2  2473 
In traditional UNIX implementations , time_t was an int, and the int was signed 32 bits. The count starts with 0:00:00 on January 1, 1970, universal time, as 0 seconds.
Therefore, the maximum value is (2^31−1) = 2,147,483,647, and it can handle 2,147,483,647 seconds (≒ 68 years, until 3:14:07 on January 19, 2038).
If the time_t type is changed to a signed 64-bit integer type, the maximum value is (2^63-1) = 9,223,372,036,8 54,775,807, and can be used up to 300 billion years in the Christian era.
Based on this, it is 36 bits to be able to count until the end of 3038.
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The whole thread doesn't make sense without the original post. It isn't appropriate to remove the question. The discussion may benefit others as well. Same thing noticed here.
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