Max int32 is 2147483647 and minimum int32 is -2147483647, if you overflow you go to the beginning of the range so to -2147483647, if you subtract 2147483647 sec

Max int32 is 2147483647 and minimum int32 is -2147483647, if you overflow you go to the beginning of the range so to -2147483647, if you subtract 2147483647 seconds from January 1 1970 you will arrive at 13 December 1901.