string generation appended datetime

[orbitronics_]

how do i generate a number from 1 to 9999 as a string appended to a datetime and then start from 1 the next day

eg 0001-24-07-2019, 0002-24-07-2019, 0003-24-07-2019....9999-24-07-2019 then 0001-25-07-2019, 0002-25-07-2019...9999-25-07-2019......

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