Implement Date.now() static method

- Implement Date.now() static method returning milliseconds since Unix epoch
- Extract Date static method handling into handle_date_static_method in js_date.rs
- Update evaluate_call and evaluate_optional_call to dispatch Date static methods

Author: ssrlive

.gitignore

@@ -1,3 +1,6 @@
+/plan.md
+/brief.md
+/brief_zh.md
 /*.js
 /quickjs
 .vscode/

src/core.rs

@@ -3422,6 +3422,7 @@ fn evaluate_call(env: &JSObjectDataPtr, func_expr: &Expr, args: &[Expr]) -> Resu
                     "Object" => crate::js_object::handle_object_method(method, args, env),
                     "Array" => crate::js_array::handle_array_static_method(method, args, env),
                     "Promise" => crate::js_promise::handle_promise_static_method(method, args, env),
+                    "Date" => crate::js_date::handle_date_static_method(method, args, env),
                     _ => Err(JSError::EvaluationError {
                         message: format!("{} has no static method '{}'", func_name, method),
                     }),
@@ -3576,6 +3577,7 @@ fn evaluate_optional_call(env: &JSObjectDataPtr, func_expr: &Expr, args: &[Expr]
                 match func_name.as_str() {
                     "Object" => crate::js_object::handle_object_method(method_name, args, env),
                     "Array" => crate::js_array::handle_array_static_method(method_name, args, env),
+                    "Date" => crate::js_date::handle_date_static_method(method_name, args, env),
                     _ => Err(JSError::EvaluationError {
                         message: format!("{} has no static method '{}'", func_name, method_name),
                     }),

src/js_date.rs

@@ -399,3 +399,22 @@ pub(crate) fn handle_date_method(obj_map: &JSObjectDataPtr, method: &str, args:
         }),
     }
 }
+
+/// Handle Date static method calls
+pub(crate) fn handle_date_static_method(method: &str, args: &[Expr], _env: &JSObjectDataPtr) -> Result<Value, JSError> {
+    match method {
+        "now" => {
+            if !args.is_empty() {
+                return Err(JSError::TypeError {
+                    message: "Date.now() takes no arguments".to_string(),
+                });
+            }
+            use std::time::{SystemTime, UNIX_EPOCH};
+            let duration = SystemTime::now().duration_since(UNIX_EPOCH).unwrap();
+            Ok(Value::Number(duration.as_millis() as f64))
+        }
+        _ => Err(JSError::EvaluationError {
+            message: format!("Date has no static method '{}'", method),
+        }),
+    }
+}