how to get current date and 7thday from current day in android? and I want to show the dates in below format given by the image

Question

In the given image first date is current date with month and day. and another date is 7th day from current date.

I tried with the below code::

 Calendar cal = Calendar.getInstance();
            cal.set(Calendar.DAY_OF_WEEK, cal.getFirstDayOfWeek());
            SimpleDateFormat sdf = new SimpleDateFormat("EEEE dd.MM.yyyy");

            for (int i = 0; i < 7; i++) {
                Log.i("dateTag", sdf.format(cal.getTime()));
                cal.add(Calendar.DAY_OF_WEEK, 1);
            }
        tvDate1=(TextView) findViewById(R.id.calender_view1);
        tvDate1.setText("" + DateFormat.format("dd/MM/yyyy", System.currentTimeMillis()));


tvDate2=(TextView) findViewById(R.id.calender_view2);
        tvDate2.setText("here want to print 7thday");

Pinnacle

Your code is highly inefficient. Instead of a loop which adds 1 day 7 times, you should add 7 days in a single step. – Encage

Answer 1

SimpleDateFormat dateFormat= new SimpleDateFormat("EEEE dd.MM.yyyy");
Calendar currentCal = Calendar.getInstance();
String currentdate=dateFormat.format(currentCal.getTime());
currentCal.add(Calendar.DATE, 7); 
String toDate=dateFormat.format(currentCal.getTime());

Connelly

how can i calculate if i have another date ? @Connelly – Swainson

@VishalPatoliyaツ use currentCal.setTime(Date obj). Pass your Date obj after creating calendar instance. – Connelly

Answer 2

You need strings for each day, and then use a switch on the DAY_OF_WEEK.

Septennial

Answer 3

Check This Java Class

import java.util.Calendar;
import java.util.TimeZone;

public class DateAndTimeArithmetic {

    public static void main(String args[]){

        //Java calendar in default timezone and default locale
        Calendar cal = Calendar.getInstance();
        cal.setTimeZone(TimeZone.getTimeZone("GMT"));

        System.out.println("current date: " + getDate(cal));


        //adding days into Date in Java
        cal.add(Calendar.DATE, 2);
        System.out.println("date after 2 days : " + getDate(cal));

        //subtracting days from Date in Java
        cal.add(Calendar.DATE, -2);
        System.out.println("date before 2 days : " + getDate(cal));


       //adding moths into Date
        cal.add(Calendar.MONTH, 5);
        System.out.println("date after 5 months : " + getDate(cal));

        //subtracting months from Date
        cal.add(Calendar.MONTH, -5);
        System.out.println("date before 5 months : " + getDate(cal));

        //adding year into Date
        cal.add(Calendar.YEAR, 5);
        System.out.println("date after 5 years : " + getDate(cal));

        //subtracting year from Date
        cal.add(Calendar.YEAR, -5);
        System.out.println("date before 5 years : " + getDate(cal));

        //date after 200 days from now, takes care of how many days are in month
        //for years calendar takes care of leap year as well
        cal.add(Calendar.DATE, 200);
        System.out.println("date after 200 days from today : " + getDate(cal));

        System.out.println("current time in GMT: " + getTime(cal));

        //adding hours into Date
        cal.add(Calendar.HOUR_OF_DAY, 3);
        System.out.println("Time after 3 hours : " + getTime(cal));

        //subtracting hours from Date time
        cal.add(Calendar.HOUR_OF_DAY, -3);
        System.out.println("Time before 3 hours : " + getTime(cal));

        //adding minutes into Date time
        cal.add(Calendar.MINUTE, 3);
        System.out.println("Time after 3 minutes : " + getTime(cal));

        //subtracting minutes from Date time
        cal.add(Calendar.HOUR_OF_DAY, -3);
        System.out.println("Time before 3 minuets : " + getTime(cal));

    }

    /**
     *
     * @return current Date from Calendar in dd/MM/yyyy format
     * adding 1 into month because Calendar month starts from zero
     */
    public static String getDate(Calendar cal){
        return "" + cal.get(Calendar.DATE) +"/" +
                (cal.get(Calendar.MONTH)+1) + "/" + cal.get(Calendar.YEAR);
    }

    /**
     *
     * @return current Date from Calendar in HH:mm:SS format
     *
     * adding 1 into month because Calendar month starts from zero
     */
    public static String getTime(Calendar cal){
        return "" + cal.get(Calendar.HOUR_OF_DAY) +":" +
                (cal.get(Calendar.MINUTE)) + ":" + cal.get(Calendar.SECOND);
    }

}

Output:
current date: 23/7/2012
date after 2 days : 25/7/2012
date before 2 days : 23/7/2012
date after 5 months : 23/12/2012
date before 5 months : 23/7/2012
date after 5 years : 23/7/2017
date before 5 years : 23/7/2012
date after 200 days from today : 8/2/2013
current time in GMT: 6:12:53
Time after 3 hours : 9:12:53
Time before 3 hours : 6:12:53
Time after 3 minutes : 6:15:53
Time before 3 minuets : 3:15:53

And if Need Some More ways to solve your probelem check this stackoverflow post How can I increment a date by one day in Java?

Stenger

Answer 4

Avoid legacy classes

Never use the terribly flawed legacy date-time classes such as Calendar, SimpleDateFormat, Date, etc. These have been supplanted by the modern java.time classes defined in JSR 310.

java.time

Get today's date. This requires a time zone because for any given moment the date varies around the globe by time zone. It is "tomorrow" in Tokyo Japan while simultaneously "yesterday" in Toledo Ohio US.

ZoneId z = ZoneId.of( "America/Edmonton" ) ;  // Or ZoneId.systemDefault()
LocalDate today = LocalDate.now( z ) ;

Add seven days.

LocalDate sevenDaysLater = today.plusDays( 7 ) ;

Generate localized text using DateTimeFormatter.ofLocalized…. Covered already in many other Questions.

Precaution