Question

SimpleDateFormat "W" default set SUNDAY is first day of week,ex:

SimpleDateFormat f = new SimpleDateFormat("W"); 
format.f(new Date()); 

i want to set "W" first day is MONDAY,i try:

SimpleDateFormat f = new SimpleDateFormat("W"); 
Calendar c=Calendar.getInstance(); 
c.setTimeInMillis(input); 
c.setFirstDayOfWeek(Calendar.MONDAY); 
format.format(c.getTime()) 

but no effect.

Answer 1

use setCalendar() on your SimpleDateFormat to set the calendar used for date calculations:

SimpleDateFormat format = new SimpleDateFormat("W");
Calendar calendar = Calendar.getInstance();
calendar.setFirstDayOfWeek( Calendar.MONDAY );
format.setCalendar( calendar ); 
format.format( whateverDateYouWantToFormat );`