Develop Reference

4-4-5 Calendar approach based on Java 8 Code

For my Fiscal Calendar in Power BI I am currently trying to implement the 4-4-5 approach.
Our calendar works with 4-4-5 week quarters. Since this only has 364 days each year, there must be a 53 week year after a few years. As a result, December has 6 instead of 5 weeks.
Unfortunately, there is still no approach based on DAX.
In another post here, however, I found a JAVA code, which probably determines whether the year has 53 weeks or not:
calculate number of weeks in a given year
private static long getNumberOfWeeksInYear(LocalDate date) {
LocalDate middleOfYear = date.withDayOfMonth(1).withMonth(6);
return middleOfYear.range(WeekFields.ISO.weekOfWeekBasedYear()).getMaximum();
}
public static void main(String[] args) {
for (int year = 2000; year < 2400; year++) {
long numberOfWeeks = getNumberOfWeeksInYear(LocalDate.of(year, 1, 1));
if (numberOfWeeks != 52) {
System.out.println(year + " has " + numberOfWeeks + " weeks");
}
}
}
Do any of you know how to translate the code into Dax?
Our Fiscal Calendar starts not based on the gregorian calendar.
This year starts at 30.12.19 and ends 03.01.21. This year has 53 weeks.

I cannot help with PowerPivot and DAX. But I can tell you how to get those information usingExcel formulas.
Given the year in A2 you can calculate the Monday of the first ISO calendar week in that year using following formula:
=DATE($A2,1,1)-WEEKDAY(DATE($A2,1,1),3)+(ISOWEEKNUM(DATE($A2,1,1)-WEEKDAY(DATE($A2,1,1),3))<>1)*7
You can calculate the Sunday of the last ISO calendar week in that year using following formula:
=DATE($A2+1,1,1)-WEEKDAY(DATE($A2+1,1,1),3)+(ISOWEEKNUM(DATE($A2+1,1,1)-WEEKDAY(DATE($A2+1,1,1),3))<>1)*7-1
Given the Sunday of the last ISO calendar week placed in C2, following formula calculates the number of ISO weeks of that year:
=ISOWEEKNUM($C2)
Example:
As you see, the years are from A2 downwards. Formula to calculate the Monday of the first ISO calendar week is placed in B2 downwards. Formula to calculate the Sunday of the last ISO calendar week is in C2 downwards. And the formula to calculate the number of ISO weeks of that year is in D2 downwards.

Why there is a difference between GregorianCalendar.getTimeInMillis() and GregorianCalendargetTimeInMillis(1970.01.01)) [duplicate]

This question already has answers here:
How do I calculate someone's age in Java?
(28 answers)
Why is January month 0 in Java Calendar?
(18 answers)
Closed 3 years ago.
I have tried to compare to Dates the Birthdate and the Current date
and then I tried to get the age.
But the Current date Funtion begins with another Date than the given date
My Code:
GregorianCalendar birthdate = new GregorianCalendar(2001,06,20);
long ms = System.currentTimeMillis() - birthdate.getTimeInMillis();
double years = (((double)ms / 1000)/31536000) ;
System.out.print(years);
// years Shoud be 18 here but it returns 17.3
if (years > 18) {
// Code Block
}
else{
System.out.print("to Jung");
}

Check the Constructor on GregorianCalendar.
public GregorianCalendar(int year,
int month,
int dayOfMonth)
Constructs a GregorianCalendar with the given date set in the default time zone with the default locale.
year - the value used to set the YEAR calendar field in the calendar.
month - the value used to set the MONTH calendar field in the calendar. Month value is 0-based. e.g., 0 for January.
dayOfMonth - the value used to set the DAY_OF_MONTH calendar field in the calendar.
You are creating a July 20th date, which is coincidentally offset by a single month, or approximately 0.08 years.

LocalDate birthdate = LocalDate.of(2001,06,20);
LocalDate currentdate = LocalDate.now();
int years = Period.between(birthdate , currentdate).getYears();
if (years >= 18) {
// Code
} else {
System.out.print("Sie sind zu Jung");
}
It Worked like this but I must change the hole code because everything was written with the GeorgianCalender.

I couldn't tell you why exactly your code, which should technically work, doesn't: there seems to be inaccuracies (leap days?) in the Calendar, or I'm missing something. Thanks to Compass, I know that I was missing something: months are 0-indexed in the constructor for Gregorian Calendar. 06 is July.
However, you shouldn't compare dates like this. If you don't want to use any other library, you can do this:
GregorianCalendar birthdate = new GregorianCalendar(2001,06,20);
GregorianCalendar today = new GregorianCalendar();
birthdate.add(Calendar.YEAR, 18);
System.out.print(birthdate.getTime().after(today.getTime()));

get number of the week in the year where first day of the week is Sunday

I'm trying to get the number of the week for a date , In my country the week begins on Sunday so the week number of 6/5/2016 is 23 but it returning 22 because the ISO week in JAVA starts from Monday , I have used the following methods but it's not working
mCalendar = Calendar.getInstance();
int weekNum = mCalendar.get(Calendar.WEEK_OF_YEAR); //returns 22 I need 23
// I have tried the following method but it has no effect
mCalendar.setFirstDayOfWeek(Calendar.SUNDAY);
note that I can't use the Time Class I can only use Java 7

Java 8 version full answer:
public<T extends Temporal> long getWeekNumber(T tObj) {
DayOfWeek firstDayOfWeek = DayOfWeek.SUNDAY; // set your
Temporal firstDayOfThisYear = tObj.with(TemporalAdjusters.firstDayOfYear());
Temporal firstDayOfWeekInMonth = firstDayOfThisYear
.with(TemporalAdjusters.dayOfWeekInMonth(1, firstDayOfWeek));
return ChronoUnit.WEEKS.between(tObj, firstDayOfWeekInMonth);
}
The parameter can be any Temporal type, even the Temporal itself.

I don't know from where you are but Java has an awesome Calendar which allows the following:
Calendar calendar = Calendar.getInstance(Locale.TRADITIONAL_CHINESE);
int weekNumber = calendar.get(Calendar.WEEK_OF_YEAR);
System.out.println("Number of week: " + weekNumber);
// produces 24
Calendar calendar = Calendar.getInstance(Locale.UK);
int weekNumber = calendar.get(Calendar.WEEK_OF_YEAR);
System.out.println("Number of week: " + weekNumber);
// produces 22
You could use the locale constants to specify your location and i think you will get the right number of weeks.
Edit:
Now I see the failure in your code. Please note that Java works from the top to the button of your code:
Calendar calendar = Calendar.getInstance();
// First set the first day of the week ...
calendar.setFirstDayOfWeek(Calendar.SUNDAY);
// ... and than you could ask the calendar for the week
int weekNumber = calendar.get(Calendar.WEEK_OF_YEAR);
// will produce 23
System.out.println("Number of week: " + weekNumber);

I don't know where you are from.
I'm french and that works perfectly this way :
Calendar mCalendar = Calendar.getInstance(Locale.FRANCE);
mCalendar.setFirstDayOfWeek(Calendar.SUNDAY);
int weekNum = mCalendar.get(Calendar.WEEK_OF_YEAR);
System.out.println(weekNum); // --> 23

Get the current moment.See this Question: How to initialize a variable of type date in Java?
Determine the first Sunday of the year.Handled thoroughly in this question: How to get all the Sunday's of a year
Count weeks between that first Sunday and current moment.See the Question: Get the number of weeks between two Dates

I've just figured out how to change it
you need to set up two things
1-first day of the week
2-the minimal day of week
setFirstDayOfWeek(Calendar.SUNDAY);
setMinimalDaysInFirstWeek(7);
this will tell the calendar to make the fist day is sunday and with 7 days minimal week

Im trying to calculate the number off days between 2 date objects [duplicate]

This question already has answers here:
Calculating the difference between two Java date instances
(45 answers)
Closed 8 years ago.
public static int countWeeks() {
// setting dates
Calendar calStart = GregorianCalendar.getInstance();
calStart.set(2014, 8, 30);
Date dateStart = calStart.getTime();
Date dateEnd = new Date();
// count days and weeks
int diffInDays = Days.daysBetween(new DateTime(dateStart), new DateTime(dateEnd)).getDays(); // int weekNumber = (int) diffInDays / 7;
return weekNumber;
}
I'm trying to calculate the number of days and weeks between today and last week but I always get -3 as weekNumber. I have no idea what i'm doing wrong.
Thanks in advance.

First, I will assume that
int weekNumber = (int) diffInDays / 7;
is not commented since otherwise you would get a compilation error.
Now, as explained in my comment, by doing
calStart.set(2014, 8, 30);
You are setting the date at the end of setember, not of august. So, it is 3 weeks ahead of now, so you get a -3. Use the Calendar constants.
calStart.set(2014, Calendar.AUGUST, 30);

You set the startdate to Sep. 30th because te month is zero bases!
See the documentation from java.util.Calendar:
public final void set(int year,
int month,
int date) Sets the values for the calendar fields YEAR, MONTH, and DAY_OF_MONTH. Previous values of other calendar fields are
retained. If this is not desired, call clear() first. Parameters: year
- the value used to set the YEAR calendar field. month - the value used to set the MONTH calendar field. Month value is 0-based. e.g., 0
for January. date - the value used to set the DAY_OF_MONTH calendar
field. See Also:

You are getting -3 as the weeknumber since you have commented that out so it showing some random value. Also note that 8 shows the September month not Aug since months are 0 based.
So if you are aiming at August month then you may try this:
calStart.set(2014, 7, 30);
^^-- This represents August month

If you are on Java 8 you can use the Java time API:
LocalDate start = LocalDate.of(2014, 8, 30);
LocalDate end = LocalDate.now();
long days = ChronoUnit.DAYS.between(start, end);
return (int) days / 7;

JCalendar save date to different variables [duplicate]

I have a 3D array that contains 38 years, 12 months, and 31 entries for each month (regardless of how many days in that month). Like so: array[38][12][31]. I also have a JCalendar that is doing nothing now except looking pretty, and the JCalendar has a button underneath. How would I make it so that I can select a date in the calendar, then press the button and it returns the element of my array that would correspond to that date?
Something like
if(buttonPressed){
year = chosenYear - 1975;
month = chosenMonth;
day = chosenDay;
System.out.print(array[year][month][day]);
}
thanks guys.

You can get the selected Date in a PropertyChangeListener, as shown here. Once you have the date, you can get the year, month and day from a Calendar:
Calendar c = Calendar.getInstance();
c.setTime(date);
int y = c.get(Calendar.YEAR);
int m = c.get(Calendar.MONTH);
int d = c.get(Calendar.DAY_OF_MONTH);
Calendar.MONTH is already zero-based, but Calendar.DAY_OF_MONTH is not; and you'll need to adjust the year to your baseline.