Calendar

savefrom

得到当前月的第一天.
Calendar c = Calendar.getInstance();c.set(Calendar.DAY_OF_MONTH, 1);  c.set(Calendar.HOUR_OF_DAY, 0);  c.set(Calendar.MINUTE, 0);  c.set(Calendar.SECOND, 0);  c.set(Calendar.MILLISECOND, 0);  c.add(Calendar.MONTH, 1);   




得到当前月的第后一天.
Calendar cal = Calendar.getInstance();cal.setTime(new Date());cal.set(Calendar.DAY_OF_MONTH, 1);cal.add(Calendar.MONTH, 1);cal.add(Calendar.DAY_OF_MONTH, -1);cal.get(Calendar.DAY_OF_MONTH);