An Auction System Needs a Central Clock

An Auction System Needs a Central Clock

An auction system either live or timed runs by the clock. In a live auction, one often runs calls on a bid according to a clock. In a timed auction, you start and end an auction by the clock, and you show the users a countdown timer.

An Auction Runs by A Clock

An auction system either live or timed runs by the clock. In a live auction, one often runs calls on a bid according to a clock. In a timed auction, you start and end an auction by the clock, and you show the users a countdown timer.

Browser Times Cannot Be Trusted

In a browser, 

new Date()gives you the user local time, according to the user's computer local time. As users reside in different time zones, and moreover may have inaccurate computer clock, or they may just intentionally modify that clock, the local time will be different.

Obviously, one cannot let the user observe any time-dependent functionality, and make any time-dependent action, based on a clock which is the same for all users of the auction system.

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