Coba:
SELECT * FROM `msr_bills`
WHERE STR_TO_DATE(bill_date, '%d-%m-%Y')
BETWEEN STR_TO_DATE('15-09-2021', '%d-%m-%Y') AND STR_TO_DATE('23-09-2021', '%d-%m-%Y') ;
https:// /dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_str-to-date
Saat Anda menyimpan data dalam format teks, Anda harus selalu mengonversinya ke format tanggal yang benar