Paste the data into Excel as two columns, apply LN to the data, use SLOPE and INTERCEPT to get the constants. That gives you have a linear formula to predict the log of the desired value as a funtion of the log of the input, therefore take EXP on the result. If you want to do it in Perl, have a look at this: Re^5: Data range detection?. There is a coefficients function in that module.

Update: On documentation, I remember that all these numbers are milliseconds, so translating into seconds, minutes, hours, days, and years should be helpful.