How can I change dateformat for auto-completition in Writer?

[JuliusCaptain]

Dear Community Members,

I would like to change the dateformat shown on the sceenshot to a longer one, like “2019.januar.16” instead “2019-01-16”. How can I?

Thanks in advance,
Julius

[Platterbaff]

See Mike Kaganski’s answer at How do I change the default date/time format?.