The other day my student said "See you in Tues". Maybe you know it should be "See you on Tues". I realized it's not that strange that he got it confused since we often use "in" for times. Let's see when we use "in" or "on" (or others).

When do we use "in"? For names of months, years, an amount of time...

I met you:

• in July
• in 2019

I'll see you:

• in a month
• in a few minutes
• in 3 weeks
• in a year