On Friday or in Friday: which is correct?
先写下记得的内容，再查看解释。不要填写个人信息。
查看解释
On connects an event to a specific day or calendar date. It answers the question about which day something happens. In refers to an enclosed space, a document, or a longer stretch of time like a month or a season. When Friday names the day an action takes place, on is the only standard choice. Saying in Friday does not match English grammar.
I will collect my bike on Friday.