In new lubridate 1.7 which is used in Exploratory, wday/month functions are localized, and by default their output is in your OS’s locale.
To control the locale, you can set locale argument when using them in your mutate step dialog, like following examples.
On Mac for English output:
wday(your_date_column, label=TRUE, locale="en_US")
On Mac for Japanese output:
wday(your_date_column, label=TRUE, locale="ja_JP")
On Windows for English output:
wday(your_date_column, label=TRUE, locale="English_United States")
On Windows for Japanese output:
wday(your_date_column, label=TRUE, locale="Japanese_Japan")
Reference: https://www.tidyverse.org/articles/2017/11/lubridate-1.7.0/