
mittwochs
on Wednesdays
Expresses that something regularly takes place every Wednesday or happens on a Wednesday.
Mittwochs gehe ich immer zum Yoga.
On Wednesdays I always go to yoga.
on Wednesdays
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on Wednesdays
Expresses that something regularly takes place every Wednesday or happens on a Wednesday.
Mittwochs gehe ich immer zum Yoga.
On Wednesdays I always go to yoga.
The adverb 'mittwochs' (on Wednesdays) is formed from the noun 'der Mittwoch' (Wednesday) by adding an '-s'. This '-s' at the end of time expressions always signals regular repetition.
Der Supermarkt hat mittwochs länger geöffnet.
The supermarket is open longer on Wednesdays.
Although it is derived from the noun 'der Mittwoch' (Wednesday), 'mittwochs' (on Wednesdays) is an adverb and is therefore always written in lowercase.
Wir treffen uns immer mittwochs zum Abendessen.
We always meet for dinner on Wednesdays.
As an adverb, 'mittwochs' (on Wednesdays) can stand in position 1; then the verb follows immediately. But it can also stand in the middle of the sentence after the verb and the subject.
Mittwochs hat mein Lieblingscafé geschlossen.
On Wednesdays my favorite café is closed.
Wednesday
Mittwoch is the name of a day of the week and usually refers to a specific Wednesday, often in a form such as am Mittwoch. mittwochs is used directly as a time expression and normally indicates that something happens regularly on that day of the week.

Der Sprachkurs findet jede Woche mittwochs statt.
The language course takes place every week on Wednesdays.
Der Sprachkurs findet diese Woche am Mittwoch statt.
The language course is taking place this week on Wednesday.