Returns the short form of the weekday name of the date specified, in the current locale language
string uWeekdayNameShort([modifiers])
uWeekdayNameShort("now") // returns current weekday name
uSetLocale("English") uWeekdayNameShort("1969-03-13 10:22:23.231") //returns "Thu"
uSetLocale("German") uWeekdayNameShort("1969-03-13 10:22:23.231") //returns "Don"