If a date is before another date

       

import java.util.Calendar;
import java.util.Date;

public class Main {
  public static void main(String[] args) {
    Date today = new Date();

    Calendar calendar = Calendar.getInstance();
    calendar.add(Calendar.DATE, -1);
    Date yesterday = calendar.getTime();

    if (yesterday.before(today)) {
      System.out.println(yesterday + " is before " + today);
    }
  }
}

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If a date is before another date : Calendar Date « Development Class « Java

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