About
About breach72
A free, open calculator that turns one timestamp into your GDPR Article 33 notification deadline.
The GDPR gives controllers 72 hours from becoming aware of a personal data breach to notify the supervisory authority. The clock starts at "awareness" (not occurrence), runs in continuous calendar hours, and where it ends on a non-working day may be extended under Regulation 1182/71. breach72 computes this for your specific moment of awareness.
It shows the strict 72-hour deadline with a live countdown, flags the weekend / public-holiday extension, and reminds you of the separate Article 34 duty to tell affected individuals when the risk is high. It is a static page, so the timestamp stays in your browser. Informational only — not legal advice, and not affiliated with any supervisory authority or the EU.