If you want to see the Y2K38 bug in action for yourself, find an iPhone. This may work for other phones, or the iPhone may one day be updated to fix this. But for now, the built-in stopwatch on the iPhone piggybacks on the internal clock and stores its value as a signed 32-bit number. The reliance on the clock means that, if you start the stopwatch and then change the time forward, the time elapsed on the stopwatch will suddenly jump forward. By repeatedly moving the time and date on your phone forward and backward, you can ratchet up the stopwatch at an alarming rate, until it hits the 32-bit
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