Linux find mtime Parameters

When using the mtime parameter in the find command, you will see the official explanation as follows:-mtime n File's data was last modified n * 24 hours ago. see the comments for-atime to understand how rounding affects the interpretation of file modification times.
However, what are the differences between the +,-, and unsigned usage in various reference methods?
Note that n here. If n is a value with a plus sign (+), it means to delete all files created before n days. For example, n = + 1 and today is the 15th day, delete data before the 14th, excluding the 14th. If it is a negative number (n =-1), it is used to delete files within one day, such as the 15th day of the current day, delete data on the 15th. If it is (n =-2), all data from the previous day to the current day will be deleted. For example, if it is on the 15th day, it will be deleted from the 14th day. If there is no symbol, the data of the specified day in the previous n days will be deleted. For example, if (n = 1) and today is the 15th day, all data of the day on the 14th will be deleted. Www.2cto.com note that one day is counted from the current system time, rather than 0-24 hours.