Linux Command - clockdiff

The clockdiff command in Linux measures the time difference between the local machine and a remote host using ICMP Timestamp Requests (RFC 792). It’s useful for roughly checking clock skew between two systems without needing NTP.

• IPv4 only, not on IPv6
• Needs root permissions

sudo clockdiff 192.168.1.1

Install on Ubuntu/Debian/Mint:

sudo apt install iputils-clockdiff