what's wrong with my cron command?

In my cron file (Mac, El Capitan) I have a line that simply updates a file name with a date every day.

0 1 * * * mv /Users/me/0backup* /Users/me/0backup_$(date +"\%m-\%d-\%y")

This allows me to quickly check that backups have been done. This seems to work fine on other machines, but on this particular machine it works (the file name DOES get updated), but every day when it is executed I get mailed errors:

/bin/sh: -c: line 0: unexpected EOF while looking for matching `"'
/bin/sh: -c: line 1: syntax error: unexpected end of file

What's going on? Why am I getting these errors?