1.10.0 you are able to set custom date format for the holidays. Visit
Layouts tab and under
Holiday date format you can insert your custom format.
Visit date cheatsheet here to see supported format:
Please note that default value is
LL which means the day name changes based on the language you select. Some formats do not support multi language support.
If you want to add custom text between format, add them inside
. For example
D[.]M[.]YYYY will output