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1、* Title: 时间格式转化与计算*/package ;import java.util.Calendar;import java.util.Date;import java.text.*;public class DateTime public DateTime() /* * 获得系统目前时间 * return String yyyy-mm-dd */ public String getCurrentDate() Calendar rightNow = Calendar.getInstance(); int year = rightNow.get(rightNow.YEAR); int m
2、onth = rightNow.get(rightNow.MONTH) + 1; int day = rightNow.get(rightNow.DATE); return year + - + month + - + day; /* * 获得系统目前时间 * return String yyyy年mm月dd日 */ public String getCurrentDate1() Calendar rightNow = Calendar.getInstance(); int year = rightNow.get(rightNow.YEAR); int month = rightNow.get
3、(rightNow.MONTH) + 1; int day = rightNow.get(rightNow.DATE); return year + 年 + month + 月 + day + 日; /* * 获得系统目前时间 * return String yyyymmdd */ public String getCurrentDate2() Calendar rightNow = Calendar.getInstance(); int year = rightNow.get(rightNow.YEAR); int month = rightNow.get(rightNow.MONTH) +
4、 1; int day = rightNow.get(rightNow.DATE); return year + + month + + day; /* * 获得系统目前时间 * return String yyyy-mm */ public String getCurrentDate3() Calendar rightNow = Calendar.getInstance(); int year = rightNow.get(rightNow.YEAR); int month = rightNow.get(rightNow.MONTH) + 1; /int day = rightNow.get
5、(rightNow.DATE); return year + - + month; /* * 获得系统目前时间 * return String yyyyMMddhhmmss */ public String getCurrentDate4() Calendar c = Calendar.getInstance(); c.add(c.SECOND, 0); return + c.get(c.YEAR) + + (c.get(c.MONTH) + 1) + + c.get(c.DATE)+c.get(c.HOUR_OF_DAY)+c.get(c.MINUTE)+c.get(c.SECOND); /
6、* * 获得系统目前时间 * return String yyyy-MM-dd hh:mm:ss */* public String getCurrentDate5() SimpleDateFormat simpleDateFormat =new SimpleDateFormat(yyyy-MM-dd hh:mm:ss); java.util.Date date = new java.util.Date(); String time = simpleDateFormat.format(date); return time; */* 获得系统目前时间* return String yyyy-MM
7、-dd hh:mm:ss*/ public String getCurrentDate5() Calendar c = Calendar.getInstance(); c.add(c.SECOND, 0); return + c.get(c.YEAR) + - + (c.get(c.MONTH) + 1) + - + c.get(c.DATE)+ +c.get(c.HOUR_OF_DAY)+:+c.get(c.MINUTE)+:+c.get(c.SECOND); /* * 获得系统目前时间 常用于订单号 * return String yyyyMMddhhmmss */ public Stri
8、ng getCurrentDate6() Calendar c = Calendar.getInstance(); c.add(c.SECOND, 0); String year=c.get(c.YEAR)+; return + year.subSequence(2,year.length()+ + (c.get(c.MONTH) + 1) + + c.get(c.DATE)+-+c.get(c.HOUR_OF_DAY)+c.get(c.MINUTE)+c.get(c.SECOND)+-+c.get(c.MILLISECOND); /* * 获得系统目前时间前n个月旳相对应旳一天 * para
9、m n int * return String yyyy-mm-dd */ public String getNMonthBeforeCurrentDay(int n) Calendar c = Calendar.getInstance(); c.add(c.MONTH, -n); return + c.get(c.YEAR) + - + (c.get(c.MONTH) + 1) + - + c.get(c.DATE); /* * 获得系统目前时间后n个月旳相对应旳一天 * param n int * return String yyyy-mm-dd */ public String getN
10、MonthAfterCurrentDay(int n) Calendar c = Calendar.getInstance(); c.add(c.MONTH, n); return + c.get(c.YEAR) + - + (c.get(c.MONTH) + 1) + - + c.get(c.DATE); /* * 获得系统目前时间前n天 * param n int * return String yyyy-mm-dd */ public String getNDayBeforeCurrentDate(int n) Calendar c = Calendar.getInstance(); c
11、.add(c.DAY_OF_MONTH, -n); return + c.get(c.YEAR) + - + (c.get(c.MONTH) + 1) + - + c.get(c.DATE); /* * 获得系统目前时间后n天 * param n int * return String yyyy-mm-dd */ public String getNDayAfterCurrentDate(int n) Calendar c = Calendar.getInstance(); c.add(c.DAY_OF_MONTH, n); return + c.get(c.YEAR) + - + (c.ge
12、t(c.MONTH) + 1) + - + c.get(c.DATE); /- /取过去一种时间对应旳系统当年旳一天 public String getCurrentDateAfterPastDate(String sPastDate) if (sPastDate != null & !sPastDate.equals() Date date = switchStringToDate(sPastDate); Calendar c = Calendar.getInstance(); c.setTime(date); int iPastYear = c.get(c.YEAR); Calendar
13、c1 = Calendar.getInstance(); int iCurrentYear = c1.get(c1.YEAR); c.add(c.YEAR, iCurrentYear - iPastYear); return + c.get(c.YEAR) + - + (c.get(c.MONTH) + 1) + - + c.get(c.DATE); else return null; /* * 将一种日期字符串转化成日期 * param sDate String * return Date yyyy-mm-dd */ public Date switchStringToDate(String sDate) Date date = null;
