In Raspbian in the upper right hand corner there is a clock and when you right click it and select clock settings there is a field for clock format codes and changing this field will display the clock in different formats. What are these formats or how can i find out what they are?(other than on stack exchange)
The list is a little long to paste in full. You can get a full listing using
man date in a terminal window, or take a look through this list posted at manpages.info.