how to get one month from now in Calendar data type?

Question

I want to set maximum date in my date picker dialog like this

as you can see, it requires Calendar data type for the input.

I want the max date is always one month from current time. I have tried like this

        val now = Calendar.getInstance()
        val currentYear: Int = now.get(Calendar.YEAR)
        val currentMonth: Int = now.get(Calendar.MONTH)
        val currentDay: Int = now.get(Calendar.DAY_OF_MONTH)

        val oneMonthFromNow = now.add(Calendar.MONTH,1)

but oneMonthFromNow type is in unit, not in Calendar data type. so how to dynamically add one month from current date time ?

java or kotlin is ok

Answer 1

First thing I would say to not use Calendar class, use instead LocalDateTime. You will get many articles about how to use this class and why to use.

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Even if you want to use Calendar class, then I would say if anything not working or not returning anything, you should look into that class implementation. There must be a way to solve your problem. This way will increase your knowledge as well as debugging skills.

So coming to your solution, you need to use like this

    val now = Calendar.getInstance()
    // val currentYear: Int = now.get(Calendar.YEAR)
    // val currentMonth: Int = now.get(Calendar.MONTH)
    // val currentDay: Int = now.get(Calendar.DAY_OF_MONTH)

    now.add(Calendar.MONTH,1) // Added one month 
    val oneMonthFromNow = now
    // Or 
    // val oneMonthFromNow = now.clone()
    // oneMonthFromNow.add(Calendar.MONTH,1)