Develop Reference

Convert Received date time to local timezone time Android

Good day.I am building an chat application.For purpose i decided to put a date of message had been sent.No wounder that in different countries the date must show different.For example let's take 2 different countries and assume the difference between them are 2 hours.CountryX and CountryY.The user send message from CountryX which time is lets say 15:00.I am saving this on server with exact timezone time as user sent,exactly 15:00 as CountryX.Second user receives the message in CountryY which is more in 2 hours from CountryX,so basically The time which I MUST show in CountryY must be 17:00.This is the issue.How can i convert an already received time with known timezone to local in order to show correct?I did google a lot but all i came up,were solutions where you would simply just get an time for exact country,and not convert the CountryX sent Time to CountryY local time to show it correctly in CountryY.Please can you provide an help?Thank you very much beforehand.

For everyone suffering because of this.I have ended up creating my own class with my own logic and it works flawlessly and as an extra bonus couple of handy methods with time
public class Time {
public static String getCurrentTime() {
Calendar calendar = Calendar.getInstance();
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH) + 1;
int day = calendar.get(Calendar.DAY_OF_MONTH);
int hour = calendar.get(Calendar.HOUR_OF_DAY);
int minute = calendar.get(Calendar.MINUTE);
int second = calendar.get(Calendar.SECOND);
String finalFormat = year + "-" + month + "-" + day + " " + hour + ":" + minute + ":" + second;
if (month < 10) {
String finalMonth = "0" + month;
finalFormat = year + "-" + finalMonth + "-" + day + " " + hour + ":" + minute + ":" + second;
}
return finalFormat;
}
public static String convertToLocalTime(String timeToConvert) {
SimpleDateFormat sourceFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
sourceFormat.setTimeZone(TimeZone.getTimeZone(Constants.SERVER_TIME_ZONE));//where server time zone is the time zone of your server as defauul,E.X -America/Los_Angeles
Date parsed;
try {
parsed = sourceFormat.parse(timeToConvert);
} catch (ParseException e) {
e.printStackTrace();
return "";
}
TimeZone tz = TimeZone.getDefault();
SimpleDateFormat destFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
destFormat.setTimeZone(tz);
String result = destFormat.format(parsed);
return result;
}
public static String getTimeZone() {
return TimeZone.getDefault().getID();
}
}

Date and time format in Android

How do you format correctly according to the device configuration a date and time when having year, month, day, hour and minute? for example I want to display 29 July, 2015, 10:30 Am, according to my time zone

You can use this method to format the datetime... u can replace new java.util.Date() with any datetime variable...
android.text.format.DateFormat df = new android.text.format.DateFormat();
df.format("dd-MMM-yyyy hh:mm aa", new java.util.Date());

String strDateTime = "29 July, 2015, 10:30 Am";
SimpleDateFormat sdf = new SimpleDateFormat("dd MMMM, yyyy, hh:mm a");
strDateTime = sdf.format(Calendar.getInstance().getTime());
holder.txtTime.setText(strDateTime);
Please integrate the above code, that works fine for me.
Any help, do let me know.

Please Find the below solution
Calendar ci = Calendar.getInstance();
String AM_PM;
if(ci.get(Calendar.AM_PM)==0)
{
AM_PM ="AM";
}
else
{
AM_PM ="PM";
}
String CiDateTime = "" + ci.get(Calendar.DAY_OF_MONTH)+" "+
(ci.get(Calendar.MONTH) + 1)+","+
ci.get(Calendar.YEAR) + "-" +
+ "," +getCurrentTime()
+" "+AM_PM;
Call the method
private String getCurrentTime()
{
int hrsRight = 0;
Calendar c = Calendar.getInstance();
int hrs = c.get(Calendar.HOUR);
int min = c.get(Calendar.MINUTE);
if (hrs>12)
{
hrsRight = hrs - 12;
}
else
{
hrsRight = hrs;
}
return String.valueOf(hrsRight)+":"+String.valueOf(min);
}

Issue in convert calendar object to date android

I want to convert calendar object to date as follow.
int year,month,day;
mCalendarEnd = Calendar.getInstance();
year = mCalendarEnd.get(Calendar.YEAR);
month = mCalendarEnd.get(Calendar.MONTH)+1;
day = mCalendarEnd.get(Calendar.DAY_OF_MONTH);
Now convert it to date object
Date d1 = new Date(day,month,year);
when I print date object:
System.out.println("Date : "+d1.getDay()+"/"+d1.getMonth()+"/"+d1.getYear());
it should print current date but in above code it prints the wrong date. Any idea how can I solve this problem? your all suggestion are appreciable.

You need to do it like this
//Set calendar
Calendar calendar = Calendar.getInstance();
Date date1 = calendar.getTime(); // gives a date object
//To get day difference, Just an example
calendar.add(Calendar.DAY_OF_MONTH, -7);
Date date2 = calendar.getTime(); // gives a date object
long differenceInMillis = Date1.getTime() - Date2.getTime();
long differenceInDays = TimeUnit.DAYS.convert(differenceInMillis, TimeUnit.MILLISECONDS);
Or No need of date objects
Calendar calendar = Calendar.getInstance();
long date1InMillis = calendar.getTimeInMillis();
calendar.add(Calendar.DAY_OF_MONTH, -7);
long date2InMillis = calendar.getTimeInMillis();
long differenceInMillis = date1InMillis - date2InMillis;
long differenceInDays = TimeUnit.DAYS.convert(differenceInMillis, TimeUnit.MILLISECONDS);
calendar.getTimeInMillis()

calendar.getTime() returns Date object.
but if you just need today date new Date() returns today date as Date object, too.
Calendar example:
Calendar calendar = Calendar.getInstance()
Log.i("My Tag", "calendar getTime -----> " + calendar.getTime());
Output:
My Tag: calendar getTime -----> Wed Dec 05 13:03:43 GMT+03:30 2018
Date Example:
Log.i("My Tag", "new Date -----> " + new Date());
Output:
My Tag: new Date -----> Wed Dec 05 13:05:38 GMT+03:30 2018
as you see both of them have the same output.

Why you don't use just the calendar?
System.out.println("Date : " + day + "/" + month + "/" + year);
result 1/1/1900
or you want other format? but dont increment the month with 1
System.out.println("Date : " + day + "/" + new DateFormatSymbols().getMonths()[month] + "/" + year);
result 1/January/1900

Put this in your code:
Date d1 = new Date(year, month, day);
System.out.println("Date : " + d1.getDate() + "/" +d1.getMonth() + "/" + d1.getYear());
you will get the correct date.

d1=new Date(year, month, day);
System.out.println("Dt:"+d1.getDate()+"/"+d1.getMonth()+"/"+d1.getYear());

Trying to change calendar date format

I'm trying to convert the calendar which i set the time milliseconds from 1 1 1970 as below:
Calendar c = Calendar.getInstance();
c.setTimeInMillis(1417780800);
Although when I'm trying to convert this calendar to a string as in this format "yyyy-MM-dd HH:mm:ss" it always set the date as 1970-1-17 9:49:40 when it should be 2014-12-1 12:00:00
I used this way to convert the date:
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String date = format.format(c.getTime());
Also, using this way is getting wrong:
String date = "" + c.get(Calendar.YEAR) + "-" + c.get(Calendar.MONTH) + "-" + c.get(Calendar.DAY_OF_MONTH) + " " + c.get(Calendar.HOUR) + ":" + c.get(Calendar.MINUTE) + ":" + c.get(Calendar.SECOND);
Any idea why?
Thanks in advance.

You can try something like...
DateFormat.getDateInstance().format(1417780800);
It will return Date in String format.
Jan 17, 1970

How do I set AM/PM in a TimePicker?

I am using a TimePicker in my app. Whenever the user opens the screen with the TimePicker, I initialize it with the current time. When I do this, the TimePicker shows AM instead of PM. Why does this happen? Is there anything I have to add in my code?
Date initDate = m_NoteManageObject.getDateTimeArray(position);
Calendar myCal = Calendar.getInstance();
myCal.setTime(initDate);
TimePicker timePicker = (TimePicker)layout.findViewById(R.id.time_picker);
// Initialise Time Picker
timePicker.setCurrentHour(myCal.get(Calendar.HOUR));
timePicker.setCurrentMinute(myCal.get(Calendar.MINUTE));

You'll have to use Calendar.HOUR_OF_DAY instead of Calendar.HOUR.
i.e., timePicker.setCurrentHour() always expects the argument in 24-hour format. Unfortunately, this fact is not documented properly in the API documentation.

public void onTimeSet(TimePickerDialog view, int hourOfDay, int minute) {
if(hourOfDay>=0 && hourOfDay<12){
time = hourOfDay + " : " + minute + " AM";
} else {
if(hourOfDay == 12){
time = hourOfDay + " : " + minute + "PM";
} else{
hourOfDay = hourOfDay -12;
time = hourOfDay + " : " + minute + "PM";
}
}
deliveryTime.setText(time);
}

I think you have to override the onTimeSet() method of the Timepicker. Check this link
TimePickerDialog and AM or PM
May it helps you..

First, get an instance of the Calendar class, then use HOUR_OF_DAY to get the hour. HOUR_OF_DAY will be in 24-hour format so just assign that to a variable and then check whether that int is greater than 0 and less than 12. If this condition is true then append AM or else PM. Because HOUR_OF_DAY is 24-hour format, the PM hours will be displayed as 13,14 so to handle this, just subtract the HOUR_OF_DAY by 12. Here is the code:
Calendar calendar = Calendar.getInstance();
int hour = calendar.get(Calendar.HOUR_OF_DAY);
if (hour < 12 && hour >= 0) {
tv.setText(hour + " AM");
} else {
hour -= 12;
if(hour == 0) {
hour = 12;
}
tv.setText(hour + " PM");
}

Try this :
Calendar calendar = Calendar.getInstance();
calendar.set(0, 0, 0, hourOfDay, minute, 0);
long timeInMillis = calendar.getTimeInMillis();
java.text.DateFormat dateFormatter = new SimpleDateFormat("hh:mm a");
Date date = new Date();
date.setTime(timeInMillis);
time.setText(dateFormatter.format(date));