Time Calibration QR Generator
Generate a signed system-time QR code for devices to scan and calibrate their clock. It auto-refreshes every second to stay accurate.
Scan with the device to calibrate the system time
The signing key must match the device side; everything is computed locally in your browser and nothing is uploaded.
Current system time
2026-10-13 15:54:27
QR code auto-refreshes every second
Generated payload
The payload consists of a protocol header + system time + HMAC-MD5 signature:
___VBAR_CONFIG_V1.1.0___{systemtime='2026-10-13 15:54:27'}--kyuCsKqy6pdvPvevKYTYxQ==How to use
- 1Open this tool and confirm the signing password matches the device side
- 2Scan the QR code on the right with the device
- 3After signature verification, the device calibrates its clock to the encoded time
Notes
The signature is generated with HMAC-MD5 (Base64) and verified on the device with the same key; the page runs fully in your browser and uploads no data.