I'm confused about this sign. It states working hours. The first part is easy: weekdays is 9:30 to 20:00. The second part is strange. Instead of saying 週末・祭日 (weekends and holidays), it says "Sundays and holidays". Which leave me with the question: what about Saturday?
- Is it considered weekend?
- Is 日曜 sometimes used to describe weekends?
- Is it customary in some places to work on Saturday in Japan (like we have some shops open on Saturday with shorten hours but closed on Sunday)?
- Is it just quirk of some random store and I just got lucky and confused on nothing?
- Or is there something else?

