Change format "completion date"

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as graph shows, how can i change the completion date format which can only shows month and year? it’s better to use custom script.

Kind regards
Jack

Anyone knows it?

i want to see anyone can find a solution for this one.

i want to see the format be “MM/YY”.

Anyone knows?

i want someone to look at this question.

anyone knows it?

have you found the answer?