The most busy and famous shopping streets are Kalverstraat (between Dam and Muntplein) and Nieuwendijk (between Dam and Central Station).
Most shops are open every day.
Monday: from 1 pm to 6 or 8 pm
Tueday to Friday: from 9 am to 6 or 8 pm
Saturday: from 9 am to 5 pm
Contrary to other cities in The Netherlands, the shops in the centre are open on Sunday from 12 am to 5 pm
The Nieuwendijk shopping street is a bit of everything.
Not every tourist will visit the first stretch that starts at the Singel canal. That end is not the best part of the street with some seedy businesses and room rentals. But once across the Martelaarsgracht a number of cheap food joints start the better section that really starts from the Haringpakkersteeg to the Dam square.
You'll find a supermarket, C&A and even McDonalds.
As it is a crowded street during shopping hours, watch your belongings; the small alleys to either the Damrak or the Nieuwezijds Voorburgwal are ideal get-a-ways for pick pockets.
That long pedestrian street where you could find the McDonalds (also housed one of the most popular public toilet for EUR0.50 in the area aside from of course being a fastfood resto) and other fastfood stands and like Subway and other local ones - is a very popular shopping street.
If you're like me who normally goes on light during travels bringing only about 3 shirts and 2 pants cuz I know am going to shop for clothes later - well, good news - this shopping street has a lot of stores both local and international brands like C&A and that store I think New York where I bought lots of shirts as I ran out of something to wear already costing from EUR5 up, pants at EUR29 up.
It's that street at the Dam Square right beside the famous coffeeshop also beside the Nieuwe Kerk or "new church" which is again near the Royal Palace.
Of course aside from this street you'll find several other shopping streets and malls around the city.