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feat: Date 时区修复 + setUTC* 方法 + Date.UTC 实现

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彭俊皓
2026-06-27 19:03:46 +08:00
parent e7a0d5aa16
commit a75748bff9
3 changed files with 557 additions and 44 deletions
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crates/oxide_builtins/src/date.rs
+307 -43
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@@ -1,4 +1,4 @@
use chrono::{DateTime, Datelike, NaiveDate, NaiveDateTime, Timelike, Utc};
use chrono::{DateTime, Datelike, Local, NaiveDate, NaiveDateTime, Timelike, Utc};
use oxide_kernel::shape_forge::EMPTY_SHAPE_ID;
use oxide_types::object::JsObject;
@@ -70,6 +70,13 @@ fn dt_from_ms(ms: f64) -> Option<DateTime<Utc>> {
DateTime::from_timestamp_millis(ms as i64)
}
fn dt_from_ms_local(ms: f64) -> Option<DateTime<Local>> {
if !ms.is_finite() {
return None;
}
DateTime::from_timestamp_millis(ms as i64).map(|dt| dt.with_timezone(&Local))
}
fn naive_from_ms(ms: f64) -> Option<NaiveDateTime> {
if !ms.is_finite() {
return None;
@@ -102,40 +109,47 @@ pub fn date_constructor<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
let timestamp = if args.len() < 2 {
Utc::now().timestamp_millis() as f64
} else if args.len() > 2 {
let y = vm.coerce_number_bounded(vm.reg(args[1])).unwrap_or(f64::NAN) as i32;
let m = vm.coerce_number_bounded(vm.reg(args[2])).unwrap_or(f64::NAN) as u32;
let d = if args.len() > 3 {
vm.coerce_number_bounded(vm.reg(args[3])).unwrap_or(f64::NAN) as u32
let now = chrono::Local::now();
let y_val = oxide_runtime_api::to_number(vm.reg(args[1]));
let m_val = oxide_runtime_api::to_number(vm.reg(args[2]));
if y_val.is_nan() || m_val.is_nan() {
f64::NAN
} else {
1
let y = y_val.trunc() as i32;
let m = m_val.trunc() as u32;
let d = if args.len() > 3 {
oxide_runtime_api::to_number(vm.reg(args[3])).trunc() as u32
} else {
now.day()
};
let h = if args.len() > 4 {
vm.coerce_number_bounded(vm.reg(args[4])).unwrap_or(f64::NAN) as u32
oxide_runtime_api::to_number(vm.reg(args[4])).trunc() as u32
} else {
0
now.hour()
};
let min = if args.len() > 5 {
vm.coerce_number_bounded(vm.reg(args[5])).unwrap_or(f64::NAN) as u32
oxide_runtime_api::to_number(vm.reg(args[5])).trunc() as u32
} else {
0
now.minute()
};
let sec = if args.len() > 6 {
vm.coerce_number_bounded(vm.reg(args[6])).unwrap_or(f64::NAN) as u32
oxide_runtime_api::to_number(vm.reg(args[6])).trunc() as u32
} else {
0
now.second()
};
let ms = if args.len() > 7 {
vm.coerce_number_bounded(vm.reg(args[7])).unwrap_or(f64::NAN) as u32
oxide_runtime_api::to_number(vm.reg(args[7])).trunc() as u32
} else {
0
now.timestamp_subsec_millis()
};
NaiveDate::from_ymd_opt(y, m + 1, d)
.and_then(|nd| {
nd.and_hms_milli_opt(h, min, sec, ms)
.and_then(|ndt| ndt.and_local_timezone(Utc).earliest())
.and_then(|ndt| ndt.and_local_timezone(Local).earliest())
})
.map(|dt| dt.timestamp_millis() as f64)
.unwrap_or(f64::NAN)
}
} else {
let val = vm.reg(args[1]);
if val.is_string() {
@@ -214,12 +228,22 @@ pub fn date_parse<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
}
// SAFETY: val is a string value.
let s = unsafe { (*val.as_string_ptr()).data.clone() };
let formats = ["%Y-%m-%dT%H:%M:%S%.fZ", "%Y-%m-%dT%H:%M:%S%.f"];
let mut ts = f64::NAN;
for fmt in &formats {
if let Ok(ndt) = NaiveDateTime::parse_from_str(&s, fmt) {
ts = ndt.and_utc().timestamp_millis() as f64;
break;
if let Ok(dt) = chrono::DateTime::parse_from_rfc2822(&s) {
ts = dt.timestamp_millis() as f64;
}
if ts.is_nan() {
let formats = [
"%Y-%m-%dT%H:%M:%S%.fZ",
"%Y-%m-%dT%H:%M:%S%.f",
"%Y-%m-%dT%H:%M:%S%.f%:z",
"%Y-%m-%dT%H:%M:%S%.f%#z",
];
for fmt in &formats {
if let Ok(ndt) = NaiveDateTime::parse_from_str(&s, fmt) {
ts = ndt.and_utc().timestamp_millis() as f64;
break;
}
}
}
if ts.is_nan() {
@@ -229,11 +253,38 @@ pub fn date_parse<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
}
}
}
if ts.is_nan() {
if let Ok(nd) = NaiveDate::parse_from_str(&s, "%Y/%m/%d") {
if let Some(ndt) = nd.and_hms_opt(0, 0, 0).and_then(|n| n.and_local_timezone(Utc).earliest()) {
ts = ndt.timestamp_millis() as f64;
}
}
}
NativeResult::Ok(JsValue::float(ts))
}
pub fn date_utc<H: VmHost>(_vm: &mut H, _args: &[u8]) -> NativeResult {
NativeResult::Ok(JsValue::float(f64::NAN))
pub fn date_utc<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
if args.len() < 3 {
return NativeResult::Ok(JsValue::float(f64::NAN));
}
let y = oxide_runtime_api::to_number(vm.reg(args[1]));
let m = oxide_runtime_api::to_number(vm.reg(args[2]));
if y.is_nan() || m.is_nan() {
return NativeResult::Ok(JsValue::float(f64::NAN));
}
let y = y.trunc() as i32;
let m = m.trunc() as u32;
let d = if args.len() > 3 { oxide_runtime_api::to_number(vm.reg(args[3])).trunc() as u32 } else { 1 };
let h = if args.len() > 4 { oxide_runtime_api::to_number(vm.reg(args[4])).trunc() as u32 } else { 0 };
let min = if args.len() > 5 { oxide_runtime_api::to_number(vm.reg(args[5])).trunc() as u32 } else { 0 };
let sec = if args.len() > 6 { oxide_runtime_api::to_number(vm.reg(args[6])).trunc() as u32 } else { 0 };
let ms = if args.len() > 7 { oxide_runtime_api::to_number(vm.reg(args[7])).trunc() as u32 } else { 0 };
let ts = NaiveDate::from_ymd_opt(y, m + 1, d)
.and_then(|nd| nd.and_hms_milli_opt(h, min, sec, ms))
.and_then(|ndt| ndt.and_local_timezone(Utc).earliest())
.map(|dt| dt.timestamp_millis() as f64)
.unwrap_or(f64::NAN);
NativeResult::Ok(JsValue::float(ts))
}
macro_rules! make_getter {
@@ -268,15 +319,31 @@ macro_rules! make_utc_getter {
};
}
macro_rules! make_local_getter {
($name:ident, $f:expr, $df:expr) => {
pub fn $name<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
let obj = unsafe { &*native_try!(date_this(vm, args)) };
let ms = get_timestamp(obj);
if !ms.is_finite() {
return NativeResult::Ok(JsValue::float($df));
}
match dt_from_ms_local(ms) {
Some(dt) => NativeResult::Ok(JsValue::float(($f)(dt))),
None => NativeResult::Ok(JsValue::float($df)),
}
}
};
}
make_getter!(date_get_time, |dt: DateTime<Utc>| dt.timestamp_millis() as f64, f64::NAN);
make_getter!(date_get_full_year, |dt: DateTime<Utc>| dt.year() as f64, f64::NAN);
make_getter!(date_get_month, |dt: DateTime<Utc>| dt.month0() as f64, f64::NAN);
make_getter!(date_get_date, |dt: DateTime<Utc>| dt.day() as f64, f64::NAN);
make_getter!(date_get_day, |dt: DateTime<Utc>| dt.weekday().num_days_from_sunday() as f64, f64::NAN);
make_getter!(date_get_hours, |dt: DateTime<Utc>| dt.hour() as f64, f64::NAN);
make_getter!(date_get_minutes, |dt: DateTime<Utc>| dt.minute() as f64, f64::NAN);
make_getter!(date_get_seconds, |dt: DateTime<Utc>| dt.second() as f64, f64::NAN);
make_getter!(date_get_milliseconds, |dt: DateTime<Utc>| dt.timestamp_subsec_millis() as f64, f64::NAN);
make_local_getter!(date_get_full_year, |dt: DateTime<Local>| dt.year() as f64, f64::NAN);
make_local_getter!(date_get_month, |dt: DateTime<Local>| dt.month0() as f64, f64::NAN);
make_local_getter!(date_get_date, |dt: DateTime<Local>| dt.day() as f64, f64::NAN);
make_local_getter!(date_get_day, |dt: DateTime<Local>| dt.weekday().num_days_from_sunday() as f64, f64::NAN);
make_local_getter!(date_get_hours, |dt: DateTime<Local>| dt.hour() as f64, f64::NAN);
make_local_getter!(date_get_minutes, |dt: DateTime<Local>| dt.minute() as f64, f64::NAN);
make_local_getter!(date_get_seconds, |dt: DateTime<Local>| dt.second() as f64, f64::NAN);
make_local_getter!(date_get_milliseconds, |dt: DateTime<Local>| dt.timestamp_subsec_millis() as f64, f64::NAN);
make_utc_getter!(date_get_utc_full_year, |ndt: NaiveDateTime| ndt.date().year() as f64, f64::NAN);
make_utc_getter!(date_get_utc_month, |ndt: NaiveDateTime| ndt.date().month0() as f64, f64::NAN);
@@ -296,13 +363,21 @@ make_utc_getter!(
);
pub fn date_get_timezone_offset<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
let _obj = unsafe { &*native_try!(date_this(vm, args)) };
let offset_min = local_offset_minutes();
let obj = unsafe { &*native_try!(date_this(vm, args)) };
let ms = get_timestamp(obj);
let offset_min = local_offset_minutes(ms);
NativeResult::Ok(JsValue::float(offset_min as f64))
}
fn local_offset_minutes() -> i32 {
chrono::Local::now().offset().local_minus_utc() / 60
fn local_offset_minutes(ms: f64) -> i32 {
if !ms.is_finite() {
return 0;
}
let offset = chrono::DateTime::from_timestamp_millis(ms as i64)
.map(|dt| dt.with_timezone(&chrono::Local))
.map(|dt| dt.offset().local_minus_utc())
.unwrap_or(0);
-offset / 60
}
fn get_opt_arg<H: VmHost>(vm: &H, args: &[u8], idx: usize, default: u32) -> u32 {
@@ -332,7 +407,7 @@ pub fn date_set_full_year<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
if !ms.is_finite() {
return NativeResult::Ok(JsValue::float(f64::NAN));
}
let dt = match dt_from_ms(ms) {
let dt = match dt_from_ms_local(ms) {
Some(d) => d,
None => return NativeResult::Ok(JsValue::float(f64::NAN)),
};
@@ -341,7 +416,7 @@ pub fn date_set_full_year<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
let nd = dt
.with_year(v as i32)
.and_then(|x| x.with_month0(m))
.and_then(|x| x.with_day0(d))
.and_then(|x| x.with_day0(if args.len() > 3 { d - 1 } else { d }))
.unwrap_or(dt);
let ts = nd.timestamp_millis() as f64;
set_timestamp(obj, ts);
@@ -355,12 +430,12 @@ pub fn date_set_month<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
if !ms.is_finite() {
return NativeResult::Ok(JsValue::float(f64::NAN));
}
let dt = match dt_from_ms(ms) {
let dt = match dt_from_ms_local(ms) {
Some(d) => d,
None => return NativeResult::Ok(JsValue::float(f64::NAN)),
};
let d = get_opt_arg(vm, args, 2, dt.day0());
let nd = dt.with_month0(v as u32).and_then(|x| x.with_day0(d)).unwrap_or(dt);
let nd = dt.with_month0(v as u32).and_then(|x| x.with_day0(if args.len() > 2 { d - 1 } else { d })).unwrap_or(dt);
let ts = nd.timestamp_millis() as f64;
set_timestamp(obj, ts);
NativeResult::Ok(JsValue::float(ts))
@@ -373,7 +448,7 @@ pub fn date_set_date<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
if !ms.is_finite() {
return NativeResult::Ok(JsValue::float(f64::NAN));
}
let dt = match dt_from_ms(ms) {
let dt = match dt_from_ms_local(ms) {
Some(d) => d,
None => return NativeResult::Ok(JsValue::float(f64::NAN)),
};
@@ -390,7 +465,7 @@ pub fn date_set_hours<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
if !ms.is_finite() {
return NativeResult::Ok(JsValue::float(f64::NAN));
}
let dt = match dt_from_ms(ms) {
let dt = match dt_from_ms_local(ms) {
Some(d) => d,
None => return NativeResult::Ok(JsValue::float(f64::NAN)),
};
@@ -415,7 +490,7 @@ pub fn date_set_minutes<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
if !ms.is_finite() {
return NativeResult::Ok(JsValue::float(f64::NAN));
}
let dt = match dt_from_ms(ms) {
let dt = match dt_from_ms_local(ms) {
Some(d) => d,
None => return NativeResult::Ok(JsValue::float(f64::NAN)),
};
@@ -438,7 +513,7 @@ pub fn date_set_seconds<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
if !ms.is_finite() {
return NativeResult::Ok(JsValue::float(f64::NAN));
}
let dt = match dt_from_ms(ms) {
let dt = match dt_from_ms_local(ms) {
Some(d) => d,
None => return NativeResult::Ok(JsValue::float(f64::NAN)),
};
@@ -459,7 +534,7 @@ pub fn date_set_milliseconds<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult
if !ms.is_finite() {
return NativeResult::Ok(JsValue::float(f64::NAN));
}
let dt = match dt_from_ms(ms) {
let dt = match dt_from_ms_local(ms) {
Some(d) => d,
None => return NativeResult::Ok(JsValue::float(f64::NAN)),
};
@@ -469,6 +544,195 @@ pub fn date_set_milliseconds<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult
NativeResult::Ok(JsValue::float(ts))
}
pub fn date_set_utc_full_year<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
let obj = unsafe { &mut *native_try!(date_this_mut(vm, args)) };
let ms = get_timestamp(obj);
if !ms.is_finite() {
return NativeResult::Ok(JsValue::float(f64::NAN));
}
let ndt = match naive_from_ms(ms) {
Some(n) => n,
None => return NativeResult::Ok(JsValue::float(f64::NAN)),
};
let y = oxide_runtime_api::to_number(vm.reg(args[1])).trunc() as i32;
let m = get_opt_arg(vm, args, 2, ndt.date().month0());
let d = get_opt_arg(vm, args, 3, ndt.date().day0());
let nd = NaiveDate::from_ymd_opt(y, m + 1, if args.len() > 3 { d } else { d + 1 })
.and_then(|date| date.and_hms_nano_opt(ndt.time().hour(), ndt.time().minute(), ndt.time().second(), ndt.time().nanosecond()))
.unwrap_or(ndt);
let ts = nd.and_utc().timestamp_millis() as f64;
set_timestamp(obj, ts);
NativeResult::Ok(JsValue::float(ts))
}
pub fn date_set_utc_month<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
let obj = unsafe { &mut *native_try!(date_this_mut(vm, args)) };
let ms = get_timestamp(obj);
if !ms.is_finite() {
return NativeResult::Ok(JsValue::float(f64::NAN));
}
let ndt = match naive_from_ms(ms) {
Some(n) => n,
None => return NativeResult::Ok(JsValue::float(f64::NAN)),
};
let m = oxide_runtime_api::to_number(vm.reg(args[1])).trunc() as u32;
let d = get_opt_arg(vm, args, 2, ndt.date().day0());
let nd = NaiveDate::from_ymd_opt(ndt.date().year(), m + 1, if args.len() > 2 { d } else { d + 1 })
.and_then(|date| date.and_hms_nano_opt(ndt.time().hour(), ndt.time().minute(), ndt.time().second(), ndt.time().nanosecond()))
.unwrap_or(ndt);
let ts = nd.and_utc().timestamp_millis() as f64;
set_timestamp(obj, ts);
NativeResult::Ok(JsValue::float(ts))
}
pub fn date_set_utc_date<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
let obj = unsafe { &mut *native_try!(date_this_mut(vm, args)) };
let ms = get_timestamp(obj);
if !ms.is_finite() {
return NativeResult::Ok(JsValue::float(f64::NAN));
}
let ndt = match naive_from_ms(ms) {
Some(n) => n,
None => return NativeResult::Ok(JsValue::float(f64::NAN)),
};
let d = oxide_runtime_api::to_number(vm.reg(args[1])).trunc() as u32;
let nd = NaiveDate::from_ymd_opt(ndt.date().year(), ndt.date().month(), d)
.and_then(|date| date.and_hms_nano_opt(ndt.time().hour(), ndt.time().minute(), ndt.time().second(), ndt.time().nanosecond()))
.unwrap_or(ndt);
let ts = nd.and_utc().timestamp_millis() as f64;
set_timestamp(obj, ts);
NativeResult::Ok(JsValue::float(ts))
}
pub fn date_set_utc_hours<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
let obj = unsafe { &mut *native_try!(date_this_mut(vm, args)) };
let ms = get_timestamp(obj);
if !ms.is_finite() {
return NativeResult::Ok(JsValue::float(f64::NAN));
}
let ndt = match naive_from_ms(ms) {
Some(n) => n,
None => return NativeResult::Ok(JsValue::float(f64::NAN)),
};
let h = oxide_runtime_api::to_number(vm.reg(args[1])).trunc() as u32;
let min = get_opt_arg(vm, args, 2, ndt.time().minute());
let sec = get_opt_arg(vm, args, 3, ndt.time().second());
let ms_arg = get_opt_arg(vm, args, 4, ndt.time().nanosecond() as u32 / 1_000_000);
let nd = ndt
.with_hour(h)
.and_then(|x| x.with_minute(min))
.and_then(|x| x.with_second(sec))
.and_then(|x| x.with_nanosecond(ms_arg * 1_000_000))
.unwrap_or(ndt);
let ts = nd.and_utc().timestamp_millis() as f64;
set_timestamp(obj, ts);
NativeResult::Ok(JsValue::float(ts))
}
pub fn date_set_utc_minutes<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
let obj = unsafe { &mut *native_try!(date_this_mut(vm, args)) };
let ms = get_timestamp(obj);
if !ms.is_finite() {
return NativeResult::Ok(JsValue::float(f64::NAN));
}
let ndt = match naive_from_ms(ms) {
Some(n) => n,
None => return NativeResult::Ok(JsValue::float(f64::NAN)),
};
let min = oxide_runtime_api::to_number(vm.reg(args[1])).trunc() as u32;
let sec = get_opt_arg(vm, args, 2, ndt.time().second());
let ms_arg = get_opt_arg(vm, args, 3, ndt.time().nanosecond() as u32 / 1_000_000);
let nd = ndt
.with_minute(min)
.and_then(|x| x.with_second(sec))
.and_then(|x| x.with_nanosecond(ms_arg * 1_000_000))
.unwrap_or(ndt);
let ts = nd.and_utc().timestamp_millis() as f64;
set_timestamp(obj, ts);
NativeResult::Ok(JsValue::float(ts))
}
pub fn date_set_utc_seconds<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
let obj = unsafe { &mut *native_try!(date_this_mut(vm, args)) };
let ms = get_timestamp(obj);
if !ms.is_finite() {
return NativeResult::Ok(JsValue::float(f64::NAN));
}
let ndt = match naive_from_ms(ms) {
Some(n) => n,
None => return NativeResult::Ok(JsValue::float(f64::NAN)),
};
let sec = oxide_runtime_api::to_number(vm.reg(args[1])).trunc() as u32;
let ms_arg = get_opt_arg(vm, args, 2, ndt.time().nanosecond() as u32 / 1_000_000);
let nd = ndt.with_second(sec).and_then(|x| x.with_nanosecond(ms_arg * 1_000_000)).unwrap_or(ndt);
let ts = nd.and_utc().timestamp_millis() as f64;
set_timestamp(obj, ts);
NativeResult::Ok(JsValue::float(ts))
}
pub fn date_set_utc_milliseconds<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
let obj = unsafe { &mut *native_try!(date_this_mut(vm, args)) };
let ms = get_timestamp(obj);
if !ms.is_finite() {
return NativeResult::Ok(JsValue::float(f64::NAN));
}
let ndt = match naive_from_ms(ms) {
Some(n) => n,
None => return NativeResult::Ok(JsValue::float(f64::NAN)),
};
let ms_arg = oxide_runtime_api::to_number(vm.reg(args[1])).trunc() as u32;
let nd = ndt.with_nanosecond(ms_arg * 1_000_000).unwrap_or(ndt);
let ts = nd.and_utc().timestamp_millis() as f64;
set_timestamp(obj, ts);
NativeResult::Ok(JsValue::float(ts))
}
pub fn date_get_year<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
let obj = unsafe { &*native_try!(date_this(vm, args)) };
let ms = get_timestamp(obj);
if !ms.is_finite() {
return NativeResult::Ok(JsValue::float(f64::NAN));
}
match dt_from_ms_local(ms) {
Some(dt) => NativeResult::Ok(JsValue::float((dt.year() - 1900) as f64)),
None => NativeResult::Ok(JsValue::float(f64::NAN)),
}
}
pub fn date_set_year<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
let obj = unsafe { &mut *native_try!(date_this_mut(vm, args)) };
let ms = get_timestamp(obj);
if !ms.is_finite() {
return NativeResult::Ok(JsValue::float(f64::NAN));
}
let dt = match dt_from_ms_local(ms) {
Some(d) => d,
None => return NativeResult::Ok(JsValue::float(f64::NAN)),
};
let y = oxide_runtime_api::to_number(vm.reg(args[1])).trunc() as i32;
let full_year = if (0..=99).contains(&y) { y + 1900 } else { y };
let nd = dt.with_year(full_year).unwrap_or(dt);
let ts = nd.timestamp_millis() as f64;
set_timestamp(obj, ts);
NativeResult::Ok(JsValue::float(ts))
}
pub fn date_to_gmt_string<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
date_to_utc_string(vm, args)
}
pub fn date_to_locale_date_string<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
date_to_date_string(vm, args)
}
pub fn date_to_locale_string<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
date_to_string(vm, args)
}
pub fn date_to_locale_time_string<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
date_to_time_string(vm, args)
}
fn date_to_string_inner<H: VmHost>(vm: &mut H, args: &[u8], format_str: &str, invalid: &str) -> NativeResult {
let obj = unsafe { &*native_try!(date_this(vm, args)) };
let ms = get_timestamp(obj);