How do I get the difference of time and/or date using JavaScript?

Hi All,
I have four user text entry values (Date and Time) which require a difference to be performed on them.  The results would be put into a fifth text box named "Burn_Time". The entries are
Start_Date, Start_Time, Stop_Date, and Stop_Time.
How do I calculate the elapsed time between the entries?  For ease of calculations I surmised putting the values in 24 hour format would be helpful (not sure if this is true or not).
Here is an example:
Start_Date = 2012-04-10
Start_Time = 10:00
Stop_Date = 2012-04-12
Stop_Time = 10:00
Burn_Time = 48 (hours).
Any help would be greatly appreciated!

Here's the first in a series of three tutorials on the subject: http://acrobatusers.com/tutorials/date_time_part1

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