Difference between ctime 1 and ctime +1 in find command

Question

If I run the following command:

find . -name "*.jar" -type f -ctime +1

I get no results back, whereas if i run:

find . -name "*.jar" -type f -ctime 1

I get results.

Answer 1

That means all the jar files in the directory had status changes less than 48 hours ago.

Detailed explanation

According to the find man page,

-ctime n
    File's status was last changed n*24 hours ago.

And ...

When find figures out how many 24-hour periods ago the file was 
last accessed, any fractional part is ignored, so to match -atime +1, 
a file has to have been accessed at least two days ago.

And elsewhere ...

+n for greater than n

Therefore -ctime +1 means the file status must have changed at least 48 hours ago.