We Keep Coding

MS Project showing incorrect start date and enddate

I'm using mpxj 4.5 to export ms project. When i open mpx file by ms project, I'm getting incorrect start date and finish date, but it's calculating duration correctly. What am i doing wrong, please tell.
To create mpx task I use following parametrs of mpxj:
public ProjectFile exportToMSProject(Integer projectID){
file.setAutoTaskID(true);
...........
}
private void createMSProjectTask(ProjectFile file, EUser user, ETask eTask)
Task task = file.addTask();
task.setUniqueID(eTask.getObjectID());
task.setName(eTask.getName());
task.setNotes(eTask.getDescription());
task.setType(TaskType.FIXED_DURATION);
long workTime = 0;
if(eTask.getDueDate() != null && eTask.getStartDate() != null){
workTime = (eTask.getDueDate().getTime() - eTask.getStartDate().getTime()) / (1000 * 60 * 60);
}
if(eTask.isAllDay()){
task.setDuration(Duration.getInstance(workTime / 24, TimeUnit.DAYS));
}else {
task.setDuration(Duration.getInstance(workTime, TimeUnit.HOURS));
}
if(eTask.getStartDate() != null)
task.setStart(user.getUserDate(eTask.getStartDate())); //get time from user time zone
if(eTask.getDueDate() != null)
task.setFinish(user.getUserDate(eTask.getDueDate()));
task.setPercentageComplete(eTask.getPercent() != null ? eTask.getPercent() : new Float(0.0));
if(eTask.getActualStartDate() != null)
task.setActualStart(eTask.getActualStartDate());
}
I'm getting repeatedly startdate and incorrect enddate. What is the problem here? Any suggestion will be appreciated.

I had the same issue. From my point of view, if you not have any predecessor or actual start date of your tasks, mpxj sets startdate automatically, I mean, it gets startdate from your project header or first task's start date of your project. That's why you got repeated startdate.
Here is the simple example (I'm using mpxj 4,5 and creating .mpx file):
SimpleDateFormat df = new SimpleDateFormat("dd/MM/yyyy");
ProjectFile file = new ProjectFile();
ProjectHeader header = file.getProjectHeader();
header.setStartDate(df.parse("01/05/2014"));
Task task1 = file.addTask();
task1.setName("Summary Task");
Task task2 = task1.addTask();
task2.setName("First Sub Task");
task2.setDuration(Duration.getInstance(10.5, TimeUnit.HOURS));
task2.setStart(df.parse("01/05/2014"));
task2.setPercentageComplete(NumberUtility.getDouble(50.0));
Task task3 = task1.addTask();
task3.setName("Second Sub Task");
task3.setStart(df.parse("11/05/2014"));
task3.setDuration(Duration.getInstance(10, TimeUnit.HOURS));
Task milestone1 = task1.addTask();
milestone1.setName("Milestone");
milestone1.setStart(df.parse("21/05/2014"));
milestone1.setDuration(Duration.getInstance(0, TimeUnit.HOURS));
Task task4 = file.addTask();
task4.setName("Last Task");
task4.setDuration(Duration.getInstance(8, TimeUnit.HOURS));
task4.setStart(df.parse("02/05/2014"));
task4.setPercentageComplete(NumberUtility.getDouble(70.0));
ProjectWriter writer = getWriter(filename);
writer.write(file, filename);
As you have seen, I'm not giving any predecessor or actual start date. If you run this you will get following result.
In order to get start date correctly, i gave an actual startdate not a startdate, and it worked. In addition if you have predecessor, you will get parent task's due date as a startdate.
task.setActualStart(df.parse("02/05/2014"));
By the way, ms project sets due date based on your duration.

how to get client's time zone in java from HttpServletRequest? [duplicate]

This question already has answers here:
How to detect the timezone of a client?
(4 answers)
Closed 5 years ago.
When server and client are in different time zones, can i get client's time zone in java using HttpServletRequest?
I am trying to create an instance of 'Calender' using client's 'Locale' like this,
Calendar calendar = Calendar.getInstance(request.getLocale());
TimeZone clientTimeZone = calendar.getTimeZone();
But this is giving me Server's time zone only.
Is this method wrong?
Is there any other way to get Client's time zone in Server?

Unfortunately the time zone information's are not passed in HTTP request.
But there are a work around for this case.
Check this answer and this one. it may help you.

there are 2 ways we get browser's timezone from request object.
when you are making request from the browser add an parameter to request object using javascript. The below command gives browser's timezone:
Intl.DateTimeFormat().resolvedOptions().timeZone
using this command you will get an string representing timezone example "Pacific/Fakaofo,Pacific/Honolulu" you can get this time zone out of request object on server side using
String timezoneStr = request.getParameter("your_parameter_name");
passing this string to Timezone.getTimeZone(timezoneStr); will return timezone object for browser's time
Another way of doing so is get the zoneOffset from the request session. Session contains zoneOffset value in integer form you need to get your GMT time out of that. below is the sample:
public static String getGMTSignedZone(HttpServletRequest request)
{
String zoneOffset;
HttpSession session = request.getSession();
zoneOffset = (String)session.getAttribute("timezone");
if(zoneOffset != null && !zoneOffset.equals(""))
{
Integer zMinutes = Integer.valueOf(zoneOffset);
String sign = (zMinutes < 0) ? "+" : "-";
String hourString;
String minString;
if(zMinutes < 0)
{
zMinutes = zMinutes*(-1);
}
// hours 0 to 23
int hours = zMinutes/60;
if(hours > 23)
{
hours = hours/24;
}
if(hours < 10)
{
hourString = "0" + hours;
}
else
{
hourString = "" + hours;
}
//minute conversion
int minutes = zMinutes - (hours*60);
if(minutes < 10)
{
minString = "0" + minutes;
}
else
{
minString = "" + minutes;
}
return ("GMT" + sign + hourString + minString);
}
return zoneOffset;
}
return of above can be easily converted into Timezone using below code:
StringBuffer buffer = new StringBuffer("");
int absOffset = Math.abs(offset);
int hrs = absOffset/60;
int mins = absOffset%60;
buffer.append("GMT").append(offset > 0 ? "-" : "+").append(hrs < 10 ? "0" : "").append(hrs).append(":").append(mins < 10 ? "0" : "").append(mins);
String tzID = buffer.toString();
TimeZone tz = TimeZone.getTimeZone(tzID);
use any of these method's to get timezone and convert your calender object to defined timezone.
out of both the methods seconds dosen't requires any client side code but a lot of validation on server side, and first approach requires small changes on client side and small changes on server side. It is up to you what you prefer.

Convert Minutes to milliseconds Java/android

I am trying to convert given number of minutes into milliseconds.
For eg: 15mins or 20mins or 44mins should be converted to milliseconds programmatically.
I tried the below:
Calendar alarmCalendar = Calendar.getInstance();
alarmCalendar.set(Calendar.MINUTE,15);
long alarmTime = alarmCalendar.getTimeInMillis();
Log.e("Milli", "seconds"+alarmTime);
This doesn't give the right value? What is the best way to convert this?

TimeUnit.MINUTES.toMillis(yourMinutes)
see TimeUnit javadoc (android)

int minutes = 42;
long millis = minutes * 60 * 1000;

1 minute = 60000 millisecs.
int minutes = 1;
long milliseconds = minutes * 60000;

In Java 8+, use java.time.
java.time.Duration.ofMinutes(15).toMillis();

This answer is in reference to Android using Kotlin-
So if you are using MaterialTimePicker or TimePicker then you can get the hours and minutes values stored in the picker. Then use TimeUnit.HOURS.toMillis(picker.hour.toLong()) and TimeUnit.MINUTES.toMillis(picker.minutes.toLong()) to convert the received time to milliseconds and then add both the values to get the total time in Milliseconds which you can further use to store in Room Database for entering time and fetching when required.
Code for reference :
binding.timeStart.setOnClickListener {
openTimePicker()
picker.addOnPositiveButtonClickListener {
val h = picker.hour
val m = picker.minute
binding.timeStart.text = "$h:$m"
Timber.d("Start Time - $h: $m")
try {
val hour = TimeUnit.HOURS.toMillis(h.toLong())
val minute = TimeUnit.MINUTES.toMillis(m.toLong())
val totalTime = hour + minute
Timber.d("Hour - $hour, Minute - $minute, Total = $totalTime")
timeStart = totalTime
} catch (e: Exception) {
Timber.d("$e")
}
}
}
private fun openTimePicker() {
picker = MaterialTimePicker.Builder()
.setTimeFormat(TimeFormat.CLOCK_12H)
.setHour(12)
.setMinute(10)
.setTitleText("Set Start Time")
.build()
picker.show(childFragmentManager, "TAG")
}

This gives you the time in milli.
long currentTime = System.currentTimeMillis()
Handler handler = new Handler();
long waitTime = currentTime + (15*60*1000);
handler.postDelayed(new Runnable() {
public void run() {
// Alert or do something here.
}
}, waitTime);
This piece of code sleeps for 15 minutes and then executes the handler's run method. This way you can raise an alarm etc...

Java7 GregorianCalendar timeInMillis from collection are not working well

I need to record a collection of objects that keep: Date, and average Day temperature.
and I need to be able to track back the date.
So I created a class that keeps these values and I made an ArrayList that keeps these objects.
In my code I test to keep 5 days. When I run the program and the ArrayList gets filled everything seems fine and the terminal displays:
dateSaved:2013-10-16 11:59:59 TimeStamp: 1381960799018
dateSaved:2013-10-17 11:59:59 TimeStamp: 1382047199018
dateSaved:2013-10-18 11:59:59 TimeStamp: 1382133599018
dateSaved:2013-10-19 11:59:59 TimeStamp: 1382219999018
These TimeStamps are all unique and seem to be fine.
however when I then enter the for loop and want to get the timestamps from each of these entries I get:
entry: 0 //removed since the first dateSaved has not been pasted*
entry: 1 timeInMillis: 1382306399018
entry: 2 timeInMillis: 1382306399018
entry: 3 timeInMillis: 1382306399018
entry: 4 timeInMillis: 1382306399018
These are all the same times and are: Sun, 20 Oct 2013 21:59:59 GMT
That is the date here. but not the time. And i'm not realy getting the values I expect to get.
What is going wrong here?
GregorianCalendar date = new GregorianCalendar();
GregorianCalendar beginDate = new GregorianCalendar();
beginDate.roll(beginDate.DAY_OF_YEAR ,-5);
while(beginDate.getTimeInMillis() < date.getTimeInMillis() )
{
GCalAndDouble dateAndTemp = new GCalAndDouble(beginDate, WeatherStation.Instance().getValue(Enums.MeasurementType.outsideTemperature, Enums.ValueType.average, beginDate) );
list.add(dateAndTemp);
System.out.println("dateSaved:" + new SimpleDateFormat("YYYY-MM-dd KK:mm:ss").format(new Timestamp(beginDate.getTimeInMillis())) + " TimeStamp: " + beginDate.getTimeInMillis() );
long timeTemp = beginDate.getTimeInMillis();
beginDate.setTimeInMillis(timeTemp + 86400000); // + the ammount of milliseconds in a day.
}
for(int j = 0; j < 5; j++)
{
GCalAndDouble tempdateandtemp = list.get(j);
long timestamptemp = tempdateandtemp.getDate().getTimeInMillis();
System.out.println("entry: " + j + " timeInMillis: " + timestamptemp);
}
Thanks for your help!

You are using the same beginDate object. This means that all the values will be the same. They might have changed as you were building the list, but the final value is all you will see.
Most likely you intended to create a new Date() object for each entry to give each one a different Date. BTW I prefer to use long which is not only more efficient but doesn't have this issue.

Halting program execution between certain hours of the week

I am writing a Java program that is required to copy files and folders between the following hours:
Mon - 18:00 to 06:30
Tue - 18:00 to 06:30
Wed - 18:00 to 06:30
Thu - 18:00 to 06:30
Fri - 18:00 to 06:30
Sat - all day
Sun - all day
The program will run continuously until it has finished copying all files and folders. However, outside of the above hours the program should just sleep.
I am using a properties file to store the above settings.
UPDATE
I am looking for the simplest possible implementation including the format of the properties in the properties file as well as the code that will make the checks.

I would do it like this
final Map<Integer, String> schedule = new HashMap<>();
// parse your settings and fill schedule
schedule.put(Calendar.MONDAY, "18:00 to 06:30");
// ...
// create timer to fire e.g. every hour
new Timer().scheduleAtFixedRate(new TimerTask() {
public void run() {
Calendar c = Calendar.getInstance();
String s = schedule.get(c.get(Calendar.DAY_OF_WEEK));
if (withinTimeRange(c, s)) { // implement withinTimeRange func
// copy files
}
}}, 0, 1000 * 3600);

Since your program is going to run continuously, the simplest solution is to check the day and time before copying a file. If the time is during off hours, go ahead and copy the next file, otherwise Thread.sleep.
If this is an internal, one-off kind of program, I would go ahead and hard-code the business hours instead of reading the properties file. No need to add complexity.

whenever your program is launched, get the current time, and check day today's day.
check whether it lies in permissible time if yes let it continue. If not, find the time at 00:00am of that 'day'. and find the time at xx:yyZZ (start of permissible time). calculate the difference, and let the program sleep for that much of time.

Thank you for your suggestions.
I came up with a working solution in the end which if it gets enough points I will mark as the answer. The way I attempted to solve this problem was by thinking about non-working hours rather than working hours. This code is just for illustration
# Properties
Mon = 06:30-18:00
Tue = 06:30-18:00
Wed = 06:30-18:00
Thu = 06:30-18:00
Fri = 06:30-18:00
Loop over the properties to get their values
String[] days = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
Map<Integer, Integer[]> nonWorkingHours = new HashMap<Integer, Integer[]>();
for( int i = 0; i < days.length; i++ ) // for each property in file
{
// excluded implementation of getConfig
String prop = getConfig( days[ i ] ); // e.g. "06:00-19:00"
// +1 to match CALENDAR.DAY_OF_WEEK
nonWorkingHours.put( i + 1, getHours( prop );
}
My function to parse property excluding error handling
// e.g. if prop = "06:00-19:00" then { 6, 0, 19, 0 } is returned
public Integer[] getHours( String prop )
{
String times = prop.split( "(:|-)" );
Integer[] t = new Integer[4];
for( int i = 0; i < times.length; i++ )
{
t[i] = Integer.parseInt( times[i] );
}
return t;
}
And finally the function that implements the halt
private void sleepIfOutsideWorkingHours()
{
Integer[] data = nonWorkingHours.get( currentDay );
if( data != null )
{
Calendar c = Calendar.getInstance();
Integer currentSeconds = ( Calendar.HOUR_OF_DAY * 3600 ) + ( Calendar.MINUTE * 60 );
Integer stopFrom = ( data[ 0 ] * 3600 ) + ( data[ 1 ] * 60 );
Integer stopTill = ( data[ 2 ] * 3600 ) + ( data[ 3 ] * 60 );
if( currentSeconds > stopFrom && currentSeconds < stopTill )
{
Integer secondsDiff = stopTill - currentSeconds;
if( secondsDiff > 0 )
{
try
{
Thread.sleep( secondsDiff * 1000 ); // turn seconds to milliseconds
}
catch( InterruptedException e )
{
// error handling
}
}
}
}
}
And finally just call the function below just before copying each file and if it is being run outside working hours it will stop the program.
sleepIfOutsideWorkingHours();
I am sure there is a simpler way of doing it :-) but there it is.

You should try using a Continuous Integration system. That scenario can be easily set up using Jenkins CI for example.
The reason i advise doing it so in a ambient like that is that you can keep a better control on the history of your program runs.