转自:https://www.cnblogs.com/longYou/p/6382399.html
Calendar c = Calendar.getInstance(TimeZone.getTimeZone("GMT+08:00")); //获取东八区时间
//获取年
int year = c.get(Calendar.YEAR);
//获取月份,0表示1月份
int month = c.get(Calendar.MONTH) + 1;
//获取当前天数
int day = c.get(Calendar.DAY_OF_MONTH);
//获取本月最小天数
int first = c.getActualMinimum(Calendar.DAY_OF_MONTH);
//获取本月最大天数
int last = c.getActualMaximum(Calendar.DAY_OF_MONTH);
//获取当前小时
int time = c.get(Calendar.HOUR_OF_DAY);
//获取当前分钟
int min = c.get(Calendar.MINUTE);
//获取当前秒
int sec = c.get(Calendar.SECOND);
SimpleDateFormat s = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String curDate = s.format(c.getTime()); //当前日期
System.out.println("当前时间:" + year + "-" + month + "-" + day + " " + time + ":" + min + ":" + sec);
System.out.println("第一天和最后天:" + first +"," + last);
System.out.println("当前日期:" + curDate);