As most others have said, the main thing is: give students enough time to get the assignment done. Given that, no deadline is too bad.

Other than that, I think a good deadline should be at or near the "end of working hours" (or at the very start, which basically is the same). Because that maximasis the student's capacity for time management. Most time we like to "flow", so planning a full day for a given assignment is normal. And if they need to use the last day (not the best idea but still a possibility) allow them. For most people that is at/after sundown. People working nights know they are doing it different and will adjust as usual for them.

As to the day. Do you do classes on weekends? So fine, make a deadline on sunday. You do not? So, why would you expect students to be working on a sunday then? Students may have days off too, no? Set the deadline for a regular working day, please. Sure, students use weekends (I did, I do, I will, I hope) but it is their choice.

As most others have said, the main thing is: give students enough time to get the assignment done. Given that, no deadline is too bad.

Other than that, I think a good deadline should be at or near the "end of working hours" (or at the very start, which basically is the same). Because that maximises the student's capacity for time management. Most of us like to "flow", so planning a full day for a given assignment is normal. And if they need to use the whole last day (not the best idea but still a possibility) allow them. For most people that is at/after sundown. People working nights know they are doing it different and will adjust as usual for them.

As to the day. Do you do classes on weekends? So fine, make a deadline on sunday. You do not? So, why would you expect students to be working on a sunday then? Students may have days off too, no? Set the deadline for a regular working day, please. Sure, students use weekends (I did, I do, I will, I hope) but it is their choice not your's