Swedish time prepositions: i, på, om
The difference between i en vecka and om en vecka, why på fredag points forward and i fredags points back, and the i words every beginner needs.
Three small words carry most Swedish time expressions: i, på, and om. None of them maps neatly onto one English preposition, which is why "see you in a week" so often comes out wrong. The system underneath is small; this article lays it out contrast by contrast.
The contrast that matters most: i versus om
- i en vecka = for a week (a duration)
- om en vecka = in a week (time until something happens)
English "in a week" pulls learners toward i en vecka, but that phrase answers "how long?", not "when?". If you say Jag är i Spanien i en vecka, you're in Spain for a week. If the trip starts later, it starts om en vecka, a week from now.
- Bussen kommer om fem minuter. The bus comes in five minutes.
- Jag är i Stockholm i tre dagar. I'm in Stockholm for three days.
If you take one thing from this page, take that pair. (Om has other jobs in Swedish, including "if" and "about". With a time expression after it, it means "in".)
Forward with på, backward with i ... s
Weekdays point in two directions, and Swedish marks the direction:
- på måndag = on Monday, the coming one: Vi ses på måndag.
- i måndags = last Monday, the one just passed.
That little -s plus the switch from på to i does the work English does with "next" and "last". You don't need to produce the past version on day one, but you'll hear it constantly, so learn to recognise it: i fredags, last Friday.
The i words you learn as vocabulary
A cluster of everyday time expressions is built on i. Don't analyse them, just absorb them as words:
- i dag = today
- i går = yesterday
- i morgon = tomorrow
- i kväll = tonight, this evening
- i sommar = this (coming) summer
You'll see some of them written as single words too (idag, imorgon); both spellings are correct, and this platform writes them apart.
For things that happen in a season generally, habitually, Swedish switches to på plus the definite form: på sommaren, in the summer; på vintern, in the winter. Compare: i sommar is about this particular summer ahead; på sommaren is about summers in general.
Clock times need no preposition at all
Where English says "at seven", Swedish just says klockan sju:
- Vi börjar klockan åtta. We start at eight.
No i, no på. In casual speech even klockan often drops: Vi ses sju.
Hear the system
Five sentences, one per rule you've just read.
Swedish
Bussen kommer om fem minuter.
Jag är i Stockholm i tre dagar.
Vi ses på fredag.
I morgon åker vi till Malmö.
I kväll dricker vi te hemma.
English
The bus comes in five minutes.
I'm in Stockholm for three days.
See you on Friday.
Tomorrow we're going to Malmö.
Tonight we're drinking tea at home.