Understanding of Mtime Parameters

The Mtime parameter should be understood as follows:
-mtime N to find the file according to the file change time, n is an integer.
n means that the file change time distance is n days, and-n means that the file change time distance is less than n days, and +n indicates that the file changed time distance before n days.
For example:
-mtime 0 represents files that are currently 0 days away from the file modification time, which is less than 1 days (24 hours) away from the current time.
-mtime 1 represents a file modified from a file that is currently 1 days long, that is, 1 days (24 hours-48 hours) from the current time.
-mtime+1 indicates file modification time is greater than 1 days, that is, 2 days (48 hours) away from the current time file
-mtime -1 means files with a file modification time of less than 1 days, or 1 days (24 hours) from the current time

Why does-mtime+1 mean that files are modified for files greater than 1 days, that is, files that are 48 hours away from the current time, not 24 hours?
Because the N value can only be an integer, that is, the nearest integer greater than 1 is 2, all-mtime+1 is not greater than the current time of 1 days (24 hours), but is greater than the current time of 2 days (48 hours).

Understanding of Mtime Parameters