Import time series data with uneven dates

I am trying to import a file of daily index closing prices in business time
which excludes weekends and holidays so deltat is not constant. My file
looks like the following:
date        close
2003.0055   47.05
2003.0082	45.71
2003.0164   43.45
2003.0192   42.96
2003.0219   44.56
2003.0247   42.99
2003.0274   42.28
2003.0356   41.74
etc.

From what I saw in the EuStockMarkets file, it appears that they are also

using years and fractions of years as the measure of time. How do I read my
file and still keep 'date' as the date?

Thanks!

A. Andres
95 Wellington St W
Toronto, Ontario
M5J 2N7