defaultValueCulture on item type xml date and datetime fields

[ivaigor96]

In DW10 in the item type if you create a datetime field, it will write this to the XML

defaultValueCulture="da-DK" defaultValue="01-01-0001"

The problem is then when you run a local solution with a different culture it will overwrite it

defaultValueCulture="da-DK" defaultValue="01/01/0001"

I suspect it has something to do with this culture being different on different local solutions
When we commit the XML to git, the files start changing when running the local solution

Another issue is that this default value in the UI is different from what it in the XML
I tried changing this value to something else and saved, the XML was updated, but it is still showing 01/01/0001 00:00:00

Should it also not be a date / datetime selector here, not a string for default value ?