Develop Reference

Calculate Time difference between 2 given timestamps only considering day time of the day in Android?

I've to 2 different epoch timestamp A and B. For each day i have different sunrise and sunset times.
Suppose for day 1, which is timestamp A day sunrise time is 6.00 am and sun set time as 6.30 pm and for day2, sunrise time is 6.05 am and sunset time is 6.25pm, etc., below is the format i have,
val sunRise = mapOf<Int,String>(1 to "6.00", 2 to "6.05",3 to "6.01", 4 to "6.06")
val sunSet = mapOf<Int,String>(1 to "18.30", 2 to "18.25",3 to "18.20", 4 to "18.23")
val startTime = 1579919400000
val endTime = 1580203800000
Now how to calculate time taken between these to timestamps which are only between sunRise and sunSet in Android

Try Below method will calculate difference between two times.
System.out.println("==result==: " + stringForTime(endTime - startTime));
public String stringForTime(long timeMs) {
long totalSeconds = timeMs / 1000;
long seconds = totalSeconds % 60;
long minutes = (totalSeconds / 60) % 60;
long hours = totalSeconds / 3600;
Formatter mFormatter = new Formatter();
if (hours > 0) {
return mFormatter.format("%02d:%02d:%02d", hours, minutes, seconds).toString();
} else {
return mFormatter.format("%02d:%02d", minutes, seconds).toString();
}
}

Android SDK MediaPlayer doesn't seek correctly

I have a mp3 file and my application must seek to some selected time of that mp3 file then start playing from there.
I convert my string time by this method to int value
private static int convert(String time) {
int quoteInd = time.indexOf(":");
int pointInd = time.indexOf(".");
int min = Integer.valueOf(time.substring(0, quoteInd));
int sec = Integer.valueOf(time.substring(++quoteInd, pointInd));
int mil = Integer.valueOf(time.substring(++pointInd, time.length()));
return (((min * 60) + sec) * 1000) + mil;
}
Note: my stings is like this 5:12.201 that means 5 mins and 12 seconds and 201 milliseconds.
I getted these times from MP3 Audio Editor application (it's for windows) and I checked theme with KMPlayer application (it's for windows). And these times was correct on both of them.
But in my app when I seek my MediaPlayer to that time, audio doesn't start from my selected position. (time is correct but sound is different.)
I thought that the MediaPlayer doesn't seek to that time correctly. So I checked current position by calling getCurrentPosition() before playing but returned value and seeked value was same.
I haven't any Idea about It.
Edit:
My problem is NOT time converting.
I convert and seek to there correctly but it play something that not expected in that time.
It means timing in KMPlayer and Android are differents.
My question is Way? and How can is solve it?

You must seek using the seekTo method. This expects miliseconds as time offset. Your offset is how far from the beginning you want to play, for example 1 minute from start can be your offset.
Note: my strings is like this 5:12.201 (Mins : Secs : Millisecs)
If you want to seek to a time like 5:12.201 then use seekTo(312201);
Explained :
1000 ms gives you one second, so 12000 is 12 seconds, and 60000 is one minute.
If you want 5m:12s time then do as :
MyMins = 1000 * 60 * 5; //# 5 mins at 60 secs per minute
MySecs = 1000 * 12; //# 12 secs
MyMilliSecs = 201; //# 201 millisecs
SeekValue = (MyMins + MySecs + MyMilliSecs);
seekTo(SeekValue); //# seeks to 312201 millisecs (is == 5 min & 12 secs & 201 ms)

I usually use this function.
I think It can help to you.
public static String milliSecondsToTimer(long milliseconds){
String finalTimerString = "";
String secondsString = "";
int hours = (int)( milliseconds / (1000*60*60));
int minutes = (int)(milliseconds % (1000*60*60)) / (1000*60);
int seconds = (int) ((milliseconds % (1000*60*60)) % (1000*60) / 1000);
if(hours > 0){
finalTimerString = hours + ":";
}
if(seconds < 10){
secondsString = "0" + seconds;
}else{
secondsString = "" + seconds;}
finalTimerString = finalTimerString + minutes + ":" + secondsString;
return finalTimerString;
}
Good luck :)

Getting Time Until a Date in Android

I am using a Date and Time Dialog to get a Date and Time for an Event Specifed by the User. That data is the Converted by doing the following:
int yearE = Integer.valueOf(evntDate.split("/")[2]);
int monthE = Integer.valueOf(evntDate.split("/")[1]);
int dayE = Integer.valueOf(evntDate.split("/")[0]);
int hour = Integer.valueOf(evntTm.split(":")[0]);
int min = Integer.valueOf(evntTm.split(":")[1]);
With the Values of:
eventDate = "3/5/2015";
eventTime = "13:2";
I then get that data and COnvert it into Milliseconds and Store that in the Database:
newCalendar.set(yearE, monthE, dayE,hour, min, 0);
startTime = newCalendar.getTimeInMillis();
...
When I load the Info from the Database, I try to calculate the amount of time left until the Specified date. So I do the following:
Long timeL = Long.valueOf(time);
Calendar eventDay = Calendar.getInstance();
eventDay.setTimeInMillis(timeL);
Calendar today = Calendar.getInstance();
long diff = eventDay.getTimeInMillis() - today.getTimeInMillis();
// CONVERT:
int seconds = (int) TimeUnit.MILLISECONDS.toSeconds(diff);
int minutes = (int) TimeUnit.MILLISECONDS.toMinutes(diff);
int hours = (int) TimeUnit.MILLISECONDS.toHours(diff);
int days = (int) TimeUnit.MILLISECONDS.toDays(diff);
...
When I log the above data, the days are usually around 30-32 and the rest of the data is incorrect as well. What am I doing wrong? Or what are some alternatives?

Consider using the Joda time library instead of Calendar, it's much easier to work with.
As you're on android, I'll assume that you're using gradle, so go ahead and drop this in your dependencies
compile 'joda-time:joda-time:2.3'
I've created a small psvm to demo how you can use it
import org.joda.time.DateTime;
import org.joda.time.Period;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.PeriodFormat;
import static java.lang.String.format;
public class DateTimeDemo {
public static void main(String[] args) {
// Your date/time values, I'll assume you missed a digit off the time ;)
String eventDate = "3/5/2015";
String eventTime = "13:20";
// convert these to a DateTime object
DateTime targetDateTime = DateTime.parse(format("%s %s", eventDate, eventTime), DateTimeFormat.forPattern("dd/MM/yyyy HH:mm"));
// print out the millis, or in your case, save it to DB
System.out.println("targetDateTime in millis is " + targetDateTime.getMillis());
// grab a timestamp
DateTime now = DateTime.now();
// print it out, just for demo
System.out.println("millis for now is " + now.getMillis());
// create a period object between the two
Period period = new Period(now, targetDateTime);
// print out each part
System.out.println("seconds " + period.getSeconds());
System.out.println("hours " + period.getHours());
System.out.println("months " + period.getMonths());
// convert the period to a printable String
String prettyPeriod = PeriodFormat.getDefault().print(period);
// write it out!
System.out.println(prettyPeriod);
}
}
Output is
targetDateTime in millis is 1430623200000
millis for now is 1425527593584
seconds 46
hours 22
months 1
1 month, 3 weeks, 6 days, 22 hours, 26 minutes, 46 seconds and 416 milliseconds

You can use Joda for that.
long dbTime = 1425525415837L;
Period period = new Period( dbTime, System.currentTimeMillis() );
String formatted = PeriodFormat.getDefault().print(period);
System.out.println( formatted );
If you want more control of the format use PeriodFormatter.
If you want to get the seconds, minutes, hours, etc. and not just print them, you can use the various available methods. For example:
period.getSeconds();
period.getHours();
period.getMonths();
More formatting options are described in this question.

Are you expecting to see something similar:
seconds = 36 (always less than 60)
minutes = 12 (always less that 60)
hours = 17 (always less than 24)
days = 45 (always less that 31 if # of months is used, else < 366 if # of years is used)
...
...
from:
// CONVERT:
int seconds = (int) TimeUnit.MILLISECONDS.toSeconds(diff);
int minutes = (int) TimeUnit.MILLISECONDS.toMinutes(diff);
int hours = (int) TimeUnit.MILLISECONDS.toHours(diff);
int days = (int) TimeUnit.MILLISECONDS.toDays(diff);
Its a logical error then. TimeUnit.MILLISECONDS.toXXXX(long) converts the whole time-difference into the specified units. This is of no value to you.
As an example, say you set the event's date to 32 days from now - and time to 13:15.
Millisecond difference =
2764800000 (32 days in millis)
+ 46800000 (13 hours in millis)
+ 900000 (15 minutes in millis)
= 2812500000
Using this time-difference, the following log:
int seconds = (int) TimeUnit.MILLISECONDS.toSeconds(diff);
int minutes = (int) TimeUnit.MILLISECONDS.toMinutes(diff);
int hours = (int) TimeUnit.MILLISECONDS.toHours(diff);
int days = (int) TimeUnit.MILLISECONDS.toDays(diff);
produces:
Seconds left: 2812500
Minutes left: 46875
Hours left: 781
Days left: 32
These figures are not off. A quick check would be: time difference in millis was: 2812500000 => in seconds would be diff/1000 = 2812500 => in minutes would be => diff/1000/60 = 46875 and so on.
Relative time:
To get relative time such as 32 days, 13 hours and 15 minutes left, you will have to do the heavy-lifting yourself. As an example:
// I will use the actual values instead of defined
// variables to make this easier to follow
long timeDiff = 2812500000L;
// Simple division // we don't care about the remainder
// Result: 32
int days = 2812500000 / DateUtils.DAY_IN_MILLIS;
// This is what's left over after we take the days out.
// We'll use this to get the number of hours.
// Result: 47700000
long remainderFromDays = 2812500000 % DateUtils.DAY_IN_MILLIS;
// Simple division // we don't care about the remainder
// Result: 13
int hours = 47700000 / DateUtils.HOUR_IN_MILLIS;
// This is what's left over after we take the hours out.
// We'll use this to get the number of minutes.
// Result: 900000
long remainderFromHours = 47700000 % DateUtils.HOUR_IN_MILLIS;
// Result: 15
int minutes = 900000 / DateUtils.MINUTE_IN_MILLIS;
// Result: 0
long remainderFromMinutes = 900000 % DateUtils.MINUTE_IN_MILLIS;
// Result: 0
int seconds = 0 / 1000; // 1000 ms = 1 sec
Log.i("Time-Difference", "Event in: " + String.format("Event in %d days, %d hours, %d minutes and %d seconds", days, hours, minutes, seconds));
Output:
Event in: 32 days, 13 hours, 15 minutes and 0 seconds
This is the very reason everyone here is suggesting Joda Time. The computation above is just off the top of my head. I cannot guarantee its correctness. If you also need relative month difference (such as 3 months, 2 days ....), a lot of work will be required. There isn't a DateUtils.MONTH_IN_MILLIS constant - varying number of days - 28, 29, 30, 31.
On the other hand, Joda Time is a tried & tested product. But, if all you need is one kind of computation, used scarcely (if ever), I'd say spend some time and come up with your own implementation rather than under-employ Joda Time.

Your code looks fine to me for what you are doing. Using org.joda.time as others have suggested is a best-practice, but it won't fix the problem. Instead you need to do two things:
Verify the Month that the user entered is in range (they may have entered the date in MM/DD/YYYY format). Month values greater than 12 won't throw an exception and your diff will be way off.
The line where you construct your date, subtract 1 from the month since months should be from 0 to 11, like:
newCalendar.set(yearE, monthE-1, dayE,hour, min, 0);

Calculating elapsed time between two dates, gives different results in different devices

Im trying to get the time elapsed from a specific date (in millis)
In some devices I get the correct result
however, in other devices I get wrong result
here's the code that i use:
public static void timeElapsedFromDate(long workingDate)
{
long diff = System.currentTimeMillis() - workingDate;
long diffSeconds = diff / 1000;
long diffMinutes = diffSeconds / 60;
long diffHours = diffMinutes / 60;
long diffDays = diffHours / 24;
long diffWeeks = diffDays / 7;
long diffMonth = diffDays / 30;
}
Isn't it the way to measure time?
thanks!

First of all, diffMonth formula asks to be improved: from Feb 1st to Mar 1st it is usually 28 days, but one month. From Sep 1st to Sep 31st it is 30 days, but less than 1 month.
More subtle question regarding diffDays: isn't it 1 day between 10 PM and 10 AM next morning?
Finally, how different devices can give different results: System.currenTTimeMillis() returns the difference, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC. Even if the clock on all devices is correct, they may have different Time Zone settings.

public int getElapsedTimeInDays(Date start,Date end){
int days=(int)(start.getTime()-end.getTime())/(1000*60*60*24);
return days;
}
public int getElapsedTimeInHours(Date start,Date end){
int hours=(int)(start.getTime()-end.getTime())/(1000*60*60);
return hours;
}
public int getElapsedTimeInMinutes(Date start,Date end){
int minutes=(int)(start.getTime()-end.getTime())/(1000*60);
return minutes;
}
public int getElapsedTimeInSecunds(Date start,Date end){
int scunds=(int)(start.getTime()-end.getTime())/(1000);
return secunds;
}
//Then you can use the codes like this:
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd, hh:mm");
Date start = df.parse("2012-01-12, 09:35");
Date end = new Date();//this will be the curent date;
int day = getElapsedTimeInDays(start,end);

countdown timer in android

i want to run an countdown time , in which i want to show days,hours,sec and milisec remaining for a specific date. and will be be keep changing till the end of the specific date.
Hope you can understand.
Thanks in advance.

Well, I think the problem is, that you dont know, how to work with the time. Here i have a method I use to calculate the amount of time of some items which I parse out of a db.
The param is a double value, which has got the whole time in seconds. It returns a string with the time in days, hours, minutes and seconds as string.
public String timeCalculate(double ttime) {
long days, hours, minutes, seconds;
String daysT = "", restT = "";
days = (Math.round(ttime) / 86400);
hours = (Math.round(ttime) / 3600) - (days * 24);
minutes = (Math.round(ttime) / 60) - (days * 1440) - (hours * 60);
seconds = Math.round(ttime) % 60;
if(days==1) daysT = String.format("%d day ", days);
if(days>1) daysT = String.format("%d days ", days);
restT = String.format("%02d:%02d:%02d", hours, minutes, seconds);
return daysT + restT;
}
For the countdown itself...take the target timestamp minus the actual one and voila, you've got seconds left :) Put those seconds to this method and you've got the remaining time. Now you just need to do some UI things ;)
Oh, and for the usual Unix Timestamp you can use this little method:
public static long getTimestamp() {
return System.currentTimeMillis() / 1000;
}