Calculate Mileage For Discrete Date Ranges

I have a list of mileage rates that correspond with different date ranges. For example the mileage rate for March 19, 2008 – July 31, 2008 was 50.5 cents per mile. I have 11 different mileage rates / date ranges from 2000 onwards.

I would like to devise a way that I could input the date and the number of miles travelled into the spreadsheet, then Excel would check the date entered in order to choose the appropriate mileage rate and calculate the dollar amount based on the # of miles input.

Here are the date ranges and rates in the event that anyone is interested in putting something like this together. I would be grateful for an example for one or two of the rates though and hopefully could extrapolate from there.

1/1/00 - 3/31/00 - 32.5 cents per mile
4/1/01 - 12/31/01 - 34.5
1/1/02 - 12/31/02 - 36.5
1/1/03 - 12/31/03 - 36
1/1/04 - 12/31/04 - 37.5
1/1/05 - 8/31/05 - 40.5
9/1/05 - 12/31/05 - 48.5
1/1/06 - 1/31/07 - 44.5
2/1/07 - 3/18/08 - 48.5
3/19/08 - 7/31/08 - 50.5
8/1/08 - current - 58.5