Very strange long assignment issue

I have the following piece of test code in my application (using GWT
2.1.0):

Date expiry = new Date();
long expiryTime = expiry.getTime();
expiryTime = expiryTime + (1000 * 60 * 60 * 24 * 90); // 90 days

When I debug this code in Eclipse and I break at line 3, I can see
that the value of expiryTime is 1298645926486. However after adding
the 90 days milisecs to it, the result works out as 1297831991894
(less than before the addition). I tried to just test the following
line:

long test = 1000;

and when I check the value of test in debug, it is negative. The same
happens to the expiry time. What is going on ?????

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