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시스템 시계 설정

NTP 설정 가이드

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.

권장 서버

간단하고 신뢰할 수 있는 공개 NTP 서버로 time.cloudflare.com을 사용할 수 있습니다.

공식 참고: 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.

설정 후 확인

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.

문제 해결

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.

정확한 현재 시간

밀리초, UTC, Unix 시간, 네트워크 지연, 장치 오프셋을 표시합니다.

Unix 타임스탬프

epoch 초/밀리초를 로컬 시간, UTC, ISO 8601로 변환합니다.

시계 오차 테스트

장치 시계를 보정 시간과 비교하고 진단 보고서를 복사합니다.

UTC 시간

밀리초 단위 UTC를 확인하고 로컬 시간을 UTC로 변환합니다.

ISO 8601

로그, API, DB용 ISO 타임스탬프를 생성하고 파싱합니다.

정확도 가이드

RTT, 예상 정확도, 장치 오프셋, 폴백 동작과 개인정보 경계를 설명합니다.

NTP FAQ

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.