以…为准【yǐ … wéi zhǔn】

以 X 为准 says X is the version that counts when two sources disagree. It belongs to notices, contracts, timetables and price tags. 为 is read wéi here.

The thing being settled usually comes first as a topic, and X is a noun phrase naming a document, a measurement or an authority: 通知, 合同, 官网, 实际情况, 中文版本.

请 and 一律 in front

A notice that tells the reader where to check puts 请 before 以. 一律 or 均 says the rule has no exceptions.

Mistakes

为准 is fixed. Learners swap in 是 or drop 以, or put the noun after 为准 as if it were a verb.

• × 时间以通知是准 → 时间以通知为准
• × 时间为准通知 → 时间以通知为准

以…为主 and 以…为例 use the same frame with a different second word; they mean "mainly X" and "taking X as an example".