decide on

I decide on the date.

私は日付を決めます

I decide on the date in the evening.

私は夕方、日付を決めます

I decide on the date at home in the evening.

私は夕方、家で、日付を決めます

I decide on the date at home in the evening after checking the schedule with my family.

私は夕方、家で家族と日程を確認したあと、日付を決めます

I decide on the date together at home in the evening after checking the schedule with my family.

私は夕方、家で家族と日程を確認したあと、一緒に日付を決めます