Time

Main menu key: t

Four sub-modes: Uptime, Clock, Countdown, Stopwatch; supports Pure display (hides tip / extra UI).

Screenshots

Uptime / Clock / Countdown / Stopwatch

Pure display

Shortcuts

Mode switch (Help summary)

Key	Action
u	Uptime
t	Clock
c	Countdown
s	Stopwatch
p	Pure display toggle
r	Sync time / reset (depends on mode)
BtnGO	Start / pause / resume
h	Help

Uptime

Key	Action
p	Pure
h	Help

Clock

Key	Action
r	NTP sync (needs WiFi)
p	Pure
h	Help

Countdown · SETUP

Key	Action
Arrow keys	Adjust h/m/s fields
0–9	Digit input
BtnGO	Start
p / h	Pure / Help

Countdown · running / paused

Key	Action
BtnGO	Pause / resume
r	Reset
p / h	Pure / Help

Stopwatch

Key	Action
BtnGO	Start / pause / resume
r	Reset
p / h	Pure / Help

Usage

1. Default mode comes from config time.default (e.g. up); time.pure can enable Pure by default.
2. Clock uses RTC; with network, r does NTP. Timezone is timezone in config (e.g. CST-8).
3. Pure works well as a desk clock / stopwatch.
4. Countdown / Stopwatch keep timing after leaving the Time App or switching sub-modes — see below.

Background running

Uptime and Clock only refresh while Time is foreground; Countdown and Stopwatch state lives in memory and is not cleared when switching sub-modes or returning to the main menu.

Countdown

Scenario	Behavior
Running, switch to Clock / Uptime, etc.	Keeps timing; returning to Countdown shows remaining time
Running, back to main menu or another App	Keeps timing; main loop pollCountdownBackground detects expiry
Expires while not on Countdown page	Auto-enters Time App Countdown end page
Expiry alarm	Beep-beep-pause loop, up to 30s; rings even off CD page (volume from sound.volume)
Stop alarm	On end page, x cancels and returns to setup; or r reset

While PAUSED, remaining ms are saved; resume recomputes end time from millis(). Leaving the App does not call leaveCountdownApp to stop — only expiry, reset, or cancel alarm ends it.

Stopwatch

Scenario	Behavior
Running, switch sub-mode / main menu	swRunning and elapsed stay; continues from millis()
Re-enter Stopwatch	Shows correct elapsed (including time away)
Foreground refresh	While running, ~30ms refresh, display to 1ms
Reset	Double-beep r clears

No global expiry popup for stopwatch; screen does not refresh while away, but time still advances.

Sub-mode switch

Within Time, u / t / c / s keep Countdown and Stopwatch running state (enterCountdownApp / enterStopwatchApp only redraw; they do not reset phase).

Pure mode

Pure hides header / bottom tip; Countdown end page still keeps the cancel hint. Background timing and alarm logic match non-Pure.