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Configuração do relógio do sistema

Guia de configuração NTP

Time.ms can show your device clock offset in the browser. To make your computer itself keep accurate time, configure your operating system to use a reliable NTP server.

Servidor recomendado

Você pode usar time.cloudflare.com como servidor NTP público simples e confiável.

Referência oficial: Cloudflare Time Services NTP usage.

Windows 11

  1. Open Settings, then go to Time & language.
  2. Open Date & time and keep Set time automatically enabled.
  3. If available, set the internet time server to time.cloudflare.com.
  4. Click Sync now, then revisit Clock Drift Test to verify the offset.

PowerShell check

w32tm /query /status

macOS

  1. Open System Settings, then Date & Time.
  2. Enable automatic date and time.
  3. Use time.cloudflare.com if macOS allows a custom network time server.
  4. Run the browser drift test again after sync succeeds.

Terminal check

systemsetup -getusingnetworktime

Linux Servers

Most modern distributions use systemd-timesyncd, chrony, or ntpd. Configure the active time service to use:

Server value

time.cloudflare.com

After changing the configuration, restart the time service and check its sync status with your distribution standard tooling.

systemd-timesyncd

timedatectl status

chrony

chronyc tracking

Routers and Network Devices

Many routers, NAS devices, firewalls, cameras, and appliances include an NTP server field. Set the server to time.cloudflare.com and keep automatic synchronization enabled.

  • Use NTP or SNTP mode if both manual time and network time are offered.
  • Keep timezone settings separate from the NTP server setting.
  • After saving, wait for the next sync interval before checking the offset again.

Verificar depois

After your system syncs, open Clock Drift Test. A small offset and low network delay indicate your local clock is aligned well enough for most workflows.

Check offset

Run Clock Drift Test before and after changing settings so you can compare the result.

Check service state

Confirm the operating system reports network time as enabled and synchronized.

Wait for resync

Some systems sync on an interval, so the offset may improve a few minutes after setup.

Solução de problemas

Offset stays above one second
Check automatic time, service state, and whether UDP port 123 is blocked.
Timezone looks wrong but offset is small
NTP synchronizes absolute time. Change your operating system timezone separately.
Virtual machines keep drifting
Check both guest time service and host integration settings.

Related Time Tools

Verify NTP changes with clock drift testing, then use the timestamp and UTC tools for logs, APIs, and troubleshooting.

Hora exata atual

Hora atômica com milissegundos, UTC, Unix, atraso e desvio.

Timestamp Unix

Converta epoch segundos/milissegundos para local, UTC e ISO 8601.

Teste de desvio

Compare seu relógio com a hora calibrada e copie um relatório.

Hora UTC

Veja UTC com milissegundos e converta hora local para UTC.

ISO 8601

Crie e analise timestamps ISO para logs, APIs e bancos de dados.

Guia de precisão

Entenda RTT, precisão estimada, desvio e privacidade.

FAQ de NTP

What is NTP?

NTP stands for Network Time Protocol. It is the standard protocol computers use to keep clocks synchronized over a network.

Which NTP server should I use?

A reliable public option is time.cloudflare.com. Many operating systems also include vendor time servers by default.

Why does accurate system time matter?

Accurate system time helps authentication, HTTPS certificates, logs, scheduled jobs, backups, and distributed systems work correctly.