Java日期格式轉(zhuǎn)換

1.Date轉(zhuǎn)String

Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateString = formatter.format(currentTime);

2.String轉(zhuǎn)Date

String dateString  = "2021/2/20 15:45:00";
SimpleDateFormat format = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
Date date = format.parse(dateString);

Java日期格式增加時間

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date now = new Date();

// 1.添加毫秒（5分鐘）
Date date1 = new Date(now.getTime() + 1000*60*5);
// 2.Calendar添加 (YEAR 年、MONTH 月、DATE 日、HOUR_OF_DAY 時、MINUTE 分、SECOND/MILLISECOND    秒/毫秒)
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.MINUTE, 5);
Date date2 = calendar.getTime();