It's a pain. Apple does not like to have plain old users have
access to the numbers that constitute the number of seconds from
1904 (MacOS) or 1970 (UNIX).
-- secondsSince:
-- Returns the number of seconds since 'aDate'
on secondsSince(aDate)
set curr to (current date)
set elapsed to (curr - aDate)
return elapsed
end secondsSince
