Latence réseau
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Diagnostic de l’heure appareil
Test de dérive de l’horloge
Compare your device clock with network-calibrated atomic time. Use the offset, delay, and accuracy estimate to decide whether your computer needs a time sync check.
Décalage de l’horloge
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Calibration○ Synchronisation
Measuring network delay and comparing your device clock with calibrated time.
Précision estimée
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Dernière synchro
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What It Means
Positive offset means calibrated time is ahead of your device clock. Negative offset means your device clock is ahead.
Comparaison en direct
- Heure appareil
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- Heure atomique
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Rapport de diagnostic
Copy this report when troubleshooting login, certificate, logging, or distributed-system time issues.
Rapport de dérive Time.ms
Under 100 ms
Usually excellent for browser, logging, and most user-facing workflows.
Over 1 second
Worth checking automatic time sync, VPN behavior, VM host time, or system time settings.
Over 1 minute
Can break authentication, certificates, scheduled jobs, and audit trails.
Related Time Tools
After checking drift, convert timestamps, inspect UTC, or use the NTP setup guide to correct system time.
Heure exacte actuelle
Heure atomique avec millisecondes, UTC, Unix, latence et décalage appareil.
Horodatage Unix
Convertissez epoch secondes/millisecondes vers local, UTC et ISO 8601.
Heure UTC
Consultez UTC avec millisecondes et convertissez l’heure locale en UTC.
ISO 8601
Créez et analysez des horodatages ISO pour logs, API et bases de données.
Configuration NTP
Configurez un ordinateur ou serveur pour garder l’heure synchronisée.
Guide de précision
Comprenez RTT, précision estimée, décalage et confidentialité.
FAQ dérive
What is clock drift?
Clock drift is the difference between your device clock and a more reliable time reference.
What offset is acceptable?
A few hundred milliseconds is usually fine for browsing, while authentication and distributed systems often need tighter alignment.
How does this test estimate accuracy?
Time.ms measures network round-trip delay and uses half that delay plus a small browser timing allowance.