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Countdown to Unix Y2038
The last second a signed 32-bit time_t can represent is 03:14:07 UTC on 19 January 2038.
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Overflow instant: 2038-01-19T03:14:08Z · wrap reading: 1901-12-13T20:45:52Z
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Why the countdown is the wrong question
Most failures will not wait for that second. Any system that schedules, signs, retains or warrants past 2038 is already doing 32-bit arithmetic on a future it cannot name. Use the Backwards Risk calculator with the service life you actually buy.