src/org/nutz/lang/util/CronSequenceGenerator.java
private void reset(Calendar calendar, List<Integer> fields) {
		for (int field : fields) {
			calendar.set(field, field == Calendar.DAY_OF_MONTH ? 1 : 0);
		}
	}
private void reset(Calendar calendar, List<Integer> fields) {
		for (int field : fields) {
			calendar.set(field, field == Calendar.DAY_OF_MONTH ? 1 : 0);
		}
	}
Reset the calendar setting all the fields provided to zero.