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@lauzon
Thanks. I am tweaking alarm.app.js to have dated events, and I had a similar problem (which occurs depending on the time of the day + if you are in a negative or positive time zone) when I had to save the alarm date. I didn't notice we had access to toLocalIsoString, so at first I used the following instead (which we could use in the scheduler if we prefer to stay backward compatible):
new Date(date - (date.getTimezoneOffset() * 60000)).toISOString().slice(0,10)
As you proposed, I'll document a failing example in the scheduler before proposing an official fix.