[Capistrano] Can i use "Date=`date --d \"1 day ago\" +%Y-%m-%d`" in task?

[Jim]

I wrote a task like:
task :parse_log, :hosts=>"myhostname", :roles=>:jim do
    run "Date=`date --d '1 day ago' +%Y-%m-%d`"
    run "echo '${Date}'"
end

by the way. Can I use function in capistrano?
like:

function myfunction  {
  NOW=`date`
  echo "$NOW : $*" >> $CRONJOBLOG
}

How can I call this function in capistrano?
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