Дата окончания срока действия зависит от даты выдачи.

to depend

Breakdown of Дата окончания срока действия зависит от даты выдачи.

• от: on
• дата выдачи: the date of issue
• дата окончания срока действия: the expiry date

Questions & Answers about Дата окончания срока действия зависит от даты выдачи.

Why are there so many nouns in a row: дата окончания срока действия?

This is a very common Russian pattern: a main noun followed by one or more nouns in the genitive case to narrow the meaning.

Here, the structure is:

• дата = date
• окончания = of ending / of expiration
• срока действия = of the period of validity

So literally, it is something like:

• date of the ending of the validity period

In more natural English, that becomes expiration date or end date of validity.

Russian often builds these long noun chains where English might prefer a shorter compound like expiration date.

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What case is окончания in, and why?

Окончания is in the genitive singular.

Its dictionary form is окончание. After дата, Russian often uses the genitive to mean date of something:

• дата рождения = date of birth
• дата выдачи = date of issue
• дата окончания = date of expiration / end date

So окончания answers the question date of what? That is why it is genitive.

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Why is it срока действия, not just срок?