Use på with a day (på måndag), i with a month (i maj), and klockan with a clock time (klockan åtta). Days and months are written in lower case.
Examples
- På onsdag har jag lektion.
- On Wednesday I have a class.
- I april åker jag till Wien.
- In April I'm going to Vienna.
- Vi ses klockan åtta.
- We're meeting at eight o'clock.
The mistake to avoid
Klockan introduces a time; på introduces a day.
Where this fits in
Numbers, days, time, Swedish A1: Count, talk about days and months, give the time, and handle numbers in real situations.