remove from array past dates

I want to remove from the following array any dates before 2021 The array is : Array ( [0] => Array ( [0] => 2017-07-15 [1] => 2017-07-29 [2] => Reserved ) [1] => Array ( [0] => 2017-07-30 [1] => 2017-08-31 [2] => Reserved ) [2] => Array ( [0] => 2017-08-31 [1] => 2017-09-02 [2] => Reserved ) [3] => Array ( [0] => 2017-10-08 [1] => 2017-10-18 [2] => Reserved - Michael ) [4] => Array ( [0] => 2018-03-25 [1] => 2018-04-04 [2] => Blocked ) [5] => Array ( [0] => 2018-05-27 [1] => 2018-06-03 [2] => Reserved ) [6] => Array ( [0] => 2018-06-13 [1] => 2018-06-23 [2] => Reserved ) [7] => Array ( [0] => 2018-06-30 [1] => 2018-07-07 [2] => Reserved ) [8] => Array ( [0] => 2021-07-07 [1] => 2021-07-21 [2] => Blocked ) [9] => Array ( [0] => 2021-09-02 [1] => 2021-09-23 [2] => Reserved ) [10] => Array ( [0] => 2023-01-01 [1] => 2024-01-01 [2] => Blocked ) ) so the new array will look Array ( [0] => Array ( [0] => 2021-07-07 [1] => 2021-07-21 [2] => Blocked ) [1] => Array ( [0] => 2021-09-02 [1] => 2021-09-23 [2] => Reserved ) [2] => Array ( [0] => 2023-01-01 [1] => 2024-01-01 [2] => Blocked ) ) and convert it to the following array Array ( [0] => Array ( [check_in] => 2021-07-07 [check_out] => 2021-07-21 [summary] => Blocked ) [1] => Array ( [check_in] => 2021-09-02 [check_out] => 2021-09-23 [summary] => Reserved ) [2] => Array ( [check_in] => 2023-01-01 [check_out] => 2024-01-01 [summary] => Blocked ) ) All this will be in php code