fix: normalize chat completion created timestamps

Author: HavenDV

src/libs/FreeLLM/FreeLlmClient.cs

@@ -1104,7 +1104,7 @@ public static tryAGI.OpenAI.CreateChatCompletionResponse ToCreateChatCompletionR
         {
             Id = string.IsNullOrWhiteSpace(response.ResponseId) ? $"free-{Guid.NewGuid():N}" : response.ResponseId!,
             Choices = choices,
-            Created = response.CreatedAt ?? DateTimeOffset.UtcNow,
+            Created = (int)(response.CreatedAt ?? DateTimeOffset.UtcNow).ToUnixTimeSeconds(),
             Model = string.IsNullOrWhiteSpace(response.ModelId) ? fallbackModelId : response.ModelId!,
             Object = tryAGI.OpenAI.CreateChatCompletionResponseObject.ChatCompletion,
             Usage = CreateUsage(response.Usage),
@@ -1139,7 +1139,7 @@ public static tryAGI.OpenAI.CreateChatCompletionStreamResponse ToCreateChatCompl
         {
             Id = string.IsNullOrWhiteSpace(update.ResponseId) ? $"free-{Guid.NewGuid():N}" : update.ResponseId!,
             Choices = choices,
-            Created = update.CreatedAt ?? DateTimeOffset.UtcNow,
+            Created = (int)(update.CreatedAt ?? DateTimeOffset.UtcNow).ToUnixTimeSeconds(),
             Model = string.IsNullOrWhiteSpace(update.ModelId) ? fallbackModelId : update.ModelId!,
             Object = tryAGI.OpenAI.CreateChatCompletionStreamResponseObject.ChatCompletionChunk,
             Usage = usage is null ? null : CreateUsage(usage.Details),

src/libs/tryAGI.OpenAI/Extensions/OpenAiClient.ChatClient.cs

@@ -58,7 +58,7 @@ public sealed partial class OpenAiClient : Meai.IChatClient
                     yield return new Meai.ChatResponseUpdate
                     {
                         ModelId = chunk.Model,
-                        CreatedAt = chunk.Created,
+                        CreatedAt = DateTimeOffset.FromUnixTimeSeconds(chunk.Created),
                         Contents = [new Meai.UsageContent(CreateUsageDetails(usage))],
                     };
                 }
@@ -76,7 +76,7 @@ public sealed partial class OpenAiClient : Meai.IChatClient
                     _ => null,
                 },
                 ModelId = chunk.Model,
-                CreatedAt = chunk.Created,
+                CreatedAt = DateTimeOffset.FromUnixTimeSeconds(chunk.Created),
                 ResponseId = chunk.Id,
             };
 
@@ -462,7 +462,7 @@ private static Meai.ChatResponse ConvertResponse(
         var chatResponse = new Meai.ChatResponse(messages)
         {
             ModelId = response.Model,
-            CreatedAt = response.Created,
+            CreatedAt = DateTimeOffset.FromUnixTimeSeconds(response.Created),
             ResponseId = response.Id,
             FinishReason = finishReason,
         };