Update Date handling.

Author: gk-brown

README.md

@@ -78,7 +78,7 @@ Three of the methods accept the following arguments for specifying custom reques
 The other two methods accept a `body` argument of type `B` that is serialized using `JSONEncoder`. JSON data is encoded and decoded using a date strategy of `millisecondsSince1970`.
 
 ## Query Arguments
-Any sendable value may be used as a query argument and will generally be encoded using its string representation. However, `Date` instances are first converted to a 64-bit integer value representing epoch time. Additionally, array instances represent multi-value parameters and behave similarly to `<select multiple>` tags in HTML forms.
+Any sendable value may be used as a query argument and will generally be encoded using its string representation. However, `Date` instances are encoded using `ISO8601DateFormatter`. Additionally, array instances represent multi-value parameters and behave similarly to `<select multiple>` tags in HTML forms.
 
 The `undefined` property of the `WebServiceProxy` class can be used to represent unspecified or unknown argument values.
 

Sources/Echo/WebServiceProxy.swift

@@ -173,6 +173,10 @@ public class WebServiceProxy {
         responseHandler: @escaping ResponseHandler<T>) async throws -> T {
         var urlQueryItems: [URLQueryItem] = []
 
+        let iso8601DateFormatter = ISO8601DateFormatter()
+
+        iso8601DateFormatter.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
+
         for argument in arguments {
             if (argument.key.isEmpty) {
                 throw WebServiceError(errorDescription: "Invalid key.", statusCode: 0)
@@ -185,7 +189,7 @@ public class WebServiceProxy {
 
                 let value: String
                 if let date = element as? Date {
-                    value = String(describing: Int64(date.timeIntervalSince1970 * 1000))
+                    value = iso8601DateFormatter.string(from: date)
                 } else {
                     value = String(describing: element)
                 }

Tests/EchoTests/EchoTests.swift

@@ -57,7 +57,9 @@ final class EchoTests: XCTestCase {
     func testGet() async throws {
         let webServiceProxy = createWebServiceProxy()
 
-        let now = Date(timeIntervalSince1970: TimeInterval(UInt64(Date().timeIntervalSince1970 * 1000)))
+        let now = Date()
+
+        let date = Date(timeIntervalSince1970: TimeInterval(UInt64(now.timeIntervalSince1970 / 1000) * 1000))
 
         let result: Response = try await webServiceProxy.invoke(.get, path: "test", arguments: [
             "string": "héllo&gøod+bye?",
@@ -66,8 +68,8 @@ final class EchoTests: XCTestCase {
             "numbers": [1, 2, 2, 3, 3, 3],
             "flag": true,
             "dayOfWeek": DayOfWeek.monday,
-            "date": now,
-            "dates": [now],
+            "date": date,
+            "dates": [date],
             "instant": WebServiceProxy.undefined
         ])
 
@@ -77,8 +79,8 @@ final class EchoTests: XCTestCase {
         XCTAssert(result.numbers == [1, 2, 3])
         XCTAssert(result.flag == true)
         XCTAssert(result.dayOfWeek == .monday)
-        XCTAssert(result.date == now)
-        XCTAssert(result.dates == [now])
+        XCTAssert(result.date == date)
+        XCTAssert(result.dates == [date])
     }
 
     func testPost() async throws {