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How to convert Api String date to mm-dd-yy date format (Android) without the use of datepicker?null Pointer exception

I am getting Time from an api in this format
"2018-03-07T11:19:54.686Z" ..... How to convert this String data to mm-dd-yyyy date format in android.
SimpleDateFormat format = new SimpleDateFormat(" MM,dd,yy");
String date = format.format(Date.parse(data));
I have tried using the above two but there is a parse error.

First you have to parse the given date "2018-03-07T11:19:54.686Z" in the same format and then you can apply formatting with the desired format.
SimpleDateFormat parseDateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
String date = format.format(parseDateFormat.parse(data));

you used below code and show your format according to date.
String date="2018-03-07T11:19:54.686Z";
SimpleDateFormat parseDateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
DateFormat formatdate = new SimpleDateFormat("MM,dd,yy");//if show mm-dd-yy
try {
Date date1=parseDateFormat.parse(date);
Log.d("New Date",formatdate.format(date1));
} catch (ParseException e) {
e.printStackTrace();
}

How to parse Date format server format To "MM/dd/YYYY"

I was found many solution but its not working for me.
I am trying to parse date to user selected date format.
I was getting date from server in this format 2016-06-30T00:00:00Z UTC Timezone
Now I want to Parse it in User selected format for e.g MM/dd/yyyy
How Can i do that.? I was found many solution but its not working for me.

To get date into a particular format, first you have to parse the date string into it's given format and there you will get Date object. Second, you can convert the date object into a desired format.
private String getFormattedDate(String strDate) {
DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ");
Date d= (Date)formatter.parse(strDate);
SimpleDateFormat fmtOut = new SimpleDateFormat("MM/dd/yyyy");
return fmtOut.format(date);
}

This function help to convert any type of string date in any formate
public String getFormatedDate(String dateString, String format, String currentFormat) {
SimpleDateFormat sdf = new SimpleDateFormat(currentFormat, Locale.ENGLISH);
try {
Date date = sdf.parse(dateString);
String formated = new SimpleDateFormat(format).format(date);
return formated;
} catch (Exception e) {
e.printStackTrace();
return "";
}
}

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");

How to convert "year-month-day" date format(eg: 2015-05-12-which is a value retrieved from server) to "day-month-year" format in android

How to convert "year-month-day" date format(eg: 2015-05-12-which is a value retrieved from server) to "day-month-year" format in android .
The actual value I get from server is in yr-mnth-day format. But I need to display it as day-mnth-yr in my app.How can I achieve this?

First you'll need to parse the String into a Date. Then you format the date according to your needs, the example below is an edited version of BalusC's answer from this topic: Change date format in a Java string
String oldstring = "2015-05-12";
Date date = new SimpleDateFormat("yyyy-MM-dd").parse(oldstring);
//Use SimpleDateFormat#format() to format a Date into a String in a certain pattern.
String newstring = new SimpleDateFormat("dd-MM-yyyy").format(date);
System.out.println(newstring); // 12-05-2015

If you say this, i suppose you mean in a string, so you can convert string to Date with
String dateServer = "2015-05-12";
//Identify the format which has been used from server
DateFormat format = new SimpleDateFormat("yyyy, MM, dd", Locale.ENGLISH);
//Convert string to Date using this format
Date date = format.parse(string);
//Create the format you need to print
DateFormat wellFormatted = new SimpleDateFormat("dd/MM/yyyy");
//now convert the date into a string formatted as you like
String wellPrintedDate = wellFormatted.format(date);
that's all, "wellPrintedDate" is the string in format day/month/yeah. here you can find the list of code used for formatting :)

try {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Date past = format.parse("2015-05-12");
SimpleDateFormat format1 = new SimpleDateFormat("dd-MM-yyyy");
System.out.println("dt=" + format1.format(past));
} catch (ParseException e) {
e.printStackTrace();
}

public static String formattedDateFromString(String inputFormat, String outputFormat, String inputDate){
if(inputFormat.equals("")){ // if inputFormat = "", set a default input format.
inputFormat = "yyyy-MM-dd";
}
if(outputFormat.equals("")){
outputFormat = "dd-mm-yyyy"; // if inputFormat = "", set a default output format.
}
Date parsed = null;
String outputDate = "";
SimpleDateFormat df_input = new SimpleDateFormat(inputFormat, java.util.Locale.getDefault());
SimpleDateFormat df_output = new SimpleDateFormat(outputFormat, java.util.Locale.getDefault());
// You can set a different Locale, This example set a locale of Country Mexico.
//SimpleDateFormat df_input = new SimpleDateFormat(inputFormat, new Locale("es", "MX"));
//SimpleDateFormat df_output = new SimpleDateFormat(outputFormat, new Locale("es", "MX"));
try {
parsed = df_input.parse(inputDate);
outputDate = df_output.format(parsed);
} catch (Exception e) {
Log.e("formattedDateFromString", "Exception in formateDateFromstring(): " + e.getMessage());
}
return outputDate;
}
call like this
Log.e("",""+formattedDateFromString("yyyy-MM-dd","dd-MM-yyyy","2015-05-12"));
output: 12-05-2015

Changing date format stored as a String

Currently I store a date in my database in the following format
dbTimestamp = new SimpleDateFormat("yyyy-MM-dd").format(myCalendar.getTime());
I am looking to pull this information in a cursor and display it to the user in the following format
String newTimestamp = new SimpleDateFormat("MM/dd/yyyy").format(date);
How would I go about converting it from 2014-07-31 to 07/31/2014?
I tried using
String transactionDate = cursor.getString(cursor.getColumnIndex("timestamp"));
String newTimestamp = new SimpleDateFormat("MM/dd/yyyy").format(transactionDate);
But i get the following error: Bad class: class java.lang.String

try {
String reformattedStr = new SimpleDateFormat("dd/MM/yyyy").format(new SimpleDateFormat("yyyy-MM-dd").parse("2014-07-31"));
} catch (ParseException e) {
e.printStackTrace();
}

DateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy");
Date date = new Date();
String get="" + dateFormat.format(date);
System.out.println("Test date is:"+get);

How can i convert dropbox log timestamp?

I am debugging a android framework.
I pull out dropbox logs from device and it's created in /data/system/dropbox.
Log file name is printed like this format.
event_data#1362451303699
1362451303699 is timestamp and i want to change it like 05/03/2013 16:00 for legibility.
How can i convert this timestamp?
Is there any code needs to be changed?
Any help will be much appreciated.

use: Date date = new Date(timestamp);
Edit full code:
String wantedDate = "";
String log = "event_data#1362451303699";
int index = log.indexOf("#");
if(index != -1) {
index = index + 1; // skip # symbol
if(index < log.length()) { // avoid out of bounds
String logtime = log.substring(+1);
try {
long timestamp = Long.parseLong(logtime);
SimpleDateFormat df = new SimpleDateFormat("dd/MM/yyyy HH:mm");
Date date = new Date(timestamp);
wantedDate = df.format(date);
} catch (NumberFormatException nfe) {
// not a number
}
}
}
if( ! "".equals(wantedDate) ) {
// everything OK
} else {
// error cannot retrieve date!
}
Related doc:
indexOf : http://developer.android.com/reference/java/lang/String.html#indexOf%28java.lang.String%29
SimpleDateFormat : http://developer.android.com/reference/java/text/SimpleDateFormat.html

you can use a SimepleDateFormat to parse it. For example:
long ts = 1362451303699;
Date date = new Date(ts);
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy HH:mm");
System.out.println(sdf.format(date));
With the SimpleDateFormat you can bring your Date in a more readable format.

It is a UNIX epoch timestamp, all you need to do is to convert the String representation of the number to long, then you can use it to create a Date object, which you can format with DateFormat. Something like this:
// Get this from the log
String timestamp = "1362451303699";
long epoch = Long.parseLong(timestamp);
Date date = new Date(epoch);
DateFormat format = new SimpleDateFormat("dd/MM/yyyy HH:mm");
String formattedDate = format.format(date);