Develop Reference

Timestamp to Date/Time

I am trying to make a football Livescore app. And I need to show the match time to users as their local match time.
if I was generated a Timestamp from a given timezone, lets say it is
autodatetime(1517009400,6.5); //original timezone included
//I can make it done in javascript by https://www.autodatetime.com/
But I was trying to get it from Android with this code
public String getconvertedtime(long timestamp) {
try{
Toast.makeText(getApplicationContext(),Integer.toString(TimeZone.getDefault().getDSTSavings()),Toast.LENGTH_LONG).show();
Calendar calendar = Calendar.getInstance();
TimeZone tz = TimeZone.getDefault();
//getTimezonedifference() return 0 for me
timestamp= timestamp-getTimezonedifference();
calendar.setTimeInMillis(timestamp * 1000);
calendar.add(Calendar.MILLISECOND, (tz.getOffset(calendar.getTimeInMillis())-tz.getDSTSavings()));
DateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy hh:mm:ss aa");
Date currentTimeZone = calendar.getTime();
return dateFormat.format(currentTimeZone);
}catch (Exception e) {
return "";
}
}
public int getTimezonedifference() {
TimeZone tz = TimeZone.getDefault();
Calendar cal = GregorianCalendar.getInstance(tz);
double offsetInMillis = tz.getOffset(cal.getTimeInMillis());
//String offset = String.format("%02d:%02d", Math.abs(offsetInMillis / 3600000), Math.abs((offsetInMillis / 60000) % 60));
//offset = "GMT"+(offsetInMillis >= 0 ? "+" : "-") + offset;
offsetInMillis= Math.abs((offsetInMillis)-(6.5*3600000));
int vall=(int)offsetInMillis;
return vall;
}
Unfortunately It was returning wrong time, I can't figure it out why it was showing faster hours .
The result is 01/27/2018 12:30:00 PM
It must be 01/26/2018 11:30:00 PM for my Local TimeZone(6.5)
And I found something about different DST problems from googling and get 0 from "TimeZone.getDefault().getDSTSavings()" on Toast.
Please guide me to the solution, I am new to android programming. Thank you for reading.

Given epoch of 1517009400, which is 01/26/2018 23:30:00 GMT, to show this time in user's local time:
// convert to epoch milli seconds
long ts = 1517009400000l;
Date date = new Date(ts);
DateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");
String dateStr = dateFormat.format(date);
android.util.Log.i("TEST", "dateStr: " + dateStr);
dateStr will be formatted according to timezone of user's phone. For example, my phone is set to Asia/Kuala_Lumpur timezone, which is GMT+8, so it shows 01/27/2018 07:30:00.
To format date string into particular timezone (eg: New York), you can try this:
DateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");
format.setTimeZone(TimeZone.getTimeZone("America/New_York"));
String dateStr = dateFormat.format(date);
This outputs 01/26/2018 18:30:00.

How to fetch recent seven days from specific date

If the date is 2017-03-30 that i want to fetch the date from 2017-03-23 to 2017-03-30
I try to use this code let my String change to Date format
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date dateParse = sdf.parse("2017-03-30");
then i'm stuck , cause i take the reference is get the current time like this
Calendar c = Calendar.getInstance();
c.add(Calendar.DATE, -7);
//may be my dateParse should put here , but i don't know how to do
Date monday = c.getTime();//it get the current time
String preMonday = sdf.format(monday);
Is any one can teach me how to fetch these seven days ? Thanks in advance.

You can use the code below
SimpleDateFormatdateFormat = new SimpleDateFormat("dd MMM yyyy");
Calendar c = Calendar.getInstance();
String date = dateFormat.format(c.getTime());
c.add(Calendar.DATE, 7);
String date1 = dateFormat.format(c.getTime());

Parse the date:
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date myDate = sdf.parse("2017-03-30");
First Solution 1) And then either figure out how many milliseconds you need to subtract:
Date newDate = new Date(myDate.getTime() - 604800000L); // 7 * 24 * 60 * 60 * 1000
Second Solution 2) Or use the API provided by the java.util.Calendar class:
Calendar calendar = Calendar.getInstance();
calendar.setTime(myDate);
calendar.add(Calendar.DAY_OF_YEAR, -7);
Date newDate = calendar.getTime();
Then, if you need to, convert it back to a String:
String date = dateFormat.format(newDate);
This answer is from here
EDIT:
If you need output as 2017-03-29 2017-03-28 2017-03-27 ...... 2017-03-23 then try below code
for(int i = 1; i <= 7; i++){
Calendar calendar = Calendar.getInstance();
calendar.setTime(myDate);
calendar.add(Calendar.DAY_OF_YEAR, -i);
Date newDate = calendar.getTime();
String date = dateFormat.format(newDate);
//here in date you can get all date from and output as 2017-03-29 2017-03-28 2017-03-27 ...... 2017-03-23
}
Hope you need this

How convert timestamp to date on android?

I want convert timestamp to date and set time in this day to 12.00.
How can I do this?
If I use this:
Date date = new Date(event.getActionDate()*1000);
I can't set hour or minutes to this date, becouse methods for this operations are deprecated.
Explanation:
I have timestamp -
1461924872 // Fri, 29 Apr 2016 10:14:32 GMT
I want change hour in this timestamp (10:14 to 00.00).

long timeInMillis = 1461877200000l;
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(timeInMillis);
System.out.println("Date1:"+calendar.getTime().toString());
calendar.set(Calendar.HOUR_OF_DAY, 0); //For 12 AM use 0 and for 12 PM use 12.
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
Date date = calendar.getTime();
System.out.println("Date2:"+date.toString());

Calendar cal = Calendar.getInstance();
TimeZone tz = cal.getTimeZone();//get your local time zone.
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy hh:mm a");
sdf.setTimeZone(tz);//set time zone.
String localTime = sdf.format(new Date(time) * 1000));
Date date = new Date();
date = sdf.parse(localTime);

private String getDate(String timeStampStr){
try{
DateFormat sdf = new SimpleDateFormat("MM/dd/yyyy");
Date netDate = (new Date(Long.parseLong(timeStampStr)));
return sdf.format(netDate);
}
catch(Exception ex){
return dateInStr;
}
}
let me know if it is working?

How to convert Java.Util.Date to System.DateTime

In Xamarin.Android, you work with both .NET and Java.
I get a return value of Java.Util.Date, I then need to input that same value as a parameter that only takes System.DateTime
This is how I currently do it
public static DateTime ConvertJavaDateToDateTime(Date date)
{
var a = date.ToGMTString();
var b = date.ToLocaleString();
var c = date.ToString();
DateTime datetime = DateTime.ParseExact(date.ToGMTString(), "dd MMM yyyy HH:mm:ss 'GMT'", CultureInfo.InvariantCulture);
return datetime;
}
However on the first 9 days of any month, I only get 1 digit for the day, and the
DateTime.ParseExact function is looking for dd (i.e. 2 digits for the day).
a is a string with value "1 Sep 2014 14:32:25 GMT"
b is a string with value "1 Sep 2014 16:32:25"
c is a string with value "Mon Sep 01 16:32:25 EET 2014"
I wish I could find a simple, quick, reliable and consistent solution for this problem :D

java.util.Date has a getTime() method, which returns the date as a millisecond value. The value is the number of milliseconds since Jan. 1, 1970, midnight GMT.
With that knowledge, you can construct a System.DateTime, that matches this value like so:
public DateTime FromUnixTime(long unixTimeMillis)
{
var epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
return epoch.AddMilliseconds(unixTimeMillis);
}
(method taken from this answer)

Do this:
public DateTime ConvertDateToDateTime(Date date)
{
SimpleDateFormat dateFormat = new SimpleDateFormat("YYYY-MM-dd hh:mm:ss");
String dateFormated = dateFormat.format(date);
return new DateTime(dateFormated);
}

I'll update my answer, since you've changed the question.
you can use a long to hold the milliseconds and than convert the milliseconds to ticks(x10000) and create a new DateTime
Date date = new Date();
Long milliseconds = date.getTime();
Long ticks = milliseconds * 10000
DateTime datetime = DateTime(ticks);

I had this problem when authenticating with Facebook to receive the Expire time for the token. The solution was to do this:
var convertedTime = new DateTime(1970,1,1,0,0,0,DateTimeKind.Utc).AddMilliseconds(MyJavaUtil.Date.Time);

I used this:
DateTimeOffset.FromUnixTimeMilliseconds(date.Time - (date.TimezoneOffset * 60 * 1000)).DateTime;
To incorporate the timezone offset into my date.

In my case, only this code works correctly:
public static DateTime NativeDateToDateTime(Java.Util.Date date)
{
SimpleDateFormat dateFormat = new SimpleDateFormat("YYYY-MM-dd HH:mm:ss");
string dateFormated = dateFormat.Format(date);
return DateTimeOffset.Parse(dateFormated, null, DateTimeStyles.None).DateTime;
}

It is not tested but try with Calendar methods
public static String ConvertJavaDateToDateTime(Date date)
{
Calendar c = new GregorianCalendar();
c.setTime(date);
System.out.println(c.getTime());
return c.getTime();
}
Prints:
Tue Aug 06 00:00:00 EDT 2013

You can try with this also
public DateTime dateAndTimeToDateTime(java.sql.Date date, java.sql.Time time) {
String myDate = date + " " + time;
SimpleDateFormat sdf = new SimpleDateFormat("dd MMM yyyy HH:mm:ss 'GMT'");
java.util.Date utilDate = new java.util.Date();
try {
utilDate = sdf.parse(myDate);
} catch (ParseException pe){
pe.printStackTrace();
}
DateTime dateTime = new DateTime(utilDate);
return dateTime;
}

get current date and time

I'm kind of stuck on date and time.
I want my program to create the date like this "20121217". The first 4 letters are the year, the second 2 letters are the month and the last 2 are the day. year+month+day
The time is "112233" hour+minute+second
Thanks for your help!

That's a formatting issue. Java uses java.util.Date and java.text.DateFormat and java.text.SimpleDateFormat for those things.
DateFormat dateFormatter = new SimpleDateFormat("yyyyMMdd hhmmss");
dateFormatter.setLenient(false);
Date today = new Date();
String s = dateFormatter.format(today);

You can do something like this:
Calendar c = Calendar.getInstance();
String date = c.get(Calendar.YEAR) + c.get(Calendar.MONTH) + c.get(Calendar.DATE);
String time = c.get(Calendar.HOUR) + c.get(Calendar.MINUTE) + c.get(Calendar.SECOND);

Change any specific format of time or date as you need.
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_HHmmss");
currentDateandTime = sdf.format(new Date());

For date:
DateFormat df = new SimpleDateFormat("yyyyMMdd");
String strDate = df.format(new Date());
For time:
DateFormat df = new SimpleDateFormat("hhmmss");
String strTime = df.format(new Date());

This works,
String currentDateTime;
SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
currentDateTime = sdf1.format(new Date());

What you're looking for is the SimpleDateFormat in Java... Take a look at this page.
Try this for your need:
SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd hhmmss");
Date parsed = format.parse(new Date());
System.out.println(parsed.toString());

You can use following method to get current time
/**************************************************************
* getCurrentTime() it will return system time
*
* #return
****************************************************************/
public static String getCurrentTime() {
DateFormat dateFormat = new SimpleDateFormat("yyyyMMdd HHmmss");
Calendar cal = Calendar.getInstance();
return dateFormat.format(cal.getTime());
}// end of getCurrentTime()