Hmm... could indeed be, if the OP is using a more "exotic" locale / language that isn't supported by the font in order to display the day of the week string. If that's the case, he should probably check the Using Unicode With Rainmeter section on this page:it could be related to file encoding.
https://docs.rainmeter.net/tips/unicode-in-rainmeter/
Statistics: Posted by Yincognito — Today, 9:01 am
