Develop Reference

How to get total number of months from a specific Date?

I am new to Android.I have a requirement, I have a field to enter the Date Of Birth of a person.On successful selection I wanna return the total number of months from the DOB to current date.For example, if I entered DOB as 19/10/2012 I wanna return 36(months).I searched for this, but didn't find anything suitable to my requirement.Here is my current code which return sucessful data,
private void showDate(int year, int month, int day) {
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(0);
cal.set(year, month, day);
Date date = cal.getTime();
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
if(System.currentTimeMillis() > date.getTime()) {
edtDate.setText(sdf.format(date));
LocalDate date1 = new LocalDate(date);
LocalDate date2 = new LocalDate(new java.util.Date());
PeriodType monthDay = PeriodType.yearMonthDayTime();
Period difference = new Period(date1, date2, monthDay);
int months = difference.getMonths();
months=months + 1;
System.out.println("16102015:Nunber of Months"+months);
}else{
Toast.makeText(mActivity,getResources().getString(R.string.date_validationmsg),Toast.LENGTH_LONG).show();
}
}

Calendar startCalendar = new GregorianCalendar();
startCalendar.setTime(startDate);
Calendar endCalendar = new GregorianCalendar();
endCalendar.setTime(endDate);
int diffYear = endCalendar.get(Calendar.YEAR) - startCalendar.get(Calendar.YEAR);
int diffMonth = diffYear * 12 + endCalendar.get(Calendar.MONTH) - startCalendar.get(Calendar.MONTH);

To start with, I'd suggest using LocalDate instead of DateTime for the computations. Ideally, don't use java.util.Date at all, and take your input as LocalDate to start with (e.g. by parsing text straight to that, or wherever your data comes from.) Set the day of month to 1 in both dates, and then take the difference in months:
private static int monthsBetweenDates(LocalDate start, LocalDate end) {
start = start.withDayOfMonth(1);
end = end.withDayOfMonth(1);
return Months.monthsBetween(start, end).getMonths();
}
UPDATE 1
see this link the OP is accepted the same answer because Months.monthsBetween() method is not working proper for him
UPDATE 2
LocalDate userEnteredDate = LocalDate.parse( new SimpleDateFormat("yyyy-MM-dd").format(date));
LocaleDate currentDate = LocalDate.parse( new SimpleDateFormat("yyyy-MM-dd").format(new Date()));
int months = monthsBetweenDates(userEnteredDate, currentDate)

Using Joda-time library here, I was able to get the desired result.
Try the below code it would give the desired the difference in months.
DateTime date1 = new DateTime().withDate(2012, 10, 19);
DateTime today = new DateTime().withDate(2015, 10, 19);
// calculate month difference
int diffMonths = Months.monthsBetween(date1.withDayOfMonth(1), today.withDayOfMonth(1)).getMonths();

Using JodaTime, it's really easy:
http://www.joda.org/joda-time/apidocs/
int nMonths = new Period(startTime, endTime).getMonths();

Use this code to calculate months between two dates
public static int monthsBetweenUsingJoda(Date d1, Date d2) {
return Months.monthsBetween(new LocalDate(d1.getTime()), new LocalDate(d2.getTime())).getMonths();
}

Cant fetch current time, date showing year as 1970

public static final String inputFormat = "HH:mm";
private Date date;
private Date dateCompareOne;
private Date dateCompareTwo;
LINE 5:
private String compareStringOne = String.valueOf(SetTimeActivity.intFromTimeH)+ ":"+ String.valueOf(SetTimeActivity.intFromTimeM) ;
LINE 6:
private String compareStringTwo = String.valueOf(SetTimeActivity.intToTimeH) + ":"+ String.valueOf(SetTimeActivity.intToTimeM);
SimpleDateFormat inputParser = new SimpleDateFormat(inputFormat, Locale.US);
private void compareDates()
{
Calendar now = Calendar.getInstance();
int hour = now.get(Calendar.HOUR_OF_DAY);
int minute = now.get(Calendar.MINUTE);
date = parseDate(hour + ":" + minute);
dateCompareOne = parseDate(compareStringOne);
dateCompareTwo = parseDate(compareStringTwo);
if (!(dateCompareOne.before( date ) && dateCompareTwo.after(date))) {
....
I am trying to check if current time falls between the specified time. For that I am converting the specified time into strings first (in Line5 & Line6). Even though I get the integer values correct, the string formed always shows "0:0".
Also, the year is shown as 1970 (The date & the day shown are wrong as well).
I need to get the current time. What am I doing wrong?
private Date parseDate(String date) {
try {
return inputParser.parse(date);
} catch (java.text.ParseException e) {
return new Date(0);
}
}

The parseDate() function returns the time elapsed since the 1st of January 1970. This is known as the Unix Epoch, and it's how all time is represented in Unix computers. By running the parseDate function on a string containing just hours and minutes, you're creating a Date object which represents a time HH:mm past the first of January 1970.
Your code is using a really odd way of getting the current time. Converting a Calendar to two ints, then to a string and finally parsing back to a Date is going to be inefficient and open you up to all sorts of needless errors.
When you initialise a new Date object it is automatically assigned the time of initialisation. Therefore:
Date d = new Date();
would result in d being the moment of initialisation (that is, this year, month, day, hour, minute, second and microsecond). Then you can just use Date.after() and Date.before().
If you still want to do it via the Calendar method, then you'd be better served by:
cal = Calendar.getInstance();
Date d = cal.getTime();
It may be that you've got other issues, but it's worth doing it properly first. When you pass data by writing it as a string (especially when it's time related, with all sorts of ambiguities about what "12" actually represents) you lose all the advantages that language typing gives you.

this code help you
final Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE); if (c.get(Calendar.AM_PM) == Calendar.AM)
am_pm = "AM";
else if (c.get(Calendar.AM_PM) == Calendar.PM)
am_pm = "PM";
// Calendar c = Calendar.getInstance();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss a");
String formattedDate = df.format(c.getTime());
Toast.makeText(this, formattedDate, Toast.LENGTH_SHORT).show();

If you already work with Date objects why not using the Date.after(...) and Date.before(...) methods.

How to get day, month and year from DatePickerDialog?

I'd like to get day, month and year values for save to db. These are my codes:
Declaretions:
private TextView tv_purchase_date;
private Button mPickDate;
private int mYear;
private int mMonth;
private int mDay;
OnClickListener listener_show_dlg = null;
OnDateSetListener listener_mdate_display = null;
Event Code:
listener_show_dlg = new OnClickListener() {
public void onClick(View v) {
Calendar cal=Calendar.getInstance();
DatePickerDialog datePickDlg = new DatePickerDialog(
ItemsAddActivity.this,
listener_mdate_display,
cal.get(Calendar.YEAR),
cal.get(Calendar.MONTH),
cal.get(Calendar.DAY_OF_MONTH)
);
datePickDlg.show();
};
};
listener_mdate_display = new OnDateSetListener() {
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
mMonth = month;
mYear = year;
mDay = dayofMonth;
tv_purchase_date.setText(dayOfMonth + "/" + monthOfYear + "/" + year);
}
};
}
I try to store mMonth, mYear and mDay values in db. What is the best store type? as integer or as string??

I store in the DB one number that represents the date. It is the number of seconds that have passed since the beginning of the modern era (Jan 1, 1970.) From the Date Picker, you can get the M D Y values like this:
datePickerListener = new DatePickerDialog.OnDateSetListener() {
public void onDateSet(DatePicker view, int yearOfYear,
int monthOfYear, int dayOfMonth) {
// the user has picked these values
year = yearOfYear;
month = monthOfYear;
day = dayOfMonth;
Then, I turn these into a single Date object like this.
Calendar cal = new GregorianCalendar(year, month, day);
Date dateOfGames = cal.getTime();
DateFormat df = DateFormat.getDateInstance(DateFormat.LONG);
String cs = df.format(dateOfGames);
changeDateButton.setText(cs); // update the interface
}
};
before I put it in the DB, I turn it into a numebr of seconds like this:
long seconds = date.getTime() / 1000; // this is the date in seconds since the start of the epoch
....
when I take that single number of seconds out of the DB, and want it to be a Date object again, I do this:
date = new Date(seconds * 1000); // converting seconds to a Date object
You can use a DateFormat object to display the date object how you like to see it.
I know this is awkward. Since SQLite doesn't allow you to store a Date, the answer is going to be awkward. Perhaps there is a cleaner way than this, and others will recommned something. :)

I struggled with this issue for a while. I don't konw of anything better than this.
I stored the date in the DB as a single long int. It is pretty easy to convert your Date to the number of seconds since the epoch (Jan 1, 1970), and it is also easy to convert the number of seconds into a Date object.
You need to be careful with seconds and milliseconds.
date = new Date(seconds * 1000); // converting seconds to a Date
seconds = date.getTime() / 1000; // this is the date in seconds since the start of the epoch
// Use Greg calendar to get a Date object from day, month, year
Date dateOfGames = new GregorianCalendar(year, month, day).getTime();
Does that help at all?

I created sqllite table with this sql string:
create table items (id INTEGER PRIMARY KEY AUTOINCREMENT, pdate DATE)
I writed some methods to convert date:
public String date_to_str(Date date) {
String pattern = "dd.MM.yyyy";
SimpleDateFormat dateFormat = new SimpleDateFormat(pattern);
Log.d(_watcher_name, "date_to_str" + dateFormat.format(date));
return dateFormat.format(date);
}
public Date mdy_to_date (int day, int month, int year) {
Calendar cal = new GregorianCalendar(year, month, day);
return cal.getTime();
}

Is there a function for adding time in android?

I have 09:30 as a time retrieved from a database, I need to add 15 minutes to get it as 09:45.
Is there a function for adding time?

String RevisedTime=cursor.getString(cursor.getColumnIndex("RevisedEstimatedDeliveryTime"));
// get hour and minute from time string
StringTokenizer st1 = new StringTokenizer(RevisedTime, ":");
int j = 0;
int[] val = new int[st1.countTokens()];
// iterate through tokens
while (st1.hasMoreTokens()) {
val[j] = Integer.parseInt(st1.nextToken());
j++;
}`enter code here`
// call time add method with current hour, minute and minutesToAdd,
// return added time as a string
String dateRevisedEstimatedDeliveryTime = addTime(val[0], val[1], 15);
public String addTime(int hour, int minute, int minutesToAdd) {
Calendar calendar = new GregorianCalendar(1990, 1, 1, hour, minute);
calendar.add(Calendar.MINUTE, minutesToAdd);
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");
String date = sdf.format(calendar.getTime());
return date;
}

http://download.oracle.com/javase/1.5.0/docs/api/java/util/Calendar.html has what you need, using its add() method.

Try like this
final Calendar cld = Calendar.getInstance();
cld.setTimeInMillis(time);
cld.add(Calendar.MINUTE,15)

use Calendar.add(Calendar.MINUTE,15) to get that

Need get Time in a 24 hour format while adding Time

I had written a function for Adding time as given below
private void Delay15Minute() {
String pkManifest = manifest.pkManifestNo;
manifest_helper = new manifest_helper(this);
cursor = manifest_helper.GetDeliveries(pkManifest);
cursor.moveToFirst();
for (int i = 0; i < cursor.getCount(); i++) {
cursor.getString(cursor.getColumnIndex("PKDelivery"));
// String
// RevisedTime=cursor.getString(cursor.getColumnIndex("RevisedEstimatedDeliveryTime"));
String RevisedTime = "12:55";
// get hour and minute from time string
StringTokenizer st1 = new StringTokenizer(RevisedTime, ":");
int j = 0;
int[] val = new int[st1.countTokens()];
// iterate through tokens
while (st1.hasMoreTokens()) {
val[j] = Integer.parseInt(st1.nextToken());
j++;
}
// call time add method with current hour, minute and minutesToAdd,
// return added time as a string
String date = addTime(val[0], val[1], 15);
// Tioast the new time
Toast.makeText(this, "date is =" + date, Toast.LENGTH_SHORT).show();
}
}
public String addTime(int hour, int minute, int minutesToAdd) {
Calendar calendar = new GregorianCalendar(1990, 1, 1, hour, minute);
calendar.add(Calendar.MINUTE, minutesToAdd);
SimpleDateFormat sdf = new SimpleDateFormat("hh:mm");
String date = sdf.format(calendar.getTime());
return date;
}
I am getting the oupt of this as 01:10 as 12 hours fromat...
I need to get it in 13:10 format ie 24 hour format.....Please help me

You used hh in your SimpleDateFormat pattern. Thats the 12 hour format. Use kk instead, that gives you the hours of the day in a 24 hour format. See SimpleDateFormat.

Simply create the instance of Calendar and get 24 hr time by,
Calendar c = Calendar.getInstance();
int Hr24=c.get(Calendar.HOUR_OF_DAY);
int Min=c.get(Calendar.MINUTE);

Use this code
long date = System.currentTimeMillis();
SimpleDateFormat date1 = new SimpleDateFormat("dd-MM-yyyy"); // for current date
SimpleDateFormat time1 = new SimpleDateFormat("kk:mm:ss"); // for 24 hour time
SimpleDateFormat time2 = new SimpleDateFormat("hh:mm:ss"); // for 12 hour time
String dateString = date1.format(date); //This will return current date in 31-12-2018 format
String timeString1 = time1.format(date); //This will return current time in 24 Hour format
String timeString2 = time2.format(date); //This will return current time in 12 Hour format
Log.e("TAG_1", "24 hour Time - " + timeString1);
Log.e("TAG_1", "24 hour Time - " + timeString1);
Log.e("TAG_1", "dd-MM-yyyy Date format - " + dateString);
than open your logcat to check result.