In Friday or On Friday
Use "on Friday" for specific days. For example, "We have a meeting on Friday." This is standard in modern English for dates and days of the week.
When to Use "In Friday"
Use "in Friday" only when Friday is part of a larger period, such as "in Friday's session" or "in the Friday edition." Avoid "in Friday" for standalone days.
Quick Reference and Examples
Correct: "The report is due on Friday." Correct: "She joined the team in Friday's workshop." For more on prepositions of time, see the Cambridge Dictionary guide on prepositions.
Stick to "on Friday" for single days. Reserve "in Friday" for phrases where Friday modifies a noun or event within a broader timeframe.
