As a rule: on weekdays at weekends ...but.... on weekends = on weekend days, i.e. Saturday or Sunday or both at weekends = the whole weekend What do you do at weekends? What do you do on weekdays? What do you do during the week?

On weekends, on weekdays, on a weekday

for week days and weekends, Americans use "on" but British people use "at". So look at the examples below: i have to get up early on weekdays but i can stay in bed late on weekends. at weekdays, i usually spend the whole day out. They usually go windsurfing at weekends. and sometimes u may use (the) between at and weekends(weekdays). ;)

It usually depends on the context in which they are written. like i like to hangout with my friends on weekends. i will go to the church on this weekend. this gate is closed on weekdays. so on weekend/ on weekends/ on weekdays/ on a weekday is used instead of at weekend.