Q:

Scala program to subtract days from the current date

belongs to collection: Scala Date & Time Programs

YasminRadwan26
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2022-07-08
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Here, we will read the number of days from the user. Then we will create a date object and subtract the input number of days to created date object. After that, we will print the updated date on the console screen.

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YasminRadwan26
2022-07-08
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Program/Source Code:

The source code to subtract days from the current date is given below. The given program is compiled and executed on the ubuntu 18.04 operating system successfully.

// Scala program to subtract days from current date

import java.util.Date;

object Sample {
  def main(args: Array[String]) {
    var MILLIS_IN_A_DAY = 1000 * 60 * 60 * 24;
    var date = new Date();
    var days: Int = 0;

    print("Enter number of days: ");
    days = scala.io.StdIn.readInt();

    var newDate = new Date(date.getTime() - (MILLIS_IN_A_DAY * days));

    println("Current date: \n" + date);
    println("New date: \n" + newDate);
  }
}

Output:

Enter number of days: 10
Current date: 
Mon May 31 02:33:37 GMT 2021
New date: 
Fri May 21 02:33:37 GMT 2021

Explanation:

Here, we used an object-oriented approach to create the program. And, we imported the Date class using the below statement,

import java.util.Date;

Then we created a singleton object Sample and defined the main() function. The main() function is the entry point for the program.

In the main() function, we created a variable MILLIS_IN_A_DAY, which contains milliseconds in a day. Then we created an object date of the Date class and read the number of days from the user.

After that, we subtracted days from the date object and created a new object that contains an updated date using the below statement.

var newDate = new Date(date.getTime()-(MILLIS_IN_A_DAY*days));

At last, we printed both objects on the console screen.

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