Saying when something happens involves two separate problems, and it helps to keep them apart. The first is which little word to use — am Montag, im Januar, um sieben. The second is where the time expression goes, and what happens to the rest of the sentence when you move it. The second one is where nearly all the mistakes are.
am, im, um — and none at all
German picks the preposition by the size of the time unit. Clock times take um, days and parts of days take am, months and seasons take im — and a surprising number of very common time words take no preposition whatsoever.
| Use | For | Examples |
|---|---|---|
| um | clock times | um sieben Uhr, um halb acht, um Mitternacht |
| am | days and parts of the day | am Montag, am Morgen, am Abend, am Wochenende, am Samstagmorgen |
| im | months, seasons, years | im Januar, im Sommer, im Jahr 2020 |
| (nothing) | heute, morgen, gestern and friends | heute, morgen früh, gestern Abend, vorgestern |
| (nothing, + accusative) | repeated or measured stretches | jeden Tag, letzte Woche, nächsten Monat, diesen Sommer |
| -s ending | habitual — “on Mondays” | montags, abends, sonntagvormittags |
Tipp · Two things to watch. “In der Nacht” breaks the am pattern — it is the one part of the day that takes in, and “am Nacht” is wrong. And the no-preposition row is genuinely accusative, which is why it is “jeden Tag” and “nächsten Monat” rather than jeder and nächster.
The rule that trips everyone up
German lets you start a sentence with the time expression, and it is very common to do so. But the conjugated verb has to stay in second position no matter what sits in first — so when the time moves to the front, the subject gets pushed behind the verb. That swap is not optional and it is not stylistic.
Ich stehe am Morgen um sieben Uhr auf.
I get up at seven in the morning.
subject first — ordinary order
Am Morgen stehe ich um sieben Uhr auf.
(the same)
time first, so the verb comes before the subject: stehe ich, not ich stehe
Um elf hat sie alle Pflanzen gegossen.
At eleven she watered all the plants.
same rule in the Perfekt — hat is the conjugated verb, so hat sits second
Counting the positions helps: “Am Morgen” is one unit and takes position one, however many words it contains. Position two belongs to the verb, always. Then comes the subject, and the sentence carries on as usual.
When it is not at the front: time before place
If you leave the time expression in the middle of the sentence, it goes after the verb and — this is the part English speakers get backwards — before any expression of place. English says “I'm going to Berlin tomorrow”; German puts the time first.
Ich fahre morgen nach Berlin.
I'm going to Berlin tomorrow.
time (morgen) before place (nach Berlin)
Wir treffen uns um acht am Bahnhof.
We're meeting at the station at eight.
again: when first, where second
Am Montag um acht beginnt der Kurs.
The course starts on Monday at eight.
two time expressions: the general one before the more precise one
Separable verbs and the Perfekt: what goes at the very end
Time expressions sit in the middle of the sentence, and the pieces that belong at the end still go to the end. A separable prefix and a past participle are not affected by the time expression at all — they jump over it.
Am Morgen stehe ich um sieben Uhr auf.
I get up at seven in the morning.
the prefix auf goes last, after both time expressions
Der Zug fährt um Viertel nach drei ab.
The train leaves at a quarter past three.
ab last, not “fährt ab um …”
Am Samstagmorgen bin ich joggen gegangen.
On Saturday morning I went jogging.
time first, bin second, and the participle still closes the sentence
Common mistakes
✗Am Morgen ich stehe um sieben auf.
✓Am Morgen stehe ich um sieben auf.
The single most common error at A2. Something in first position pushes the subject behind the verb — the verb's second place is not negotiable.
✗Ich fahre nach Berlin morgen.
✓Ich fahre morgen nach Berlin.
German is time-before-place, the opposite of the English habit. Time answers wann, place answers wohin, and wann comes first.
✗Ich stehe auf um sieben Uhr.
✓Ich stehe um sieben Uhr auf.
The separable prefix belongs at the end of the clause, so the time expression goes in front of it, not after.
✗Am Januar fahre ich weg.
✓Im Januar fahre ich weg.
Months take im. am is for days and parts of the day — am Montag, am Abend.
✗Ich gehe jeder Tag ins Büro.
✓Ich gehe jeden Tag ins Büro.
These no-preposition time expressions are accusative, so it is jeden Tag, letzte Woche, nächsten Monat.
✗Am Nacht schlafe ich schlecht.
✓In der Nacht schlafe ich schlecht.
Nacht is the exception to the am rule for parts of the day. Learn “in der Nacht” as a fixed phrase.
One reassurance to finish on. Starting a sentence with the time is not a special construction you have to earn — it is ordinary German, and it is often the more natural choice when you are telling someone about your day or your weekend. Once the verb-second swap is automatic, it stops being a rule you apply and becomes the way the sentence wants to come out.