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Looking over the manual, I can't figure out how to set the date format.
I am using the following to locate folders that are in 'dd-mm-yyyy' name, but realise that it may not be working due to the date format.
Is there any way to set the date format of '-mtime'?
find "${backup_dest}" \
-maxdepth 1 -type d -mtime +3 \
-name '[0-9][0-9]-[0-9][0-9]-[0-9][0-9][0-9][0-9]' \
-execdir mv {} $folder_trash_path/{}-"${site[$i]}" ';'
Old find(1) implementatons and the POSIX standard only allow -mtime parameters that are plain numbers and that refer to a time offset that counts in days.
Modern find(1) implementations permit something like: -mtime -3y2m4d referring to all files that have been modified during the past 3 years + 2 months + 4 days.
If you like to refer to a specific time, then you may only use -newer together with a time stamp reference file that could be created with the touch program.
sfind, which is based on libfind also supports it. BTW: GNU find was the last find implementation that started to implement -exec ... {} +, so GNU find may not be the leading edge regarding to useful features.
findcommand is searching for directories, but your question description refers to files. Which is it?-maxdepth 1throwing you off? (are the directories in question in the $backup_dest directory, or below it?)