Format, the B1 rule, and each part are on the DTZ B1 page.
Quick Answer
The DTZ runs every two weeks. You register in person at the licensed Prüfstelle (test centre) where you will sit, up to 21 days before the exam date; the official FAQ also describes this as about three weeks. g.a.s.t. builds personalised answer sheets from that registration, so your first name, family name, date of birth, exam location, and exam date must match your identity document — those fields are printed on the certificate. For the national schedule, use the official Terminkarte images linked from the g.a.s.t. DTZ overview, not a copied table here.
The expensive mistake is treating “national DTZ” like a single web checkout. Dates, room capacity, and the exact registration steps live with the Prüfstelle. Ask that centre which session still has seats and what ID and spelling they expect before they lock your personalised sheet.
Sessions sit on the official Terminkarte
g.a.s.t. publishes the rolling two-week rhythm and the downloadable Terminkarten. Open those cards, pick a week you can travel, then confirm the seat with the centre.
In-person registration and identity match
Registration is not described as a generic online-only flow. You work with the Prüfstelle; g.a.s.t. uses the data to print answer sheets and certificates. Typos on the form propagate to documents — fix spelling before exam day.
Choosing a licensed centre
See DTZ exam centres for what “Prüfstelle” means and how to stay on official lists. BAMF’s Navi tool is linked from the g.a.s.t. overview; it helps locate authorised course providers that run the exam — it is not a replacement for the centre’s own registration message.
After you have a date in mind
Walk the timed layout once on the DTZ B1 mock test landing so the two-week cadence does not feel abstract — Hören, Lesen, Schreiben, then paired Sprechen still behave like one sitting even if your brain wants to rehearse skills separately.