> For the complete documentation index, see [llms.txt](https://docs.starcounter.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.starcounter.io/2.3.1/cookbook/timestamp-on-object-creation.md).

# Timestamp on Object Creation

Sometimes, it may be useful to have a timestamp of when a database object is created. This can be done using an abstract class with a constructor that sets the timestamp.

In code, it would look something like this:

```csharp
[Database]
public abstract class BaseOfAllOtherClasses 
{
    public DateTime Inserted { get; set; }

    public BaseOfAllOtherClasses() 
    {
        Inserted = DateTime.Now;
    }
}

public class Foo : BaseOfAllOtherClasses {}
public class Bar : BaseOfAllOtherClasses {}
```

From this, it is possible to get when all the instances were created chronologically by using the following query:

```sql
SELECT b.Inserted FROM BaseOfAllOtherClasses e ORDER BY e.Inserted
```


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