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LibJS+LibTimeZone+LibUnicode: Indicate whether a time zone is in DST

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Return whether the time zone is in DST during the provided time from
TimeZone::get_time_zone_offset,
This commit is contained in:
Timothy Flynn 2022-01-19 14:18:02 -05:00 • committed by Linus Groh
parent 42c9c57141
commit 70f49d0696
7 changed files with 86 additions and 69 deletions
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32
Userland/Libraries/LibUnicode/DateTimeFormat.cpp
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@ -208,21 +208,21 @@ static Optional<String> format_time_zone_offset(StringView locale, StringView ti
if (!number_system.has_value())
return {};
auto offset_seconds = TimeZone::get_time_zone_offset(time_zone, time);
if (!offset_seconds.has_value())
auto offset = TimeZone::get_time_zone_offset(time_zone, time);
if (!offset.has_value())
return {};
if (*offset_seconds == 0)
if (offset->seconds == 0)
return formats->gmt_zero_format;
auto sign = *offset_seconds > 0 ? formats->symbol_ahead_sign : formats->symbol_behind_sign;
auto separator = *offset_seconds > 0 ? formats->symbol_ahead_separator : formats->symbol_behind_separator;
*offset_seconds = llabs(*offset_seconds);
auto sign = offset->seconds > 0 ? formats->symbol_ahead_sign : formats->symbol_behind_sign;
auto separator = offset->seconds > 0 ? formats->symbol_ahead_separator : formats->symbol_behind_separator;
offset->seconds = llabs(offset->seconds);
auto offset_hours = *offset_seconds / 3'600;
*offset_seconds %= 3'600;
auto offset_hours = offset->seconds / 3'600;
offset->seconds %= 3'600;
auto offset_minutes = *offset_seconds / 60;
*offset_seconds %= 60;
auto offset_minutes = offset->seconds / 60;
offset->seconds %= 60;
StringBuilder builder;
builder.append(sign);
@ -231,8 +231,8 @@ static Optional<String> format_time_zone_offset(StringView locale, StringView ti
// The long format always uses 2-digit hours field and minutes field, with optional 2-digit seconds field.
case CalendarPatternStyle::LongOffset:
builder.appendff("{:02}{}{:02}", offset_hours, separator, offset_minutes);
if (*offset_seconds > 0)
builder.appendff("{}{:02}", separator, *offset_seconds);
if (offset->seconds > 0)
builder.appendff("{}{:02}", separator, offset->seconds);
break;
// The short format is intended for the shortest representation and uses hour fields without leading zero, with optional 2-digit minutes and seconds fields.
@ -240,8 +240,8 @@ static Optional<String> format_time_zone_offset(StringView locale, StringView ti
builder.appendff("{}", offset_hours);
if (offset_minutes > 0) {
builder.appendff("{}{:02}", separator, offset_minutes);
if (*offset_seconds > 0)
builder.appendff("{}{:02}", separator, *offset_seconds);
if (offset->seconds > 0)
builder.appendff("{}{:02}", separator, offset->seconds);
}
break;
@ -250,8 +250,8 @@ static Optional<String> format_time_zone_offset(StringView locale, StringView ti
}
// The digits used for hours, minutes and seconds fields in this format are the locale's default decimal digits.
auto offset = replace_digits_for_number_system(*number_system, builder.build());
return formats->gmt_format.replace("{0}"sv, offset);
auto result = replace_digits_for_number_system(*number_system, builder.build());
return formats->gmt_format.replace("{0}"sv, result);
}
// https://unicode.org/reports/tr35/tr35-dates.html#Time_Zone_Format_Terminology