What to use the priceValidUntil when data markup?

When checking structured data Shema.org get

It is recommended to fill in the priceValidUntil. Specify a value, if known.

priceValidUntil - date (in ISO 8601 format), after which the price will cease to operate. Information about the product may not appear, if the property priceValidUtil date that has already passed.

Can't understand what date to specify in this field
March 19th 20 at 09:23
3 answers
March 19th 20 at 09:25
You have a promotional product with a discount that ends at a certain day?
- Then you it is advisable to fill in this variable

If you have a product with a standard price and you don't know when the price will change
- Then you do not need to fill this variable

For the future, at the docks of words like "Recommended", "Required", "Desirable" have demonstrative force and they need to be taken literally
I mean?)) Field is blank - Google puts a red triangle. are you talking about, what other index power?))
that increased for you:
5d34e509767d1595903465.png - Cierra30 commented on March 19th 20 at 09:28
it is better to fill to make Google shut up. you can put a certain date on all products or to current day +10 days for example. - maud_Herzog commented on March 19th 20 at 09:31
March 19th 20 at 09:27
So put, a direct code and let Google choke)))
Some very clever doing the calculations on the server from date of receipt at the warehouse, plus three years or, for example, if the products plus a month.
But if the judge sensibly, a priest with Google not crack, do IT for JUST ONE extra operation on the server??? These data will NEVER BE NEEDED, except for Google.
Poet Google is a forest and gets the necessary tsifirki and we do more useful things.
<div itemprop="offers" itemscope="" itemtype="http://schema.org/Offer">
 <meta itemprop="priceValidUntil" content="2029-12-31">
March 19th 20 at 09:29
In-store price of the product is considered to be every day based on the Euro (since the product is strongly attached to him) if I install priceValidUntil for a day, will Google and ankex to think that the goods (price) is no longer available. In short I do not know what to do , how to be not to screw up seo ?

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