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Set Calendar Date to Current Date

I have variable with value of timeInMills which is past 3 days ago, I wanted to reset the date of it to current date but the time should be still.
Calendar calNow = Calendar.getInstance();
Calendar calSets = (Calendar)calNow.clone();
calSets.setTimeInMillis(TIME_IN_MILL); //set datetime from timeInMillis
//Reset the date to current Date.
How to do that?

Like this, get the properties you want, before you change the instance:
Calendar calNow = Calendar.getInstance();
Calendar calSets = (Calendar)calNow.clone();
int hours = calNow.get(Calendar.HOUR_OF_DAY)
int minutes = calNow.get(Calendar.MINUTE)
calSets.setTimeInMillis(TIME_IN_MILL); //set datetime from timeInMillis
//Reset the date to current Date.
calSets.set(Calendar.SECOND, 0);
calSets.set(Calendar.MILLISECOND, 0);
calSets.set(Calendar.HOUR_OF_DAY, hours);
calSets.set(Calendar.MINUTE, minutes);

You can reset a Calendar by calling setTimeInMillis(System.currentTimeMillis()):
TimeZone.setDefault(TimeZone.getTimeZone("UTC")); // Just for testing
final long TIME_IN_MILL = 1563204600000L; // 2019-07-15 15:30 UTC
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(TIME_IN_MILL);
int hour = cal.get(Calendar.HOUR_OF_DAY);
int minute = cal.get(Calendar.MINUTE);
cal.setTimeInMillis(System.currentTimeMillis()); // Reset
cal.set(Calendar.HOUR_OF_DAY, hour);
cal.set(Calendar.MINUTE, minute);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);
System.out.println(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS").format(cal.getTime()));
The code prints 2019-07-18 15:30:00.000, which is todays date with the time of day from the TIME_IN_MILL value.
If you don't want to rely on System.currentTimeMillis(), just get the value from the Calendar object, first thing:
Calendar cal = Calendar.getInstance();
long now = cal.getTimeInMillis();
cal.setTimeInMillis(TIME_IN_MILL);
int hour = cal.get(Calendar.HOUR_OF_DAY);
int minute = cal.get(Calendar.MINUTE);
cal.setTimeInMillis(now);
cal.set(Calendar.HOUR_OF_DAY, hour);
cal.set(Calendar.MINUTE, minute);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);

Update entered date in CalendarView in Android

I have a Calendarview and an Edittext. I wish to take the date entered in the edittext in the format DD/MM/YYYY and set it on the Calendarview. The view should update the current date bubble to the set date.
I have already tried:
How to set focus on a specific date in CalendarView knowing date is "dd/mm/yyyy"
This is my current code:
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.YEAR, 2019);
calendar.set(Calendar.MONTH, Calendar.JUNE);
calendar.set(Calendar.DAY_OF_MONTH, 20);
long milliTime = calendar.getTimeInMillis();
CalendarView calendarView = findViewById(R.id.calendar);
calendarView.setFocusedMonthDateColor(Color.BLUE); //apparently this is deprecated so won't work. Not working without it either.
calendarView.setDate (milliTime); //this is supposed to change the date but isn't
Thanks in advance!

I have read your question and i have try to solve this problem. pass date(time in milliseconds) in long type value to set date in calendar view like this calendar_view.setDate(milliTime); try this code to achieve your goal .
Code
calendar_view = findViewById(R.id.calendar_view);
//replace date variable static value to your edit text
value
String date = "25/06/2019";
String parts[] = date.split("/");
int day = Integer.parseInt(parts[0]);
int month = Integer.parseInt(parts[1]);
int year = Integer.parseInt(parts[2]);
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.YEAR, year);
calendar.set(Calendar.MONTH, month);
calendar.set(Calendar.DAY_OF_MONTH, day);
long milliTime = calendar.getTimeInMillis();
calendar_view.setDate(milliTime);

how to get the elapsed time from the beginning of a month to now in android programmatically

I want to to get the elapsed time from the beginning of a month to now in android programmatically.
preferably using Calendar.getInstance().
For example today is 12/10/2018. so the duration in millisecs will be 12/01/2018 to 12/10/2018

To retrieve the beginning of the month:
val cal = Calendar.getInstance()
cal.set(Calendar.HOUR_OF_DAY, 0)
cal.clear(Calendar.MINUTE)
cal.clear(Calendar.SECOND)
cal.clear(Calendar.MILLISECOND)
cal.set(Calendar.DAY_OF_MONTH, 1)
Then to calculate elapsed in milliseconds:
val current = Calendar.getInstance()
val timePassedMilliseconds=current.timeInMillis-cal.timeInMillis

is your problem creating a new Calendar and populating it? you can create an empty one, and just populate with the fields that you are interested in.
Calendar now = Calendar.getInstance();
Calendar startOfMonth = new GregorianCalendar();
calendar.set(Calendar.DAY_OF_MONTH, 1); //first day of month
calendar.set(Calendar.MONTH, now.get(Calendar.MONTH));
calendar.set(Calendar.YEAR, now.get(Calendar.YEAR);
timeElapsed = now.getTimeInMillis() - startOfMonth.getTimeInMillis() ;

You can use calendar.set(year,month,1,0,0,0); to get the timestamp of the first day of the month.
Calendar calendar = Calendar.getInstance();
Date d = new Date(1544371200000L); //12/10/2018
calendar.setTime(d);
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH);
calendar.set(year,month,1,0,0,0);
Date firstDayOfMonth = calendar.getTime();
long duration = d.getTime() - firstDayOfMonth.getTime();

how to get next month date from specified date in Android

I'm designing a program where in my recylerview i wanted to display a list of items whose date is 4 days less or more than current date.

This will work for month:
Calendar cal = Calendar.getInstance();
cal.add(Calendar.MONTH, 1);
This will work for -4 day:
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DAY_OF_MONTH, -4);

Android java timepicker.getTime() method?

I have the following situation:
Calendar calendar = Calendar.getInstance();
Date currenthour= calendar.getTime();
if (currenthour.after(timePicker.getTime()) && currenthour.before(timePicker2.getTime())){
//DO SOMETHING
}
It seems that timePicker.getTime() does not exist. Can a getTime() function can
be created for timePicker? Or is there a simpler method to get this to work?

Try it this way... Be carefull to check also seconds and miliseconds...
Avoid converting time to String!!
Calendar calendar = Calendar.getInstance();
Date currenthour= calendar.getTime();
Calendar calendarTmp = Calendar.getInstance();
calendarTmp.set(Calendar.HOUR_OF_DAY, timePicker.getCurrentHour());
calendarTmp.set(Calendar.MINUTE, timePicker.getCurrentMinute());
calendarTmp.set(Calendar.SECOND, 0);
if (currenthour.after(calendarTmp.getTime()) && currenthour.before(calendarTmp.getTime())){
//DO SOMETHING
}

In TimePicker you can get this hour and minute to Integer variable.
Like
int hour = timePicker.getCurrentHour();
int minute = timePicker.getCurrentMinute();