Change the locale in your setup chunck
```{r setup, include=FALSE}
Sys.setlocale("LC_ALL","en_US.UTF-8")
library(flexdashboard)
library(tidyverse)
title_var <- Sys.Date() %>%
format("%d %B %Y") %>%
as.character() %>%
paste0("Update (", . , " @ 23:59 UTC/GMT)")
```
Note that the locale's name might be different depending on the operating system.