[twenties] Fix TypeError on scheduling for the next day

[elfehr]

Twenties v0.06 introduced a bug that prevents it to set a timer for the next work day.
This error message appears in the IDE after the last buzz of the day:

Uncaught TypeError: Variables of type Object are not supported in date constructor
    at .boot0:52:38
            const next = new Date(now);

[thyttan]

Thanks! I presume this is tested and works well?

[elfehr]

Thank!
The error message is gone, but now I wonder if I haven't found another bug.
next is set to today 8am, which is included in work time, so the date is not incremented. With print statements in the IDE, I see that next - now is negative, setTimeout(scheduleNext, next - now) seems to timeout immediately, and the function is called constantly.

[thyttan]

Hm. Since I'm refactoring twenties to use the scheduling library anyways would you mind trying out that one instead: #4231

[elfehr]

Alright, having a look now.

Otherwise, Date(now+864e5) (now+24h) seems to fix it, and for some reason it doesn't trigger the same TypeError as Date(now) does.

[thyttan]

Feel free to open another PR if you want 🙂