Kotlin program to add two dates

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In this program, you will learn how to add two dates using Calendar in Kotlin.

Since the Java epoch is1970 years, which means, your date will be1970 years, when adding two date objects, the total will lose about1970 years. So, we use Calendar instead.

Example: Adding two dates

import　java.util.Calendar
fun　main(args:　Array<String>)　{
　　　　val　c1　=　Calendar.getInstance()
　　　　val　c2　=　Calendar.getInstance()
　　　　val　cTotal　=　c1.clone()　as　Calendar
　　　　cTotal.add(Calendar.YEAR,　c2.get(Calendar.YEAR))
　　　　cTotal.add(Calendar.MONTH,　c2.get(Calendar.MONTH)　+　1)　//　Zero-based　months
　　　　cTotal.add(Calendar.DATE,　c2.get(Calendar.DATE))
　　　　cTotal.add(Calendar.HOUR_OF_DAY,　c2.get(Calendar.HOUR_OF_DAY))
　　　　cTotal.add(Calendar.MINUTE,　c2.get(Calendar.MINUTE))
　　　　cTotal.add(Calendar.SECOND,　c2.get(Calendar.SECOND))
　　　　cTotal.add(Calendar.MILLISECOND,　c2.get(Calendar.MILLISECOND))
　　　　println("${c1.time}　+　${c2.time} = ${cTotal.time})
}

When you run this program, the output is:

Tue Aug 08　10:20:56　NPT　2017　+　Tue Aug 08　10:20:56　NPT　2017　= Mon Apr　16　20:41:53　NPT　4035

In the above program, c1and c2Store the current date. Then, we just need to clone c1and add c2of each DateTime property.

As you can see, we have added a month. This is because, in Kotlin, the month starts from 0.

Or, you can also use Joda for time in Kotlin/Date Operations.

The following is the equivalent Java code:Java Program to Add Two Dates.

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