Get System Date and Time Store it in string Android

Question

I am Stuck on something. What I want is to get system date and time, Store it in string ,then add random time in other strings , then compare them with each other using if else ( eg

if(dateTime1 > dateTime2) {

}

Then I want to show the message like displayed in gmail ( If the mail is send today gmail shows the time today at 5 pm ). And I want to show those all in text Boxes . I want the message like today 4pm , yesterday 4 pm and if it exceeded a week then simply show the date and time. Need your help hope you got what I want. Kindly help me.This is what I done so far. Also tried many other things.

 public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    TextView ShowDate = (TextView) findViewById(R.id.ShowDate);
    TextView ShowToday = (TextView) findViewById(R.id.ShowToday);
    TextView ShowWeek  = (TextView) findViewById(R.id.ShowWeek );
    TextView ShowAgo  = (TextView) findViewById(R.id.ShowAgo ); 
    Calendar ci = Calendar.getInstance();

    String CiDateTime = "" + ci.get(Calendar.YEAR) + "-" +
        (ci.get(Calendar.MONTH) + 1) + "-" +
        ci.get(Calendar.DAY_OF_MONTH) + " " +
        ci.get(Calendar.HOUR) + ":" +
        ci.get(Calendar.MINUTE) +  ":" +
        ci.get(Calendar.SECOND);

Answer 1

ohk i will give u a example which a make in my code i take diff of time which is current and from 1 jan 1970 i calculate time diff like this may this will help u just put your time instead of my time rest of all code as it is use

 Calendar cal = Calendar.getInstance();
    Date currentLocalTime = cal.getTime();
    DateFormat date = new SimpleDateFormat("MM/dd/yyyy hh:mm:ss a");  
    date.setTimeZone(TimeZone.getTimeZone("GMT")); 
    String localTime = date.format(currentLocalTime); 

    long currenttime = Constant.retunlongdate(localTime);
    long fixtimejan = Constant.retunlongdate("01/01/1970 00:00:00 AM");

    long nTimeStamp = (currenttime - fixtimejan)/1000;
    System.out.println("and result is == " + nTimeStamp);

 public static long retunlongdate(String givenDateString)
        {

        SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy hh:mm:ss a"); 

        long timeInMilliseconds=0;
        try {
            Date mDate =sdf.parse(givenDateString);
              timeInMilliseconds = mDate.getTime();
            System.out.println("Date in milli :: " + timeInMilliseconds);
            return timeInMilliseconds;
        } catch (ParseException e) {
                    e.printStackTrace();
        } catch (java.text.ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
    }
        return timeInMilliseconds;
    }