Sheets date format dd-mm-yyyy - time, it seems, is at war with me.

Sheets date format dd-mm-yyyy - time, it seems, is at war with me.

Hi,

I'm trying to set the format of a column to the date format we use here: dd-mm-yyyy.

Unfortunately, this format does not show up in the options. There's no specification in Settings to specify it either, I can't seem to set a custom format, and while in my Account I have found and set this date format, it simply does not show up anywhere in Sheet, or elsewhere. 

Any suggestions?