Have you notice that in Facebook app you can @ people...but only at certain times?

Question

Has anyone else noticed that at certain times in Facebook app you can @ people and other times you can't? I can't seem to figure out when tho. Any ideas?

Answer 1

Something like this will work:
long now = System.currentTimeMillis();
GregorianCalendar cal = new GregorianCalendar();
cal.set(Calendar.HOUR,17);
cal.set(Calendar.MINUTE,0);
cal.set(Calendar.SECOND,0);
int day = cal.get(Calendar.DAYOFWEEK);
int yearday = cal.get(Calendar.DAYOFYEAR);
cal.set(Calendar.DAYOFYEAR,yearday + (day == Calendar.FRIDAY)? 3 : 1))
long next = cal.getTime() //don't know... maybe needs another getTime()?
Thread.currentThread.sleep(next-now);