Hmmm
from the JavaDoc:
Date(long date)
Allocates a Date object and initializes it to represent the specified number of milliseconds since the standard base time known as "the epoch", namely January 1, 1970, 00:00:00 GMT.
long getTime()
Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this Date object.
Seems to me if you play with those and 20-year-seconds, you should be able to work it out.
Good luck!