时间函数

1、修改时间参数

Calendar startTime = Calendar.getInstance();

startTime.set( Calendar.HOUR , 8 );

startTime.set(Calendar.MINUTE, 00);

startTime.set(Calendar.SECOND, 00);

2、Calendar 转化 String

Calendar calendar = Calendar.getInstance();

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

String dateStr = sdf.format(calendar.getTime());

3、Date 转化Calendar

Calendar calendar = Calendar.getInstance();

calendar.setTime(new Date() );

4、Calendar转化Date

Calendar calendar = Calendar.getInstance();

Date date =calendar.getTime();