Related: ce78b18b3951797be28d3f607fe1dbbadda96279, #401, #308 Tested with: 50822e6 This very likely has to do with how the locale is set on Linux/Window vs. macOS: https://github.com/machawk1/wail/blob/50822e67c2199aa98b6e51e4b2d703f7d5ac3a6c/bundledApps/WAIL.py#L364-L368 <img width="374" alt="Screen Shot 2019-03-26 at 4 45 28 PM" src="https://user-images.githubusercontent.com/2514780/55032214-c5232d00-4fe6-11e9-8a4f-4f283c0700df.png"> <img width="512" alt="Screen Shot 2019-03-26 at 4 48 27 PM" src="https://user-images.githubusercontent.com/2514780/55032307-00256080-4fe7-11e9-8bff-bfb739b66fef.png"> This needs to be also tested on Windows to see if the same issue occurs.