[R] Cut a within elements by length, not value, of vectors

[btc1]

Hello, I have a vector, "dates", as a series of 3 digit elements, i.e. > date
  [1] 528 528 528 528 528 528 528 528 528 528 528 528 708 708 708 708 708
708
 [19] 708 708 708 708 529 529 529 529 529 529 529 529 529 529 529 529 529
529
 [37] 529 624

I need to convert them into julian, but have to insert a "/" or "-" after
the first number within each element of the vector (5/28 5/28 etc). Found
plenty functions to replace by a pattern but not to cut by a certain number
of digits with an element. Alternately, if I could run all the elements into
one long vector and then cut every one then two digits, that would work as
well.

Thanks.
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