The ⌂ button marks your home zone — every +/-H offset on the main screen is measured from it. You can also drag the clocks themselves to reorder: left/right in horizontal and grid layouts, up/down in vertical. The ↑↓ buttons here do the same thing.
An alarm fires on its own zone's clock — set 9:00 AM on your EST row
and it rings when it's 9 AM in New York, whatever time that is for you.
Repeat weekly rings on the weekdays you highlight.
One-off date rings once on a date you pick, then switches itself off.
Pick dates takes a list of specific dates.
Choose SPEAK TEXT as the sound and it will say whatever you type, over and
over, until you dismiss it. The app has to be open (minimised is fine)
for an alarm to fire.
Volume and voice apply to every alarm. Test plays whichever sound new alarms will use by default.
You've opened this as a local file, and Chrome never allows desktop notifications on file:// pages. Alarms still ring and show their banner. For real Windows toasts, open it with the WorldClockNext desktop shortcut, which serves it from localhost.
Auto follows your Windows light/dark setting and switches on its own. Every colour — panels, text, the LCD glow and the time-of-day tints — is re-derived for the mode you pick. Press T to cycle.
Auto picks whatever arrangement makes the digits biggest for the current window shape, so it re-flows as you resize. Press L to cycle.
Each clock can be tinted by its own local time of day, so you can tell at a glance whether it's the middle of someone's night. Turn tint digits off to keep every clock in one colour instead.