Updating clock on the minute exactly

Posted on Mon 4th, April 2022

• #1

Sir_Indy

Hi,

I've only written one clock so far (and editing another), but it was fun! I had a a question about the best way to update the clock face:

On the pebble, there was a function rocky.on('minutechange', function(event) { that would fire every minute, on the minute. Is there a similar function for the bangle?
I know I can set a timer to go off every sixty seconds, but is there a way to start at 0 seconds past the minute? Or on exactly 0 seconds and 30 seconds past?

Thank you.
• #2

Alessandro in reply to @Sir_Indy

I know I can set a timer to go off every sixty seconds, but is there a way to start at 0 seconds past the minute? Or on exactly 0 seconds and 30 seconds past?

Clocks usually use the setTimeout method like this: https://github.com/espruino/BangleApps/blob/c4f9d7757912442df66b21038322ee65acf53b53/apps/waveclk/app.js#L21-L24

The 60000 - (Date.now() % 60000) part returns the millis to the next minute.
• #3

Sir_Indy in reply to @Alessandro

Ah, thank you Alessandro, I hadn't seen that before but it's exactly what I need!
• #4

Numerist

If your watch gains or loses time noticeably, I suggest installing the widget Adjust Clock by @malaire, which enables accurate timekeeping. Use of that would change Alessandro's statement slightly.

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