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+# ABP Framework 4.x to 5.0 Migration Guide
+
+## MongoDB
+
+Framework will serializer the datetime based on [AbpClockOptions](https://docs.abp.io/en/abp/latest/Timing#clock-options) start from 5.0, before `DateTime` values in MongoDB are [always saved as UTC](https://mongodb.github.io/mongo-csharp-driver/2.13/reference/bson/mapping/#datetime-serialization-options).
+
+You can disable this behavior by configure `AbpMongoDbOptions`.
+```cs
+services.Configure<AbpMongoDbOptions>(x => x.UseAbpClockHandleDateTime = false);
+```