käyttöpäivänä

Käyttöpäivänä is a Finnish noun phrase meaning “on the day of use” or “the day of use.” It is formed from the roots käyttö (use) and päivä (day), and the form käyttöpäivänä represents the essive case, used to indicate a temporal state or time reference.

Use and meaning

In Finnish, käyttöpäivä and its inflected form käyttöpäivänä are commonly employed in technical, regulatory, and labeling contexts. They specify the time related to when something should be used or is valid, such as medications, chemicals, or other perishable items. The phrase emphasizes the designated day for use rather than a broader period.

Contexts and examples

Käyttöpäivänä is more frequent in written instructions, product labels, safety data sheets, and official guidelines than in everyday speech. It often appears alongside dates or time references, for example on packaging or in manuals that state the day by which a product should be used or opened.

Distinction from related terms

Käyttöpäivä refers to the day of use in a general sense, while käytetyn hetken or käyttöpäivämäärä (use-by date) denotes a deadline for use or expiration in practical terms. The essive form käyttöpäivänä focuses on the day itself as a temporal reference rather than a range.

See also

käyttöpäivämäärä (use-by date), käyttöohje (instructions for use), parasta ennen (best before), päivä (day), essiivi (Finnish grammatical case).