Test your system's time synchronization with our NTP reference server for free.
Real-time comparison
Analyzing...
⏰ Your Machine
Client local time
--:--:--.---
Timezone: --
🌐 RDEM Server
Server time (reference)
--:--:--.---
UTC+1 (Europe/Paris)
✓
Excellent synchronization
Offset: 0ms
Technical Details
Measured offset:-- ms
Estimated network latency:-- ms
Server timestamp:--
Client timestamp:--
User Agent:--
How does it work?
This page queries our NTP server every 10 seconds to measure the offset between your machine and our Stratum 1 reference.
A significant offset may indicate an NTP synchronization issue on your machine.
To validate a specific NTP server, use online-ntp-validator.com.
🖥️ Command Line Check (CLI)
For system administrators: test without a browser using our automatic bash script