Too long row?

Hey,

I'm trying to write the dates (yyyy-mm-dd) from 99 years into one singel row in a textfile. 

By:

WRITE (15,155)(string_date_array(I), char(9), I=1,365000)

155 format ('%ID','',365000a10,a2))

But after a while the dates starts to write to line number 2 in the texfile. Is their any limits of the length of the row? How can I get around it?

All the dates has to be in the same row.