Hello. I'm trying to use

datetime

library for the following scenario. Can you please help me with it? I need an object with date of now with time at 10:00. Next, I need to change this object by adding one day or by subtracting one day (depending on a certain condition). So, I made the first part:

var todayAtTen = Clock.System.todayAt(TimeZone.UTC).atTime(hour = 10, minute = 0)

but can't make a second. How can I modify this object by adding one day to it?

Why modify the object? Just create a new one with the time difference you need. Immutability is safer.

Yes, I know I can do smth like this:

Clock.System.todayAt(TimeZone.UTC).plus(...).atTime(hour = 10, minute = 0)

and

Clock.System.todayAt(TimeZone.UTC).minus(...).atTime(hour = 10, minute = 0)

But I will have to repeat the same commands twice

You could use let:

Clock.System.todayAt(TimeZone.UTC).let {
  if (condition) {
    it.plus(...)
  } else {
    it.minus(...)
  }
}.atTime(hour = 10, minute = 0)

Hm, this looks interesting. I will check. Thanks for suggestion @molikuner