Localization in Coda
In the United States, Sunday is counted as the first day of the week. In other countries, it is common for Monday to be counted as the first day of the week.
For those of you living in a Country where Monday is the first day of the week, WeekDay() will be a useless formula for you without adding a -1 to the result. Use IsoWeekDay() instead.
Having formulas (and other things like currencies, time, right-to-left language support, etc.) support how other countries and cultures display and understand data is called localization.
There have been many requests for further localization within Coda, and while some strides have been made, there are still lots of improvements Coda can make to support non-US users.