6:
return day_within_year(t) - 180 - in_leap_year(t);
// DayWithinYear(t) - 211𝔽 - InLeapYear(t) if MonthFromTime(t) = 7𝔽
case 7:
return day_within_year(t) - 211 - in_leap_year(t);
// DayWithinYear(t) - 242𝔽 - InLeapYear(t) if MonthFromTime(t) = 8𝔽
case 8:
return day_within_year(t) - 242 - in_leap_year(t);
// DayWithinYear(t) - 272𝔽 - InLeapYear(t) if MonthFromTime(t) = 9𝔽
case 9:
return day_within_year(t) - 272 - in_leap_year(t);
// DayWithinYear(t) - 303𝔽 - InLeapYear(t) if MonthFromTime(t) = 10𝔽
case 10:
return day_within_year(t) - 303 - in_leap_year(t);
// DayWithinYear(t) - 333𝔽 - InLeapYear(t) if MonthFromTime(t) = 11𝔽
case 11:
return day_within_year(t) - 333 - in_leap_year(t);
default:
VERIFY_NOT_REACHED();
}
// 1. Return 𝔽(ℝ(t) modulo ℝ(msPerDay)).
return modulo(time, ms_per_day);
}
// DaysInYear(y), https://tc39.es/ecma262/#eqn-DaysInYear
// 21.4.1.5 DaysInYear ( y ), https://tc39.es/ecma262/#sec-daysinyear
u16 days_in_year(i32 y)
{
// 365𝔽 if (ℝ(y) modulo 4) ≠ 0
if (y % 4 != 0)
return 365;
// 366𝔽 if (ℝ(y) modulo 4) = 0 and (ℝ(y) modulo 100) ≠ 0
if (y % 4 == 0 && y % 100 != 0)
// 1. Let ry be ℝ(y).
auto ry = static_cast<double>(y);
// 2. If (ry modulo 400) = 0, return 366𝔽.
if (modulo(ry, 400.0) == 0)
return 366;
// 365𝔽 if (ℝ(y) modulo 100) = 0 and (ℝ(y) modulo 400) ≠ 0
if (y % 100 == 0 && y % 400 != 0)
// 3. If (ry modulo 100) = 0, return 365𝔽.
if (modulo(ry, 100.0) == 0)
return 365;
// 366𝔽 if (ℝ(y) modulo 400) = 0
if (y % 400 == 0)
// 4. If (ry modulo 4) = 0, return 366𝔽.
if (modulo(ry, 4.0) == 0)
return 366;
VERIFY_NOT_REACHED();
// 5. Return 365𝔽.
return 365;
}
// DayFromYear(y), https://tc39.es/ecma262/#eqn-DaysFromYear
// 21.4.1.6 DayFromYear ( y ), https://tc39.es/ecma262/#sec-dayfromyear
double day_from_year(i32 y)
{
// 𝔽(365 × (ℝ(y) - 1970) + floor((ℝ(y) - 1969) / 4) - floor((ℝ(y) - 1901) / 100) + floor((ℝ(y) - 1601) / 400))
return 365.0 * (y - 1970) + floor((y - 1969) / 4.0) - floor((y - 1901) / 100.0) + floor((y - 1601) / 400.0);
// 1. Let ry be ℝ(y).
auto ry = static_cast<double>(y);
// 2. NOTE: In the following steps, each _numYearsN_ is the number of years divisible by N that occur between the
// epoch and the start of year y. (The number is negative if y is before the epoch.)
// 3. Let numYears1 be (ry - 1970).
auto num_years_1 = ry - 1970;
// 4. Let numYears4 be floor((ry - 1969) / 4).
auto num_years_4 = floor((ry - 1969) / 4.0);
// 5. Let numYears100 be floor((ry - 1901) / 100).
auto num_years_100 = floor((ry - 1901) / 100.0);
// 6. Let numYears400 be floor((ry - 1601) / 400).
auto num_years_400 = floor((ry - 1601) / 400.0);
// 7. Return 𝔽(365 × numYears1 + numYears4 - numYears100 + numYears400).
return 365.0 * num_years_1 + num_years_4 - num_years_100 + num_years_400;
}
// TimeFromYear(y), https://tc39.es/ecma262/#eqn-TimeFromYear
// 21.4.1.7 TimeFromYear ( y ), https://tc39.es/ecma262/#sec-timefromyear
double time_from_year(i32 y)
{
// msPerDay × DayFromYear(y)
// 1. Return msPerDay × DayFromYear(y).
return ms_per_day * day_from_year(y);
}
// YearFromTime(t), https://tc39.es/ecma262/#eqn-YearFromTime
// 21.4.1.8 YearFromTime ( t ), https://tc39.es/ecma262/#sec-yearfromtime
i32 year_from_time(double t)
{
// the largest integral Number y (closest to +∞) such that TimeFromYear(y) ≤ t
// 1. Return the largest integral Number y (closest to +∞) such that TimeFromYear(y) ≤ t.
if (!Value(t).is_finite_number())
return NumericLimits<i32>::max();
@ -168,110 +149,197 @@ i32 year_from_time(double t)
return year;
}
// InLeapYear(t), https://tc39.es/ecma262/#eqn-InLeapYear
// 21.4.1.9 DayWithinYear ( t ), https://tc39.es/ecma262/#sec-daywithinyear
u16 day_within_year(double t)
{
if (!Value(t).is_finite_number())
return 0;
// 1. Return Day(t) - DayFromYear(YearFromTime(t)).
return static_cast<u16>(day(t) - day_from_year(year_from_time(t)));
}
// 21.4.1.10 InLeapYear ( t ), https://tc39.es/ecma262/#sec-inleapyear
bool in_leap_year(double t)
{
// +0𝔽 if DaysInYear(YearFromTime(t)) = 365𝔽
// 1𝔽 if DaysInYear(YearFromTime(t)) = 366𝔽
// 1. If DaysInYear(YearFromTime(t)) is 366𝔽, return 1𝔽; else return +0𝔽.
return days_in_year(year_from_time(t)) == 366;
}
// MonthFromTime(t), https://tc39.es/ecma262/#eqn-MonthFromTime
// 21.4.1.11 MonthFromTime ( t ), https://tc39.es/ecma262/#sec-monthfromtime
u8 month_from_time(double t)
{
auto in_leap_year = JS::in_leap_year(t);
// 1. Let inLeapYear be InLeapYear(t).
auto in_leap_year = static_cast<unsigned>(JS::in_leap_year(t));
// 2. Let dayWithinYear be DayWithinYear(t).
auto day_within_year = JS::day_within_year(t);
// +0𝔽 if +0𝔽 ≤ DayWithinYear(t) < 31𝔽
// 3. If dayWithinYear < 31𝔽, return +0𝔽.
if (day_within_year < 31)
return 0;
// 1𝔽 if 31𝔽 ≤ DayWithinYear(t) < 59𝔽 + InLeapYear(t)
if (31 <= day_within_year && day_within_year < 59 + in_leap_year)
// 4. If dayWithinYear < 59𝔽 + inLeapYear, return 1𝔽.
if (day_within_year < (59 + in_leap_year))
return 1;
// 2𝔽 if 59𝔽 + InLeapYear(t) ≤ DayWithinYear(t) < 90𝔽 + InLeapYear(t)
if (59 + in_leap_year <= day_within_year && day_within_year < 90 + in_leap_year)
// 5. If dayWithinYear < 90𝔽 + inLeapYear, return 2𝔽.
if (day_within_year < (90 + in_leap_year))
return 2;
// 3𝔽 if 90𝔽 + InLeapYear(t) ≤ DayWithinYear(t) < 120𝔽 + InLeapYear(t)
if (90 + in_leap_year <= day_within_year && day_within_year < 120 + in_leap_year)
// 6. If dayWithinYear < 120𝔽 + inLeapYear, return 3𝔽.
if (day_within_year < (120 + in_leap_year))
return 3;
// 4𝔽 if 120𝔽 + InLeapYear(t) ≤ DayWithinYear(t) < 151𝔽 + InLeapYear(t)
if (120 + in_leap_year <= day_within_year && day_within_year < 151 + in_leap_year)
// 7. If dayWithinYear < 151𝔽 + inLeapYear, return 4𝔽.
if (day_within_year < (151 + in_leap_year))
return 4;
// 5𝔽 if 151𝔽 + InLeapYear(t) ≤ DayWithinYear(t) < 181𝔽 + InLeapYear(t)
if (151 + in_leap_year <= day_within_year && day_within_year < 181 + in_leap_year)
// 8. If dayWithinYear < 181𝔽 + inLeapYear, return 5𝔽.
if (day_within_year < (181 + in_leap_year))
return 5;
// 6𝔽 if 181𝔽 + InLeapYear(t) ≤ DayWithinYear(t) < 212𝔽 + InLeapYear(t)
if (181 + in_leap_year <= day_within_year && day_within_year < 212 + in_leap_year)
// 9. If dayWithinYear < 212𝔽 + inLeapYear, return 6𝔽.
if (day_within_year < (212 + in_leap_year))
return 6;
// 7𝔽 if 212𝔽 + InLeapYear(t) ≤ DayWithinYear(t) < 243𝔽 + InLeapYear(t)
if (212 + in_leap_year <= day_within_year && day_within_year < 243 + in_leap_year)
// 10. If dayWithinYear < 243𝔽 + inLeapYear, return 7𝔽.
if (day_within_year < (243 + in_leap_year))
return 7;
// 8𝔽 if 243𝔽 + InLeapYear(t) ≤ DayWithinYear(t) < 273𝔽 + InLeapYear(t)
if (243 + in_leap_year <= day_within_year && day_within_year < 273 + in_leap_year)
// 11. If dayWithinYear < 273𝔽 + inLeapYear, return 8𝔽.
if (day_within_year < (273 + in_leap_year))
return 8;
// 9𝔽 if 273𝔽 + InLeapYear(t) ≤ DayWithinYear(t) < 304𝔽 + InLeapYear(t)
if (273 + in_leap_year <= day_within_year && day_within_year < 304 + in_leap_year)
// 12. If dayWithinYear < 304𝔽 + inLeapYear, return 9𝔽.
if (day_within_year < (304 + in_leap_year))
return 9;
// 10𝔽 if 304𝔽 + InLeapYear(t) ≤ DayWithinYear(t) < 334𝔽 + InLeapYear(t)
if (304 + in_leap_year <= day_within_year && day_within_year < 334 + in_leap_year)
// 13. If dayWithinYear < 334𝔽 + inLeapYear, return 10𝔽.
if (day_within_year < (334 + in_leap_year))
return 10;
// 11𝔽 if 334𝔽 + InLeapYear(t) ≤ DayWithinYear(t) < 365𝔽 + InLeapYear(t)
if (334 + in_leap_year <= day_within_year && day_within_year < 365 + in_leap_year)
return 11;
VERIFY_NOT_REACHED();
// 14. Assert: dayWithinYear < 365𝔽 + inLeapYear.
VERIFY(day_within_year < (365 + in_leap_year));
// 15. Return 11𝔽.
return 11;
}
// HourFromTime(t), https://tc39.es/ecma262/#eqn-HourFromTime
u8 hour_from_time(double t)
// 21.4.1.12 DateFromTime ( t ), https://tc39.es/ecma262/#sec-datefromtime
u8 date_from_time(double t)
{
if (!Value(t).is_finite_number())
return 0;
// 1. Let inLeapYear be InLeapYear(t).
auto in_leap_year = static_cast<unsigned>(JS::in_leap_year(t));
// 𝔽(floor(ℝ(t / msPerHour)) modulo HoursPerDay)
return static_cast<u8>(modulo(floor(t / ms_per_hour), hours_per_day));
// 2. Let dayWithinYear be DayWithinYear(t).
auto day_within_year = JS::day_within_year(t);
// 3. Let month be MonthFromTime(t).
auto month = month_from_time(t);
// 4. If month is +0𝔽, return dayWithinYear + 1𝔽.
if (month == 0)
return day_within_year + 1;
// 5. If month is 1𝔽, return dayWithinYear - 30𝔽.
if (month == 1)
return day_within_year - 30;
// 6. If month is 2𝔽, return dayWithinYear - 58𝔽 - inLeapYear.
if (month == 2)
return day_within_year - 58 - in_leap_year;
// 7. If month is 3𝔽, return dayWithinYear - 89𝔽 - inLeapYear.
if (month == 3)
return day_within_year - 89 - in_leap_year;
// 8. If month is 4𝔽, return dayWithinYear - 119𝔽 - inLeapYear.
if (month == 4)
return day_within_year - 119 - in_leap_year;
// 9. If month is 5𝔽, return dayWithinYear - 150𝔽 - inLeapYear.
if (month == 5)
return day_within_year - 150 - in_leap_year;
// 10. If month is 6𝔽, return dayWithinYear - 180𝔽 - inLeapYear.
if (month == 6)
return day_within_year - 180 - in_leap_year;
// 11. If month is 7𝔽, return dayWithinYear - 211𝔽 - inLeapYear.
if (month == 7)
return day_within_year - 211 - in_leap_year;
// 12. If month is 8𝔽, return dayWithinYear - 242𝔽 - inLeapYear.
if (month == 8)
return day_within_year - 242 - in_leap_year;
// 13. If month is 9𝔽, return dayWithinYear - 272𝔽 - inLeapYear.
if (month == 9)
return day_within_year - 272 - in_leap_year;
// 14. If month is 10𝔽, return dayWithinYear - 303𝔽 - inLeapYear.
if (month == 10)
return day_within_year - 303 - in_leap_year;
// 15. Assert: month is 11𝔽.
VERIFY(month == 11);
// 16. Return dayWithinYear - 333𝔽 - inLeapYear.
return day_within_year - 333 - in_leap_year;
}
// MinFromTime(t), https://tc39.es/ecma262/#eqn-MinFromTime
u8 min_from_time(double t)
{
if (!Value(t).is_finite_number())
return 0;
// 𝔽(floor(ℝ(t / msPerMinute)) modulo MinutesPerHour)
return static_cast<u8>(modulo(floor(t / ms_per_minute), minutes_per_hour));
}
// SecFromTime(t), https://tc39.es/ecma262/#eqn-SecFromTime
u8 sec_from_time(double t)
{
if (!Value(t).is_finite_number())
return 0;
// 𝔽(floor(ℝ(t / msPerSecond)) modulo SecondsPerMinute)
return static_cast<u8>(modulo(floor(t / ms_per_second), seconds_per_minute));
}
// msFromTime(t), https://tc39.es/ecma262/#eqn-msFromTime
u16 ms_from_time(double t)
{
if (!Value(t).is_finite_number())
return 0;
// 𝔽(ℝ(t) modulo ℝ(msPerSecond))
return static_cast<u16>(modulo(t, ms_per_second));
}
// 21.4.1.6 Week Day, https://tc39.es/ecma262/#sec-week-day
// 21.4.1.13 WeekDay ( t ), https://tc39.es/ecma262/#sec-weekday
u8 week_day(double t)
{
if (!Value(t).is_finite_number())
return 0;
// 𝔽(ℝ(Day(t) + 4𝔽) modulo 7)
// 1. Return 𝔽(ℝ(Day(t) + 4𝔽) modulo 7).
return static_cast<u8>(modulo(day(t) + 4, 7));
}
// 21.4.1.7 GetUTCEpochNanoseconds ( year, month, day, hour, minute, second, millisecond, microsecond, nanosecond ), https://tc39.es/ecma262/#sec-getutcepochnanoseconds
// 21.4.1.14 HourFromTime ( t ), https://tc39.es/ecma262/#sec-hourfromtime
u8 hour_from_time(double t)
{
if (!Value(t).is_finite_number())
return 0;
// 1. Return 𝔽(floor(ℝ(t / msPerHour)) modulo HoursPerDay).
return static_cast<u8>(modulo(floor(t / ms_per_hour), hours_per_day));
}
// 21.4.1.15 MinFromTime ( t ), https://tc39.es/ecma262/#sec-minfromtime
u8 min_from_time(double t)
{
if (!Value(t).is_finite_number())
return 0;
// 1. Return 𝔽(floor(ℝ(t / msPerMinute)) modulo MinutesPerHour).
return static_cast<u8>(modulo(floor(t / ms_per_minute), minutes_per_hour));
}
// 21.4.1.16 SecFromTime ( t ), https://tc39.es/ecma262/#sec-secfromtime
u8 sec_from_time(double t)
{
if (!Value(t).is_finite_number())
return 0;
// 1. Return 𝔽(floor(ℝ(t / msPerSecond)) modulo SecondsPerMinute).
return static_cast<u8>(modulo(floor(t / ms_per_second), seconds_per_minute));
}
// 21.4.1.17 msFromTime ( t ), https://tc39.es/ecma262/#sec-msfromtime
u16 ms_from_time(double t)
{
if (!Value(t).is_finite_number())
return 0;
// 1. Return 𝔽(ℝ(t) modulo ℝ(msPerSecond)).
return static_cast<u16>(modulo(t, ms_per_second));
}
// 21.4.1.18 GetUTCEpochNanoseconds ( year, month, day, hour, minute, second, millisecond, microsecond, nanosecond ), https://tc39.es/ecma262/#sec-getutcepochnanoseconds
Crypto::SignedBigInteger get_utc_epoch_nanoseconds(i32 year, u8 month, u8 day, u8 hour, u8 minute, u8 second, u16 millisecond, u16 microsecond, u16 nanosecond)
{
// 1. Let date be MakeDay(𝔽(year), 𝔽(month - 1), 𝔽(day)).
@ -310,7 +378,7 @@ static i64 clip_bigint_to_sane_time(Crypto::SignedBigInteger const& value)
return value.to_base_deprecated(10).to_int<i64>().value();
}
// 21.4.1.8 GetNamedTimeZoneEpochNanoseconds ( timeZoneIdentifier, year, month, day, hour, minute, second, millisecond, microsecond, nanosecond ), https://tc39.es/ecma262/#sec-getnamedtimezoneepochnanoseconds
// 21.4.1.20 GetNamedTimeZoneEpochNanoseconds ( timeZoneIdentifier, year, month, day, hour, minute, second, millisecond, microsecond, nanosecond ), https://tc39.es/ecma262/#sec-getnamedtimezoneepochnanoseconds
Vector<Crypto::SignedBigInteger> get_named_time_zone_epoch_nanoseconds(StringView time_zone_identifier, i32 year, u8 month, u8 day, u8 hour, u8 minute, u8 second, u16 millisecond, u16 microsecond, u16 nanosecond)
{
auto local_nanoseconds = get_utc_epoch_nanoseconds(year, month, day, hour, minute, second, millisecond, microsecond, nanosecond);
@ -325,7 +393,7 @@ Vector<Crypto::SignedBigInteger> get_named_time_zone_epoch_nanoseconds(StringVie
return { local_nanoseconds.minus(Crypto::SignedBigInteger { offset->seconds }.multiplied_by(s_one_billion_bigint)) };
}
// 21.4.1.9 GetNamedTimeZoneOffsetNanoseconds ( timeZoneIdentifier, epochNanoseconds ), https://tc39.es/ecma262/#sec-getnamedtimezoneoffsetnanoseconds
// 21.4.1.21 GetNamedTimeZoneOffsetNanoseconds ( timeZoneIdentifier, epochNanoseconds ), https://tc39.es/ecma262/#sec-getnamedtimezoneoffsetnanoseconds
i64 get_named_time_zone_offset_nanoseconds(StringView time_zone_identifier, Crypto::SignedBigInteger const& epoch_nanoseconds)
{
// Only called with validated time zone identifier as argument.
@ -343,14 +411,14 @@ i64 get_named_time_zone_offset_nanoseconds(StringView time_zone_identifier, Cryp
return offset->seconds * 1'000'000'000;
}
// 21.4.1.10 DefaultTimeZone ( ), https://tc39.es/ecma262/#sec-defaulttimezone
// 21.4.1.24 DefaultTimeZone ( ), https://tc39.es/ecma262/#sec-defaulttimezone
// 6.4.3 DefaultTimeZone ( ), https://tc39.es/ecma402/#sup-defaulttimezone
StringView default_time_zone()
{
return TimeZone::current_time_zone();
}
// 21.4.1.11 LocalTime ( t ), https://tc39.es/ecma262/#sec-localtime
// 21.4.1.25 LocalTime ( t ), https://tc39.es/ecma262/#sec-localtime
double local_time(double time)
{
// 1. Let localTimeZone be DefaultTimeZone().
@ -377,7 +445,7 @@ double local_time(double time)
return time + offset_milliseconds;
}
// 21.4.1.12 UTC ( t ), https://tc39.es/ecma262/#sec-utc-t
// 21.4.1.26 UTC ( t ), https://tc39.es/ecma262/#sec-utc-t
double utc_time(double time)
{
// 1. Let localTimeZone be DefaultTimeZone().
@ -425,7 +493,7 @@ double utc_time(double time)
return time - offset_milliseconds;
}
// 21.4.1.14 MakeTime ( hour, min, sec, ms ), https://tc39.es/ecma262/#sec-maketime
// 21.4.1.27 MakeTime ( hour, min, sec, ms ), https://tc39.es/ecma262/#sec-maketime
double make_time(double hour, double min, double sec, double ms)
{
// 1. If hour is not finite or min is not finite or sec is not finite or ms is not finite, return NaN.
@ -447,20 +515,7 @@ double make_time(double hour, double min, double sec, double ms)
return t;
}
// Day(t), https://tc39.es/ecma262/#eqn-Day
double day(double time_value)
{
return floor(time_value / ms_per_day);
}
// TimeWithinDay(t), https://tc39.es/ecma262/#eqn-TimeWithinDay
double time_within_day(double time)
{
// 𝔽(ℝ(t) modulo ℝ(msPerDay))
return modulo(time, ms_per_day);
}
// 21.4.1.15 MakeDay ( year, month, date ), https://tc39.es/ecma262/#sec-makeday
// 21.4.1.28 MakeDay ( year, month, date ), https://tc39.es/ecma262/#sec-makeday
double make_day(double year, double month, double date)
{
// 1. If year is not finite or month is not finite or date is not finite, return NaN.
@ -490,7 +545,7 @@ double make_day(double year, double month, double date)
return day(static_cast<double>(t)) + dt - 1;
}
// 21.4.1.16 MakeDate ( day, time ), https://tc39.es/ecma262/#sec-makedate
// 21.4.1.29 MakeDate ( day, time ), https://tc39.es/ecma262/#sec-makedate
double make_date(double day, double time)
{
// 1. If day is not finite or time is not finite, return NaN.
@ -508,7 +563,7 @@ double make_date(double day, double time)
return tv;
}
// 21.4.1.17 TimeClip ( time ), https://tc39.es/ecma262/#sec-timeclip
// 21.4.1.31 TimeClip ( time ), https://tc39.es/ecma262/#sec-timeclip
double time_clip(double time)
{
// 1. If time is not finite, return NaN.
@ -523,7 +578,7 @@ double time_clip(double time)
return to_integer_or_infinity(time);
}
// 21.4.1.19.1 IsTimeZoneOffsetString ( offsetString ), https://tc39.es/ecma262/#sec-istimezoneoffsetstring
// 21.4.1.33.1 IsTimeZoneOffsetString ( offsetString ), https://tc39.es/ecma262/#sec-istimezoneoffsetstring
bool is_time_zone_offset_string(StringView offset_string)
{
// 1. Let parseResult be ParseText(StringToCodePoints(offsetString), UTCOffset).
@ -534,7 +589,7 @@ bool is_time_zone_offset_string(StringView offset_string)
return parse_result.has_value();
}
// 21.4.1.19.2 ParseTimeZoneOffsetString ( offsetString ), https://tc39.es/ecma262/#sec-parsetimezoneoffsetstring
// 21.4.1.33.2 ParseTimeZoneOffsetString ( offsetString ), https://tc39.es/ecma262/#sec-parsetimezoneoffsetstring
double parse_time_zone_offset_string(StringView offset_string)
{
// 1. Let parseResult be ParseText(StringToCodePoints(offsetString), UTCOffset).

12
Userland/Libraries/LibJS/Runtime/Date.h
View file

@ -1,6 +1,6 @@
/*
* Copyright (c) 2020-2022, Linus Groh <linusg@serenityos.org>
* Copyright (c) 2022, Tim Flynn <trflynn89@serenityos.org>
* Copyright (c) 2022-2023, Tim Flynn <trflynn89@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -49,27 +49,27 @@ constexpr inline double ms_per_day = 86'400'000;
constexpr inline double ns_per_day = 86'400'000'000'000;
extern Crypto::SignedBigInteger const ns_per_day_bigint;
u16 day_within_year(double);
u8 date_from_time(double);
double day(double);
double time_within_day(double);
u16 days_in_year(i32);
double day_from_year(i32);
double time_from_year(i32);
i32 year_from_time(double);
u16 day_within_year(double);
bool in_leap_year(double);
u8 month_from_time(double);
u8 date_from_time(double);
u8 week_day(double);
u8 hour_from_time(double);
u8 min_from_time(double);
u8 sec_from_time(double);
u16 ms_from_time(double);
u8 week_day(double);
Crypto::SignedBigInteger get_utc_epoch_nanoseconds(i32 year, u8 month, u8 day, u8 hour, u8 minute, u8 second, u16 millisecond, u16 microsecond, u16 nanosecond);
Vector<Crypto::SignedBigInteger> get_named_time_zone_epoch_nanoseconds(StringView time_zone_identifier, i32 year, u8 month, u8 day, u8 hour, u8 minute, u8 second, u16 millisecond, u16 microsecond, u16 nanosecond);
i64 get_named_time_zone_offset_nanoseconds(StringView time_zone_identifier, Crypto::SignedBigInteger const& epoch_nanoseconds);
StringView default_time_zone();
double local_time(double time);
double utc_time(double time);
double day(double);
double time_within_day(double);
double make_time(double hour, double min, double sec, double ms);
double make_day(double year, double month, double date);
double make_date(double day, double time);