Java日期操作日期

1.将字符串String转为Calendar

String dateString = "2018-09-11";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date date = sdf.parse(dateString);
Calendar cal = Calendar.getInstance();
cal.setTime(date);

2.日期加减

# 月份加1
Calendar cal = Calendar.getInstance(); 
cal.add(Calendar.MONTH, 1);

3.Calendar转Date

Date date = cal.getTime();

4.Date转String

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String strDate = sdf.format(date);

参考文章：

1. Java Example – Convert Date to String；