Develop Reference

json to human readable date date shows one less than actual date

I convert json date to human readable date but it shows less one then actual date. I
used this code to convert it:
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
Long timeInMillis = Long.valueOf(AttendanceModelList.get(position).getEmpdate());
calendar.setTimeInMillis(timeInMillis);
Date date=new Date(timeInMillis);
viewHolder.textemployeedate.setText(df.format(date));
Please help

You say as summary:
Your calendar date is one day less than expected when you try to
interprete a global timestamp of type java.util.Date as calendar
date.
This phenomenon can happen due to timezone effects or midnight change. Before viewing the technical solution, you have to ask yourself:
What is your default (system) timezone using TimeZone.getDefault()?
Do you run your code on a server which has not the expected timezone?
In which timezone do you wish to view the calendar date? (the timezone associated with your expected "actual" date)
How to specify the timezone?
java.util.Date d = ...; // from your JSON-timeInMillis?
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String tz = "Asia/Kolkata"; // or any other valid tz id
sdf.setTimeZone(TimeZone.getTimeZone(tz));
System.out.println(sdf.format(d));

Changing timezone to IST

I am programmatically trying to set the timezone to Indian Standard Time (IST) in Android, but nothing seems to work!
Here's the code snippet:
SimpleDateFormat s = new SimpleDateFormat("HH:mm:ss");
TimeZone.setDefault(TimeZone.getTimeZone("Asia/Kolkata"));
// TimeZone.setDefault(TimeZone.getTimeZone("GMT +5:30"));
// TimeZOne.setDefault(TimeZone.getTimeZone("IST"));
Calendar c = Calendar.getInstance();
System.out.println(s.format(c.getTime()));

Rather than changing the default time zone (which you're doing after creating the SimpleDateFormat) you should just set the time zone of the SimpleDateFormat:
SimpleDateFormat s = new SimpleDateFormat("HH:mm:ss");
s.setTimeZone(TimeZone.getTimeZone("Asia/Kolkata"));
System.out.println(s.format(new Date()));

How to get Current Date and time of Dubai in Android?

I am getting current date of the device, but i want the date and time of city Dubai, Any one please help me in doing this.when the activity called the date and time should be displayed,
Any help will be appriciated. thank you..

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date parsed = format.parse("2011-03-01 15:10:37");
// => This time is in the user phone timezone, you will maybe need to turn it in UTC!
TimeZone tz = TimeZone.getTimeZone("Asia/Dubai");
format.setTimeZone(tz);
String result = format.format(parsed);

You can use TimeZone to pass to the SimpleDateFormat
SimpleDateFormat sdf = new SimpleDateFormat(format, Locale.US);
sdf.setTimeZone(TimeZone.getTimeZone("Asia/Dubai"));

Data use only hour minute seconte

Im working on android and parse some XML file
I get some date with this
DateFormat h = new SimpleDateFormat ("hh:mm:ss", Locale.FRANCE);
DateFormat d = new SimpleDateFormat ("yyyy-M-dd'T'hh:mm:ss", Locale.FRANCE);
Date hdebut = h.parse(maString);
Probleme is Date is for Date not hour so it give me a 1 january 1970(start of timestamp right?) a the correct our so i can't compare by using
Date now new Date();
now.after(hdebut);
i have some method to getHours or month but they are decrepetead so i don't know if i can use them or if wa have a better way no to do it
Any idea?

Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR);
Try this. There are a lot of constants you can use with Calendar class.

Date is deprecated. You should be using Calendar instead.
Calendar provides working after and before methods as well and should work with pretty much any date you'll get to use :).

Calendar not returning GMT

I am trying to get a calendar object set to GMT, but the getTime() always returns the time in GMT+1 (my current time). I have tried:
Calendar cal = new GregorianCalendar(TimeZone.getTimeZone("GMT"));
Calendar cal = new GregorianCalendar(TimeZone.getTimeZone("UTC"));
Calendar cal = new GregorianCalendar(TimeZone.getTimeZone("skeniver"));
They all apparently return GMT, because
cal.getTimeZone().getDisplayName()
returns "GMT+00:00"; but
cal.getTime().toString();
always displays the time in GMT+1.
Does anyone have any idea why this is happening?

You need to adjust for daylight savings. I'm not sure if this will help but it's code I use for adjusting any timezone to UTC in an app that's currently being used by a number of people around the world. I use Date instead of Calendar but it works...
Date dateTimeNow = new Date();
TimeZone tz = TimeZone.getDefault();
int currentOffsetFromUTC = tz.getRawOffset() + (tz.inDaylightTime(dateTimeNow) ? tz.getDSTSavings() : 0);
Date dateTimeNowUTC = new Date(dateTimeNow.getTime() - currentOffsetFromUTC);

If you want to in string then prefer the DateFormat or SimpleDateFormat for this
here is example
SimpleDateFormat sdf = new SimpleDateFormat(); // here you can also define your format of date for e.g. "dd/MM/yyyy z"
sdf.setTimeZone("GMT");
Calendar cal = Calendar.getInstance();
System.out.println(sdf.format(cal.getTime()));

Calendar.getTime() returns a Date object. In Java, a Date is just a holder to a long timestamp starting in the UNIX epoch.
To display a Date in a different TimeZone than the default, you can use a SimpleDateFormat.