Hi omaruane,
seems like the column is being cast to a float number and this is the basic knowage representation for float numbers.
If you want to keep the field as a number but you want to change the visible format inside a cockpit table just go to the dataset view inside the widget editor.
Select the column "day" and click on the paintbrush button to get inside the style panel.
There you should find the format you want without decimal values.
Otherwise you can change the data format you get to "string" or to a common date format and you should see it correctly.
Regards