True, but there's a reason Time::Piece was placed in core, and it ain't because Time::gmtime had feature bloat.

Besides the aforementioned wday(), which provides a one-indexed numerical value for the day of the week, Time::Piece also provides _wday() and day_of_week() for getting the zero-indexed value, as well as fullday() to get the full name of the day, and day() and wdayname() for an abbreviated version of the name.