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My solution: (proved in ps 1.7)

in your database ( use phpMyAdmin for example) go to the table 

ps_product_shop

  and  change the attribute 

date_add

to a past, present or future date.

be aware, in the table ps_product_shop only ACTIVE products are listed. 

The Duration of time how long a product is marked as new is 20 days as default. To change go to:

 Backend --> (Shop-)Preferences --> Products

My solution: (proved in ps 1.7)

in your database ( use phpMyAdmin for example) go to the table 

ps_product_shop

  and  change the attribute 

date_add

to a past or future date.

be aware, in the table ps_product_shop only ACTIVE products are listed. 

The Duration of time how long a product is marked as new is 20 days as default. To change go to:

 Backend --> (Shop-)Preferences --> Products

My solution: (proved in ps 1.7)

in your database ( use phpMyAdmin for example) go to the table 

ps_product_shop

  and  change the attribute 

date_add

to a past or future date.

be aware, in the table ps_product_shop only ACTIVE products are listed. 

To change the Duration of time how long a product is marked as new is 20 days as default. To change got to

 Backend --> (Shop-)Preferences --> Products

My solution: (proved in ps 1.7)

in your database ( use phpMyAdmin for example) go to the table 

ps_product_shop

  and  change the attribute 

date_add

to a past or future date.

be aware, in the table ps_product_shop only ACTIVE products are listed.