Fixes to date synchronization.

Sources/SQLiteData/Internal/ISO8601.swift

@@ -3,10 +3,16 @@ import Foundation
 extension Date {
   @usableFromInline
   var iso8601String: String {
+    let nextUpDate = Date(timeIntervalSinceReferenceDate: timeIntervalSinceReferenceDate.nextUp)
     if #available(iOS 15, macOS 12, tvOS 15, watchOS 8, *) {
-      return formatted(.iso8601.currentTimestamp(includingFractionalSeconds: true))
+      return
+        nextUpDate
+        .formatted(
+          .iso8601.currentTimestamp(includingFractionalSeconds: true)
+        )
     } else {
-      return DateFormatter.iso8601(includingFractionalSeconds: true).string(from: self)
+      return DateFormatter.iso8601(includingFractionalSeconds: true)
+        .string(from: nextUpDate)
     }
   }
 

Tests/SQLiteDataTests/CloudKitTests/PreviewTests.swift

@@ -43,9 +43,8 @@
         }
       }
 
-      @Test
       @available(iOS 17, macOS 14, tvOS 17, watchOS 10, *)
-      func delete() async throws {
+      @Test func delete() async throws {
         @FetchAll(RemindersList.all, database: userDatabase.database) var remindersLists
 
         try await userDatabase.userWrite { db in

Tests/SQLiteDataTests/DateTests.swift

@@ -0,0 +1,51 @@
+import DependenciesTestSupport
+import Foundation
+import SQLiteData
+import SQLiteDataTestSupport
+import Testing
+
+@Suite(.dependency(\.defaultDatabase, try .database()))
+struct DateTests {
+  @Dependency(\.defaultDatabase) var database
+
+  @Test func roundtrip() throws {
+    let date = Date(timeIntervalSinceReferenceDate: 793109282.061)
+    let insertedRecord = try database.write { db in
+      try Record.insert { Record.Draft(date: date) }
+      .returning(\.self)
+      .fetchOne(db)!
+    }
+    let updatedRecord = try database.write { db in
+      try Record
+        .update(insertedRecord)
+      .returning(\.self)
+      .fetchOne(db)!
+    }
+    #expect(insertedRecord.date == date)
+    #expect(insertedRecord.date == updatedRecord.date)
+  }
+}
+
+@Table
+private struct Record: Equatable {
+  let id: Int
+  var date: Date
+}
+
+extension DatabaseWriter where Self == DatabaseQueue {
+  fileprivate static func database() throws -> DatabaseQueue {
+    let database = try DatabaseQueue()
+    try database.write { db in
+      try #sql(
+        """
+        CREATE TABLE "records" (
+          "id" INTEGER PRIMARY KEY AUTOINCREMENT,
+          "date" TEXT NOT NULL
+        ) STRICT
+        """
+      )
+      .execute(db)
+    }
+    return database
+  }
+}