Java tutorial
//package com.java2s; import java.text.SimpleDateFormat; import java.util.Date; public class Main { public static String getPreTime(String sj1, String jj) { SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String mydate1 = ""; try { Date date1 = format.parse(sj1); long Time = (date1.getTime() / 1000) + Integer.parseInt(jj) * 60; date1.setTime(Time * 1000); mydate1 = format.format(date1); } catch (Exception e) { } return mydate1; } public static String getTime() { Date currentTime = new Date(); SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String dateString = formatter.format(currentTime); String min; min = dateString.substring(14, 16); return min; } }