This should display 'Tue':
new SimpleDateFormat("EEE").format(new Date());
This should display 'Tuesday':
new SimpleDateFormat("EEEE").format(new Date());
This should display 'T':
new SimpleDateFormat("EEEEE").format(new Date());
So your specific example would be:
new SimpleDateFormat("yyyy-MM-EEE").format(new Date());
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