Try this:
function DayOfWeekName()
{
dayInt = DayOfWeek();
dayStr =
WriteIf(dayInt == 0, "Sunday",
WriteIf(dayInt == 1, "Monday",
WriteIf(dayInt == 2, "Tuesday",
WriteIf(dayInt == 3, "Wednesday",
WriteIf(dayInt == 4, "Thursday",
WriteIf(dayInt == 5, "Friday"...