Alternative way of convert values to strings in a hash

gistfile1.rb

# Old way
hash = {
    "starts_at" => Date.today.to_s,
    "ends_at" => (Date.today + 2.days).to_s
}
# Alternative way
hash = {
   "starts_at" => Date.today,
   "ends_at" => Date.today + 2.days
}

hash.update(hash){|k,v| v.to_s}