I linked to that one image...
Yes, there is only one image, but that image shows 2 additional skins, while the OP only mentioned a weather skin patch.
So to accomplish what they wants for the date formatting, they don't need to edit the weather skin, or the variables file, but instead they must edit "DateTime/DateTime-Large.ini" file as mentioned above.
The other changes you suggested for the weather skin are all valid options, but the date format is completely different.