datetime - Is there a way to get starting date of a given weekNo of a given year Java? -

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• how first day of given week number in java 7 answers

is there way using library this.

datetime getstartingdate(string year, int weekno){     //should return starting day of given weekno of given year. } 

ex: year = 2016 weekno=1

datetime returning = 3rd jan in (sun-sat format) = 4th jan in (mon-sun format)

it seems want, starting point, first full week starts on given day of week (sunday or monday in example).

this achieved this:

import static java.time.temporal.temporaladjusters.nextorsame;  public static localdate getstartingdate(int year, int weekno, dayofweek weekstart) {   //should check arguments valid etc.   return year.of(year).atday(1).with(nextorsame(weekstart)).plusdays((weekno - 1) * 7); } 

or alternative:

return year.of(year).atday(1).with(aligned_week_of_year, weekno).with(nextorsame(weekstart)); 

and call this:

import static java.time.dayofweek.monday; import static java.time.dayofweek.sunday;  system.out.println(getstartingdate(2016, 1, sunday)); //2016-01-03 system.out.println(getstartingdate(2016, 1, monday)); //2016-01-04