Hello. I'm trying to use `datetime` library for the following scenario. Can you please help me with ...

# kotlinx-datetime

[Vitali Plagov]

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?

[louiscad]

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

[Vitali Plagov]

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

[Vitali Plagov]

I don't mind creating a new object, not modifying the existing one. I just want to avoid repeating Clock.System.... chain several times because the diff in above two chains is minus() and plus() functions

[molikuner]

You could use let:

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

[Vitali Plagov]

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