Why is the find command not working?

Question

linux

Why does this command Doesn't delete the necessary files Tried mtime and ctime ls -lc output
find . -type f -ctime +30 -delete

[email protected]:~/backup_mysql/30-04-2021# ls -lc
total 12564
-rw-r--r-- 1 root root 1829972 Apr 30 17:00 17-00-01.tar.bz2
-rw-r--r-- 1 root root 1832426 Apr 30 18:00 18-00-01.tar.bz2
-rw-r--r-- 1 root root 1832644 Apr 30 19:00 19-00-01.tar.bz2
-rw-r--r-- 1 root root 1836240 Apr 30 20:00 20-00-02.tar.bz2
-rw-r--r-- 1 root root 1838100 Apr 30 21:00 21-00-01.tar.bz2
-rw-r--r-- 1 root root 1839485 Apr 30 22:00 22-00-01.tar.bz2
-rw-r--r-- 1 root root 1840507 Apr 30 23:00 23-00-01.tar.bz

Answer 1

Because you need -ctime +29
$ man find

...
-atime n
File was last accessed n*24 hours ago. 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.
...
-ctime n
File's status was last changed n*24 hours ago. See the comments for -atime to understand how rounding affects the
interpretation of file status change times.