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LibJS: Implement Date.UTC()

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This commit is contained in:
Nico Weber 2020-08-20 16:02:07 -04:00 • committed by Andreas Kling
parent 221b412210
commit 1eac1b360b
3 changed files with 31 additions and 0 deletions
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20
Libraries/LibJS/Runtime/DateConstructor.cpp
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@ -46,6 +46,7 @@ void DateConstructor::initialize(GlobalObject& global_object)
define_property("length", Value(7), Attribute::Configurable);
define_native_function("now", now, 0, Attribute::Writable | Attribute::Configurable);
define_native_function("UTC", utc, 1, Attribute::Writable | Attribute::Configurable);
}
DateConstructor::~DateConstructor()
@ -112,4 +113,23 @@ JS_DEFINE_NATIVE_FUNCTION(DateConstructor::now)
return Value(tv.tv_sec * 1000.0 + tv.tv_usec / 1000.0);
}
JS_DEFINE_NATIVE_FUNCTION(DateConstructor::utc)
{
auto arg_or = [&interpreter](size_t i, i32 fallback) { return interpreter.argument_count() > i ? interpreter.argument(i).to_i32(interpreter) : fallback; };
int year = interpreter.argument(0).to_i32(interpreter);
if (year >= 0 && year <= 99)
year += 1900;
struct tm tm = {};
tm.tm_year = year - 1900;
tm.tm_mon = arg_or(1, 0); // 0-based in both tm and JavaScript
tm.tm_mday = arg_or(2, 1);
tm.tm_hour = arg_or(3, 0);
tm.tm_min = arg_or(4, 0);
tm.tm_sec = arg_or(5, 0);
// timegm() doesn't read tm.tm_wday and tm.tm_yday, no need to fill them in.
int milliseconds = arg_or(6, 0);
return Value(1000.0 * timegm(&tm) + milliseconds);
}
}