Time & Calculators

Watch Clock Check

Set and track mechanical watches with local profiles, offset logs, and automatic server-time calibration you can disable.

watchclockoffline

Browser-first/Automatic time checks/Offline watch logs

Reference clock

Intended for setting mechanical watches, not certified timing

Device-onlyOnline

Loading local clock...

Using this device's clock

Local timezone: loading...

Calibration age

No calibration

Age rating

Device-only

Uncertainty

Device clock only

Within a few seconds is fine for most mechanical watches.

Device clock calibration

Compared against rbits hub server time when online.

Thorough · 15 samples

Automatic calibration paused

Every calibration uses the five lowest-latency samples to reduce network timing noise.

When enabled, runs when calibration is missing or older than 24 hours, while this page is online, visible, and outside guided set mode.

No watch profiles, notes, or logs are sent.

Automatic calibration is paused until local storage is available and compatible.

Automatically calibrate

Guided set mode

Use the best available reference time to set the watch cleanly.

Device-only

Loading local clock...

Next :00 in --:--

Using this device's clock

Hacking seconds

Pull the crown when the seconds hand reaches 12, advance the minute hand to the next target minute, wait for the app to hit :00, then push the crown in exactly at :00.

Watch profiles

Profiles, tolerances, and watch-specific details stay local.

Add a watch to start tracking offsets and resting positions.

Watch name

Brand

Model

Movement

Target sec/day

Power reserve hours

Hacking secondsHas date

Notes

Offset logs

Positive offset means the watch is fast versus the active reference.

Add or select a watch before logging offsets.

Direction

Offset seconds

Position

Power state

Notes

Watch is exact versus reference.

Device-only

No offset logs yet.

Position tracking

Position effects are approximate and improve as you add logs.

Not enough data yet to recommend a resting position.

Settings

Stored locally in this browser.

Time format

Calibration freshness hours

Uncertainty warning ms

Default target sec/day

Show millisecondsShow UTCShow local timezone4-tick cue and :00 bellVibration at next minuteCountdown to next minuteKeep screen awake

Power reserve helper

Add power reserve hours to the active watch to estimate remaining reserve.

Import JSON