dt_1=2022-02-18 dt_2=2023-08-28 dt_1_sec=$( date -d $dt_1 +%s ) dt_2_sec=$( date -d $dt_2 +%s ) dt_d_sec=$(( dt_2_sec - dt_1_sec )) dt_d_day=$(( dt_d_sec / 86400 )) echo "There are $dt_d_day days between $dt_1 and $dt_2"
date -d: $ date -d 'next friday + 2 days' +%F