Day of the week

With the following command you get the numerical day of the month:

def text = Calendar.getInstance().get(Calendar.YEAR)+"-"+
Calendar.getInstance().get(Calendar.MONTH)+"-"+
Calendar.getInstance().get(Calendar.DAY_OF_MONTH)+" "+
Calendar.getInstance().get(Calendar.HOUR_OF_DAY)+":"+
Calendar.getInstance().get(Calendar.MINUTE)+":"+
Calendar.getInstance().get(Calendar.SECOND));
show(text)

But how to determine the Day of the Week?

I would like to have something like this:

switch(Day) {
case Monday: .... ; break
case Tuesday: .... ; break
case Wednesday: .... ; break
case Thursday: .... ; break
case Friday: .... ; break
case Saturday: .... ; break
case Sunday: .... ; break
}

Thanks in advance.

Related to this previous subject : it's another constant from Calendar

I think it's 1=sunday, 2=monday, etc., but not sure

Sometimes it's amazing, it is that simple!
Thanks!