Do these QR codes expire?

No. They are static codes: the content is stored in the pattern itself, with no redirect through our servers, no tracking and no expiry. They work for as long as the content stays valid.

Which time zone is used?

The time is stored as local time, so it appears at the same clock time on the phone that scans it.

Calendar Event QR Code Generator - Free Online Tool

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Create a QR code that adds an event to a phone calendar.