TimeStamp of new blips appear as "December 31st 1969" until the client is refreshed

<b>What steps will reproduce the problem?</b>
1. Load a wave in a WiaB client
2. Wait for someone to post a blip, or post one yourself using a second account
3. Check the timestamp on the blip

<b>What is the expected output? What do you see instead?</b>
I expect that the date it is created should be shown.
I see "December 31st 1969"

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Issue imported from http://code.google.com/p/wave-protocol/issues/detail?id=180

Owner: ano...@google.com
Label: Type-Defect
Label: Priority-Medium
Stars: 3
State: open
Status: Accepted