i want to change date format to text and export to excel

please i need seome help!

Mycode:

$start = Carbon\Carbon::createFromFormat('d-m-Y', '01-02-2019')->firstOfMonth();
$end = Carbon\Carbon::createFromFormat('d-m-Y', '01-02-2019')->lastOfMonth(); 

i want change date format 01-02-2019 to Day1 and etc export to excel. sorry for my bad english.

via Chebli Mohamed