excel - Optimizing a date conversion loop -


i have set of data (n), 1500 items long filled dates in dd.mm.yyyy format excel not regognize. goal change them excel can work with, how it.

function date_to_excel() call public_dims  dim date_i string date_array = thisworkbook.sheets("spread").range(cells(7, 5), cells(7 + n, 5))  = 0 n date_i = thisworkbook.sheets("spread").cells(7 + i, 5)     if date_i <> ""     date_array = split(date_i, ".")     date_i = date_array(1) & "/" & date_array(0) & "/" & date_array(2)     thisworkbook.sheets("spread").cells(7 + i, 5) = date_i     end if next  end function

the function works allright, takes long time. what askingfrom community ideas on how optimize loop. have tried adding entire range dates array , looking through that, doesn't seem compatible method of changing date format (the date_i = line near end).

you can use text columns functionality dmy column format. 

thisworkbook.sheets("spread").range("e7:e" & 7 + n).texttocolumns _                                 datatype:=xldelimited, fieldinfo:=array(1, xldmyformat)

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