Public Time Server • Now Global

smoothtime

Time without the twice-yearly trauma.
We spread the 1-hour jump smoothly across the entire season — now with Australia, New Zealand, Chile & Argentina.

Europe Central Smoothtime (CET/CEST)
00:00:00
Active UTC Adjustment
+1.000 h

Interactive Demo DST Transition Simulator

See what the current local time would be vs smoothtime at any point in the season. Both clocks tick live.

90 / 180
Start
Mid
End
schedule
Official Time
Current local time (real)
--:--:--
+2.000 h (CEST)
timeline
smoothtime
What this server would show
--:--:--
+1.500 h
On this simulated day, your clock would be
-30 minutes
behind official time
Both clocks tick live every second.

01. Why this matters

The Problem with Jumping Time

Nature does not execute sudden jumps. In the field of chronobiology, researchers have shown that the human body naturally synchronizes its internal circadian rhythm to the gradual, daily shift of the sunrise.

Twice a year, however, we force a jarring 60-minute time shift on ourselves. This abrupt transition severs the alignment between our biological "sun clock" and our "social clock," causing what scientists call Social Jetlag. This artificial shift is linked to acute sleep loss, increased cardiovascular events, and massive disruptions to digital infrastructure.

smoothtime.io solves this by mimicking nature's gradual "astro-shift" on your network. By spreading the transition across the entire season—adjusting just a fraction of a second each day—your devices stay perfectly aligned with Daylight Saving Time without ever experiencing the shock of a sudden jump.

The Science of Social Jetlag

psychology

Zero Disruptions

No missed morning alarms. No confusing overlapping calendar events.

02. How it Works

timeline

Gentle Adjustments

Instead of waiting months to move your clock by a full hour, our open-source time servers gradually shift the time throughout the year. It works just like a physical clock moving very slightly faster or slower, entirely unnoticed by users.

MATHEMATICAL_DRIFT
devices

Compatible with Everything

It works out-of-the-box with any standard device that connects to the internet to check the time. No special software needed. Now supports Southern Hemisphere timezones too.

03. Setup for your Devices

warning

CRITICAL SETUP STEP: You MUST set your system timezone to UTC

Standard time servers transmit pure UTC, and your computer adds your local timezone on top. Smoothtime works differently. We bake your timezone and our custom daylight saving "smear" directly into the time we send you. If you leave your computer set to your local timezone, it will apply the timezone difference twice, resulting in a massively incorrect clock.

terminal For Linux & Servers

  1. Set your system to pure UTC:
    sudo timedatectl set-timezone UTC
  2. Add the smoothtime server address (shown right) to your ntp.conf.
  3. Restart your NTP service to apply the change immediately.

laptop_mac For macOS

  1. Open System Settings > General > Date & Time.
  2. Turn off Set time zone automatically.
  3. In the "Closest City" field, select UTC or GMT.
  4. Update your Time Server address to your regional smoothtime node.

desktop_windows For Windows

  1. Open Settings > Time & language > Date & time.
  2. Turn off Set time zone automatically.
  3. Change the Time zone dropdown to (UTC) Coordinated Universal Time.
  4. Click Sync now after configuring your new server address.
Server Address 
# Your regional smoothtime server:
europe-central.smoothtime.io

# Example Linux (ntp.conf) integration:
server europe-central.smoothtime.io iburst
pool pool.ntp.org iburst