action update product sale start integer date?

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I'm trying to create a mass action which can modify the product_sale_start of various item with a characteristics. The value needs to be an integer type and i don't know how to introduce the date I need. Shoul I use another type of data such as float or operation?
Thanks.

Hi,

You have to set a timestamp, to have the desired timestamp you can go on this kind of site which convert the date directly: www.timestamp.fr/