Develop Reference

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?

Android - cannot correctly parse the date of tomorrow

I'm trying to get the date of tomorrow and insert it into a Date type variable, but for some reason I'm getting an empty string.
Here his the code:
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DATE, 1);
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy HH:mm");
String time_Date_str = cal.getTime().toString();
try
{
Date myDate = new SimpleDateFormat("dd/MM/yyyy HH:mm").parse(time_Date_str);
Toast.makeText(this, "time_Date_str", Toast.LENGTH_SHORT).show();
t.setDueDate(myDate);
t.setHasDate(true);
} catch(Exception e){myDate=null;}
Please let me know what I'm doing wrong.

You're not using your sdf variable to format the date... try this:
String time_Date_str = sdf.format(cal.getTime());

How to set alarm manager using date and time from Textview

I am converting a timestamp into date and time and setting the result on a textview.
For example 1443884578 is Sat 3 October 2015 18:02
I would like to set the above date and time into an alarm manager.After research i found a code that uses a date time picker.
public void onDateSelectedButtonClick(View v) {
// Get the date from our datepicker
int day = picker.getDayOfMonth();
int month = picker.getMonth();
int year = picker.getYear();
// Create a new calendar set to the date chosen
// we set the time to midnight (i.e. the first minute of that day)
Calendar c = Calendar.getInstance();
c.set(year, month, day);
c.set(Calendar.HOUR_OF_DAY, 0);
c.set(Calendar.MINUTE, 0);
c.set(Calendar.SECOND, 0);
// Ask our service to set an alarm for that date, this activity talks to the client that talks to the service
scheduleClient.setAlarmForNotification(c);
// Notify the user what they just did
Toast.makeText(this, "Notification set for: " + day + "/" + (month + 1) + "/" + year, Toast.LENGTH_SHORT).show();
}
However its getting only the date and fires the alarm the minute the date occurs.
PROBLEM: I would like to get the date and time from my textview and skip this date time picker in the format i have. Is this possible?

String input = "Sat October 3 2015 18:02"; // Instead of String input = "Mon Feb 06 2015";
Calendar cal = Calendar.getInstance();
Date date = new Date();
// Changed the format to represent time of day
SimpleDateFormat sdf = new SimpleDateFormat("EEE MMM dd yyyy HH:mm:ss", Locale.ENGLISH);
try {
date = sdf.parse(input);
} catch (ParseException e) {
e.printStackTrace();
}
cal.setTime(date);
//We haven't parsed the seconds from the original date so this will result
//in 18:02:00 - 10seconds.
//For a correct calculation, you could parse the seconds as well
//See SimpleDateFormat above, but you would have to provide the original date
//with seconds as well
cal.add(Calendar.SECOND, -10);
scheduleClient.setAlarmForNotification(cal);

Calculating date certain period from now

I have a start date (day, month, year) and need the date say 4 weeks from that date. How can I calculate that? I know how to find the difference between two dates using Calendar so I assume I'm not too far from the answer... Thank you!!!
edit:
This is the final code I wound up using. It returns a String whose value is a date span formatted "MM/dd/YYYY - MM/dd/YYYY"
#SuppressLint("SimpleDateFormat")
private String getSessionDate(int position) {
MySession ms = mSessionList.get(position);
SimpleDateFormat format = new SimpleDateFormat("MM/dd/yyyy");
Calendar calendar = Calendar.getInstance();
calendar.set(ms.getStartYear(), ms.getStartMonth(), ms.getStartDay());
Date startDate = calendar.getTime();
String durationString = ms.getDurationString(); // Format is "## weeks"
int i = 0;
while (Character.isDigit(durationString.charAt(i))) {
i++;
}
int weeks = Integer.parseInt(durationString.substring(0, i));
calendar.add(Calendar.WEEK_OF_YEAR, weeks);
return (format.format(startDate) + " - " + format.format(calendar.getTime()));
}

You can use Calender instance for that.
Calendar calendar = Calendar.getInstance();
calendar.setTime(currentdate);
calendar.add(Calendar.DAY_OF_YEAR, no_of_days)
Date newDate = calendar.getTime();
You can calculate the date by adding or subtracting the no of days
Example :
Get date after 1 week
calendar.add(Calendar.DAY_OF_YEAR, 7);
Get date before 1 week
calendar.add(Calendar.DAY_OF_YEAR, -7);

Date date=null;
SimpleDateFormat originalFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
try {
date = originalFormat.parse(strDate); // strDate is your date from which you want to get date after 4 weeks
} catch (Exception e) {
e.printStackTrace();
}
long timeFor4week=4*7*24 * 60 * 60 * 1000; /// here 24*60*60*1000 =24 hours i.e 1 day
long timeAfter4week=date.getTime()+timeFor4week;
String finalDateString=originalFormat.format(new Date(timeAfter4week));
So you can get day after 4 weeks.

Date displaying incorrect in Android

I am developing an application in that when time is 11:26 it is showing 11:07. I used Calendar instance to do.
Calendar currentDate=Calendar.getInstance();
SimpleDateFormat ddMMyyyy=new SimpleDateFormat("dd/MM/yyyy");
datenow=ddMMyyyy.format(currentDate.getTime());
if(currentDate.get(Calendar.AM_PM)==Calendar.PM){
timenow=currentDate.get(Calendar.HOUR)+":"+currentDate.get(Calendar.MONTH)+":PM";
}else{
timenow=currentDate.get(Calendar.HOUR)+":"+currentDate.get(Calendar.MONTH)+":AM";
}
new MyToast(this, "Date = "+datenow+" time = "+timenow);
The out put is wrong what to do?

you are displaying month in place of minute. Change your code to my code
Calendar currentDate=Calendar.getInstance();
SimpleDateFormat ddMMyyyy=new SimpleDateFormat("dd/MM/yyyy");
String datenow = ddMMyyyy.format(currentDate.getTime());
String timenow;
if(currentDate.get(Calendar.AM_PM)==Calendar.PM){
timenow=currentDate.get(Calendar.HOUR)+":"+currentDate.get(Calendar.MINUTE)+":PM";
}else{
timenow=currentDate.get(Calendar.HOUR)+":"+currentDate.get(Calendar.MINUTE)+":AM";
}
Toast.makeText(MainActivity.this, "Date = "+datenow+" time = "+timenow,Toast.LENGTH_SHORT).show();
11:07 is displaying because 07 ==> month number in a year. month will be calculated from 0 -> 11

You have mistaken see here Calendar.HOUR + : + Calendar.MONTH. It should be as follows,
Calendar currentDate=Calendar.getInstance();
SimpleDateFormat ddMMyyyy=new SimpleDateFormat("dd/MM/yyyy");
datenow=ddMMyyyy.format(currentDate.getTime());
if(currentDate.get(Calendar.AM_PM)==Calendar.PM){
timenow=currentDate.get(Calendar.HOUR)+":"+currentDate.get(Calendar.MINUTE)+":PM";
}else{
timenow=currentDate.get(Calendar.HOUR)+":"+currentDate.get(Calendar.MINUTE)+":AM";
}
new MyToast(this, "Date = "+datenow+" time = "+timenow);
Instead of MINUTE you were accessing MONTH object of Calendar Class.