Sunday and holidays is best days for online shopping?

It may be, because on Sunday and Holiday we have enough time.

Not necessarily. People like to shop online at any convenient time be it weekdays or weekend. 

One of the reason why people buy more on holidays is because most of the shopping sites offer big discount on holidays during special occasions and festivals.

Sunday is good to buy if there is a family decision involved, otherwise individuals will make a decision with their peers & friends before buying it. Sunday is good for Home item purchases.

Any day is a good day fro shopping.

Depends, for online shopping any day is fine.

I prefer the day when there is a discount or some good offer going on. It does not matter what day is it. I am in a look to grab the best offer on something that I need to buy.

Not actually we can do online shopping anytime any day. We don't need Sundays or holidays for online shopping. 

I love to shop anytime and any day. Moreover, I'm comfortable with both online as well as shopping from a physical store. The only thing that is of the biggest concern is that I should have enough money to spend on my shopping.