Post.create(id: 1, created_at: Date.today, updated_at: Date.today-1)
Post.create(id: 2, created_at: Date.today-1, updated_at: Date.today)
Post.create(id: 3, created_at: Date.today, updated_at: Date.today-1)
Post.create(id: 4, created_at: Date.today-1, updated_at: Date.today)
