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Here you go:

select date in $(for i in backups/*.tar.bz2;do #Glob eliminates need to list all files
                 date=${i/Complete Backup /} #Remove "Complete Backup "
                 date=${date%%.*} #Remove ".tar.bz2"
                 date=${date/ /,} #Substitue , for space
                 echo $date #Echo the date for sed
               done|sed -e 's/\([0-9]\+\)-\([0-9]\+\)-\([0-9]\+\)$/\1:\2:\3/'|sort -r);do
    echo "$date"
done

One more thing: if you're using this for a select loop, how are you going to tell the different dates apart when they're space-separated? I mean you use space to separate the date from the time as well so this might be a source of confusion.

Edit

• Added sorting of the dates from newest to oldest since your comments indicate that you need them sorted that way.
• Added code to separate date and time by a comma so that select can tell a date and time pair from a new entry altogether.
• Wrapped the whole in a select loop.

Here you go:

dates=($(for i in backups/*.tar.bz2;do #Glob eliminates need to list all files
             date=${i/Complete Backup /} #Remove "Complete Backup "
             date=${date%%.*} #Remove ".tar.bz2"
             date=${date/ /,} #Substitue , for space
             echo $date #Echo the date for sed
         done|sed -e 's/\([0-9]\+\)-\([0-9]\+\)-\([0-9]\+\)$/\1:\2:\3/'|sort -r|xargs echo))
select date in ${dates[@]};do
    echo "$date"
done

One more thing: if you're using this for a select loop, how are you going to tell the different dates apart when they're space-separated? I mean you use space to separate the date from the time as well so this might be a source of confusion.

Edit

• Added sorting of the dates from newest to oldest since your comments indicate that you need them sorted that way.
• Added code to separate date and time by a comma so that select can tell a date and time pair from a new entry altogether.
• Wrapped the whole in a select loop Stored the dates into an array which is then iterated over by a select loop to avoid having to re-parse the dates for each re-run of the loop.

Here you go:

select date in $(for i in backups/*.tar.bz2;do
                   date=${i/Complete Backup /} #Remove "Complete Backup "
                  date=${date%%.*} #Remove ".tar.bz2"
                  date=${date/ /,} #Substitue , for space
                  echo $date #Echo the date for sed
                done|sed -e 's/\([0-9]\+\)-\([0-9]\+\)-\([0-9]\+\)$/\1:\2:\3/'|sort);do
    echo "$date"
done

One more thing: if you're using this for a select loop, how are you going to tell the different dates apart when they're space-separated? I mean you use space to separate the date from the time as well so this might be a source of confusion.

Edit

• Added sorting of the dates since your comments indicate that you need them sorted.
• Added code to separate date and time by a comma so that select can tell a date and time pair from a new entry altogether.
• Wrapped the whole in a select loop.

Here you go:

select date in $(for i in backups/*.tar.bz2;do #Glob eliminates need to list all files
                 date=${i/Complete Backup /} #Remove "Complete Backup "
                 date=${date%%.*} #Remove ".tar.bz2"
                 date=${date/ /,} #Substitue , for space
                 echo $date #Echo the date for sed
               done|sed -e 's/\([0-9]\+\)-\([0-9]\+\)-\([0-9]\+\)$/\1:\2:\3/'|sort -r);do
    echo "$date"
done

One more thing: if you're using this for a select loop, how are you going to tell the different dates apart when they're space-separated? I mean you use space to separate the date from the time as well so this might be a source of confusion.

Edit

• Added sorting of the dates from newest to oldest since your comments indicate that you need them sorted that way.
• Added code to separate date and time by a comma so that select can tell a date and time pair from a new entry altogether.
• Wrapped the whole in a select loop.

Here you go:

for i in /backups/*.tar.bz2;do
    date=${i/Complete Backup /} #Remove "Complete Backup "
    date=${date%%.*} #Remove ".tar.bz2"
    echo $date #Echo the date for sed
done|sed -e 's/\([0-9]\+\)-\([0-9]\+\)-\([0-9]\+\)$/\1:\2:\3/'|xargs echo

One more thing: if you're using this for a select loop, how are you going to tell the different dates apart when they're space-separated? I mean you use space to separate the date from the time as well so this might be a source of confusion.

As a possible workaround, you can pass the -d switch to xargs and specify a different delimiter instead of the default (space). You can thus say (for instance): ...|xargs -d',' echo

Here you go:

select date in $(for i in backups/*.tar.bz2;do
                  date=${i/Complete Backup /} #Remove "Complete Backup "
                  date=${date%%.*} #Remove ".tar.bz2"
                  date=${date/ /,} #Substitue , for space
                  echo $date #Echo the date for sed
                done|sed -e 's/\([0-9]\+\)-\([0-9]\+\)-\([0-9]\+\)$/\1:\2:\3/'|sort);do
    echo "$date"
done

One more thing: if you're using this for a select loop, how are you going to tell the different dates apart when they're space-separated? I mean you use space to separate the date from the time as well so this might be a source of confusion.

Edit

• Added sorting of the dates since your comments indicate that you need them sorted.
• Added code to separate date and time by a comma so that select can tell a date and time pair from a new entry altogether.
• Wrapped the whole in a select loop.