日期工具类详解
记录一下常用的工具类，方便使用的时候可以获取。
package com.jbx.util;
import java.sql.Timestamp;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;
public class DateUtil {
/**
* @param date
* 日期类型
* @return String yyyy-MM-dd 日期字符串
* */
static public String getDateStr(Date date) {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
return format.format(date);
}
/**
* @param date
* 字符串日期类型
* @return Date yyyyMMdd 日期类型
* */
static public Date getDateFromYYYYMMDD(String date) throws ParseException {
SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");
return format.parse(date);
}
/**
* @param date
* 日期类型
* @return String MM-dd 日期字符串
* */
static public String getDateStrMMDD(Date date) {
SimpleDateFormat format = new SimpleDateFormat("MM-dd");
return format.format(date);
}
/**
* @param date
* 日期类型
* @return String HH:mm:ss 日期字符串（24小时制）
* */
static public String getDateStrForTime(Date date) {
SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss");
return format.format(date);
}
/**
* @param date
* 日期类型
* @return String yyyy 日期字符串
* */
static public String getYear(Date date) {
SimpleDateFormat format = new SimpleDateFormat("yyyy");
return format.format(date);
}
/**
* @param date
* 日期类型
* @return String yyyy年MM月dd日 日期字符串
* */
static public String getDateStrC(Date date) {
SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日");
return format.format(date);
}
/**
* @param date
* 日期类型
* @return String yyyyMMdd 日期字符串
* */
static public String getDateStrCompact(Date date) {
if (date == null)
return "";
SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");
String str = format.format(date);
return str;
}
/**
* @param date
* 日期类型
* @return String HHmmss 日期字符串（24小时制）
* */
static public String getDateStrCompact2(Date date) {
if (date == null)
return "";
SimpleDateFormat format = new SimpleDateFormat("HHmmss");
String str = format.format(date);
return str;
}
/**
* 格式化时间
*
* @param date:Date类型的数据
* @return YYYYMMDDhhmm格式的字符串
*/
public static String getFormatDate(Date date){
if(null==date){
return "-";
}
else{
java.text.DateFormat format = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm");
return format.format(date);
}
}
/**
* 格式化时间
*
* @param date:Date类型的数据
* @return MM月dd日格式的字符串
*/
public static String getFormatMMddDate(Date date){
if(null==date){
return "-";
}
else{
java.text.DateFormat format = new java.text.SimpleDateFormat("MM月dd日");
return format.format(date);
}
}
/**
* @param date
* 日期类型
* @return String yyyy-MM-dd HH:mm:ss 日期字符串（24小时制）
* */
static public String getDateTimeStr(Date date) {
if (date == null) {
return "";
}
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return format.format(date);
}
/**
* @param date
* 日期类型
* @return String yyyy年MM月dd日 HH时mm分ss秒 日期字符串（24小时制）
* */
static public String getDateTimeStrC(Date date) {
SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日 HH时mm分ss秒");
return format.format(date);
}
/**
* @param pattern
* 日期格式化类型 如：yyyy-MM-dd yyyyMMdd等
* @return String 日期字符串（当前时间 24小时制）
* */
public static String getCurDateStr(String pattern) {
SimpleDateFormat format = new SimpleDateFormat(pattern);
return format.format(new Date());
}
/**
* @param s
* 字符串日期类型 yyyy-MM-dd格式
* @return date 日期类型
* */
static public Date parseDate(String s) throws ParseException {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
return format.parse(s);
}
/**
* @param s
* 字符串日期类型 yyyy-MM-dd格式
* @return date 日期类型
* */
static public Date parseDateC(String s) throws ParseException {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
return format.parse(s);
}
/**
* @param s
* 字符串日期类型 yyyy-MM-dd HH:mm:ss格式
* @return date 日期类型
* */
static public Date parseDateTime(String s) throws ParseException {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return format.parse(s);
}
/**
* @param s
* 字符串日期类型 yyyy-MM-dd HH:mm格式
* @return date 日期类型
* */
static public Date parseDateTime2(String s) throws ParseException {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm");
return format.parse(s);
}
/**
* @param s
* 字符串日期类型 yyyy年MM月dd日 HH时mm分ss秒格式
* @return date 日期类型
* */
static public Date parseDateTimeC(String s) throws ParseException {
SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日 HH时mm分ss秒");
return format.parse(s);
}
/**
* @param s
* 字符串日期类型 HH:mm:ss格式
* @return date 日期类型
* */
static public Date parseTime(String s) throws ParseException {
SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss");
return format.parse(s);
}
/**
* @param s
* 字符串日期类型 HH时mm分ss秒格式
* @return date 日期类型
* */
static public Date parseTimeC(String s) throws ParseException {
SimpleDateFormat format = new SimpleDateFormat("HH时mm分ss秒");
return format.parse(s);
}
/**
* @param date 日期类型
* */
static public int yearOfDate(Date date) throws ParseException {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
String d = format.format(date);
return Integer.parseInt(d.substring(0, 4));
}
static public int monthOfDate(Date s) throws ParseException {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
String d = format.format(s);
return Integer.parseInt(d.substring(5, 7));
}
static public int dayOfDate(Date s) throws ParseException {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
String d = format.format(s);
return Integer.parseInt(d.substring(8, 10));
}
static public String getDateTimeStr(java.sql.Date date, double time) {
int year = date.getYear() + 1900;
int month = date.getMonth() + 1;
int day = date.getDate();
String dateStr = year + "-" + month + "-" + day;
Double d = new Double(time);
String timeStr = String.valueOf(d.intValue()) + ":00:00";
return dateStr + " " + timeStr;
}
/**
* Get the total month from two date.
*
* @param sd
* the start date
* @param ed
* the end date
* @return int month form the start to end date
* @throws ParseException
*/
static public int diffDateM(Date sd, Date ed) throws ParseException {
return (ed.getYear() - sd.getYear()) * 12 + ed.getMonth()
- sd.getMonth() + 1;
}
static public int diffDateD(Date sd, Date ed) throws ParseException {
return Math.round((ed.getTime() - sd.getTime()) / 86400000) + 1;
}
static public int diffDateM(int sym, int eym) throws ParseException {
return (Math.round(eym / 100) - Math.round(sym / 100)) * 12
+ (eym % 100 - sym % 100) + 1;
}
static public java.sql.Date getNextMonthFirstDate(java.sql.Date date) throws ParseException {
Calendar scalendar = new GregorianCalendar();
scalendar.setTime(date);
scalendar.add(Calendar.MONTH, 1);
scalendar.set(Calendar.DATE, 1);
return new java.sql.Date(scalendar.getTime().getTime());
}
static public java.sql.Date getFrontDateByDayCount(java.sql.Date date, int dayCount) throws ParseException {
Calendar scalendar = new GregorianCalendar();
scalendar.setTime(date);
scalendar.add(Calendar.DATE, -dayCount);
return new java.sql.Date(scalendar.getTime().getTime());
}
/**
* Get first day of the month.
*
* @param year
* the year
* @param month
* the month
* @return Date first day of the month.
* @throws ParseException
*/
static public Date getFirstDay(String year, String month) throws ParseException {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
return format.parse(year + "-" + month + "-1");
}
static public Date getFirstDay(int year, int month) throws ParseException {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
return format.parse(year + "-" + month + "-1");
}
static public Date getLastDay(String year, String month) throws ParseException {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Date date = format.parse(year + "-" + month + "-1");
Calendar scalendar = new GregorianCalendar();
scalendar.setTime(date);
scalendar.add(Calendar.MONTH, 1);
scalendar.add(Calendar.DATE, -1);
date = scalendar.getTime();
return date;
}
static public Date getLastDay(int year, int month) throws ParseException {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Date date = format.parse(year + "-" + month + "-1");
Calendar scalendar = new GregorianCalendar();
scalendar.setTime(date);
scalendar.add(Calendar.MONTH, 1);
scalendar.add(Calendar.DATE, -1);
date = scalendar.getTime();
return date;
}
/**
* getToday get todat string with format YYYY-MM-DD from a Date object
*
* @param date
* date
* @return String
*/
static public String getTodayStr() throws ParseException {
Calendar calendar = Calendar.getInstance();
return getDateStr(calendar.getTime());
}
static public Date getToday() throws ParseException {
return new Date(System.currentTimeMillis());
}
static public String getTodayAndTime() {
return new Timestamp(System.currentTimeMillis()).toString();
}
static public String getTodayC() throws ParseException {
Calendar calendar = Calendar.getInstance();
return getDateStrC(calendar.getTime());
}
static public int getThisYearMonth() throws ParseException {
Date today = Calendar.getInstance().getTime();
return (today.getYear() + 1900) * 100 + today.getMonth() + 1;
}
static public int getYearMonth(Date date) throws ParseException {
return (date.getYear() + 1900) * 100 + date.getMonth() + 1;
}
// 获取相隔月数
static public long getDistinceMonth(String beforedate, String afterdate)
throws ParseException {
SimpleDateFormat d = new SimpleDateFormat("yyyy-MM-dd");
long monthCount = 0;
try {
java.util.Date d1 = d.parse(beforedate);
java.util.Date d2 = d.parse(afterdate);
monthCount = (d2.getYear() - d1.getYear()) * 12 + d2.getMonth()
- d1.getMonth();
// dayCount = (d2.getTime()-d1.getTime())/(30*24*60*60*1000);
} catch (ParseException e) {
System.out.println("Date parse error!");
// throw e;
}
return monthCount;
}
// 获取相隔天数
static public long getDistinceDay(String beforedate, String afterdate) throws ParseException {
SimpleDateFormat d = new SimpleDateFormat("yyyy-MM-dd");
long dayCount = 0;
try {
java.util.Date d1 = d.parse(beforedate);
java.util.Date d2 = d.parse(afterdate);
dayCount = (d2.getTime() - d1.getTime()) / (24 * 60 * 60 * 1000);
} catch (ParseException e) {
System.out.println("Date parse error!");
// throw e;
}
return dayCount;
}
// 获取相隔天数
static public long getDistinceDay(Date beforedate, Date afterdate) throws ParseException {
long dayCount = 0;
try {
dayCount = (afterdate.getTime() - beforedate.getTime())
/ (24 * 60 * 60 * 1000);
} catch (Exception e) {
// System.out.println("Date parse error!");
// // throw e;
}
return dayCount;
}
static public long getDistinceDay(java.sql.Date beforedate, java.sql.Date afterdate) throws ParseException {
long dayCount = 0;
try {
dayCount = (afterdate.getTime() - beforedate.getTime())
/ (24 * 60 * 60 * 1000);
} catch (Exception e) {
// System.out.println("Date parse error!");
// // throw e;
}
return dayCount;
}
// 获取相隔天数
static public long getDistinceDay(String beforedate) throws ParseException {
return getDistinceDay(beforedate, getTodayStr());
}
// 获取相隔小时数
static public long getDistinceTime(String beforeDateTime, String afterDateTime) throws ParseException {
SimpleDateFormat d = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
long timeCount = 0;
try {
java.util.Date d1 = d.parse(beforeDateTime);
java.util.Date d2 = d.parse(afterDateTime);
timeCount = (d2.getTime() - d1.getTime()) / (60 * 60 * 1000);
} catch (ParseException e) {
System.out.println("Date parse error!");
throw e;
}
return timeCount;
}
/**
* 获取两个日期的相隔小时数
* @param beforeDateTime 起始日期
* @param afterDateTime 结束日期
* @return
* @throws ParseException
* @author cuiqc 2018-01-15
*/
static public long getDistinceTime(Date beforeDateTime, Date afterDateTime) throws ParseException {
//afterDateTime该日期在beforeDateTime日期之后，也就是大于
if(null != beforeDateTime && null != afterDateTime && afterDateTime.after(beforeDateTime)){
long timeCount = afterDateTime.getTime() - beforeDateTime.getTime();
long hour = timeCount / (60 * 60 * 1000);
return hour;
}
return 0;
}
// 获取相隔时间中文描述
static public String getDistinceTimeC(Date beforeDateTime, Date afterDateTime){
long timeCountH = (afterDateTime.getTime() - beforeDateTime.getTime()) / (60 * 60 * 1000);
long timeCountM = ((afterDateTime.getTime() - beforeDateTime.getTime()) % (60 * 60 * 1000)) / (60 * 1000);
if(0==timeCountM){
return timeCountH + "小时";
}else{
return timeCountH + "小时" + timeCountM + "分钟";
}
}
// 获取相隔时间中文描述
static public String getDistinceTimeByLan(Date beforeDateTime, Date afterDateTime,String lanType){
long timeCountH = (afterDateTime.getTime() - beforeDateTime.getTime()) / (60 * 60 * 1000);
long timeCountM = ((afterDateTime.getTime() - beforeDateTime.getTime()) % (60 * 60 * 1000)) / (60 * 1000);
if ("zh_TW".equals(lanType)) {
return timeCountH + "小時" + timeCountM + "分鍾";
}else if ("en_US".equals(lanType)){
return timeCountH + "hours" + timeCountM + "minutes";
}else{
return timeCountH + "小时" + timeCountM + "分钟";
}
}
// 获取相隔时间中文描述
static public String getDistinceTimeTW(Date beforeDateTime, Date afterDateTime){
long timeCountH = (afterDateTime.getTime() - beforeDateTime.getTime()) / (60 * 60 * 1000);
long timeCountM = ((afterDateTime.getTime() - beforeDateTime.getTime()) % (60 * 60 * 1000)) / (60 * 1000);
return timeCountH + "小時" + timeCountM + "分鍾";
}
/**
* 获取时间中文描述,飞行时间格式:03:20 ,字符串格式
* @param time 飞行时间
* @param lanType 语言
* @return
*/
static public String getDistinceTimeByLan(String time,String lanType){
String times[] = time.split(":");
String timeCountH = times[0];
String timeCountM = times[1];
if ("zh_TW".equals(lanType)) {
return timeCountH + "小時" + timeCountM + "分鍾";
}else if ("en_US".equals(lanType)){
return timeCountH + "hours" + timeCountM + "minutes";
}else{
return timeCountH + "小时" + timeCountM + "分钟";
}
}
/**
* @param date
* @author Uncle_Dallas 主要用于航班查询模块
* @date 2011-03-14
* @return HH:MM:SS的字符串
* */
public static String getCommonTimeFormat(Date date) {
return getDateTimeStr(date).split(" ")[1];
}
/**
* @param date
* @author Uncle_Dallas
* @date 2011-03-16
* @return HHmm 的字符串
* */
static public String getDateStrToTime(Date date) {
if(null == date){
return "-";
}
SimpleDateFormat format = new SimpleDateFormat("HH:mm");
return format.format(date);
}
/**
* @param date
* @author Uncle_Dallas 主要用于航班查询模块
* @date 2011-03-14
* @return 15MAR11的字符串
* */
public static String getCommonDateFormat(String date) {
String[] n = date.split("-");
return n[2] + getMonth(n[1], "MMM") + n[0].substring(2);
}
public static String getCommonFormateDate(String str) {
String date = str.substring(0, 2);
String month = getMonth(str.substring(2, 5), "MM");
String year = str.substring(5, 7);
StringBuffer sb = new StringBuffer();
sb.append("20").append(year).append("-").append(month).append("-");
sb.append(date);
return sb.toString();
}
/**
* 获取普通格式的日期，20110101
*
* @param str
* 格式如：21APR11
* @return
*/
public static String getCommonDate(String str) {
String date = str.substring(0, 2);
String month = getMonth(str.substring(2, 5), "MM");
String year = str.substring(5, 7);
StringBuffer sb = new StringBuffer();
sb.append("20").append(year).append(month).append(date);
return sb.toString();
}
public static String getMonth(String strMonth, String rtnType) {
String tempstrMonth = "";
if (strMonth.length() <= 2 && rtnType.equalsIgnoreCase("MM")
|| strMonth.length() == 3 && rtnType.equalsIgnoreCase("MMM"))
tempstrMonth = strMonth;
else {
if (strMonth.length() <= 2 && rtnType.equalsIgnoreCase("MMM")) {
if (strMonth.equals("01") || strMonth.equals("1"))
tempstrMonth = "Jan";
if (strMonth.equals("02") || strMonth.equals("2"))
tempstrMonth = "Feb";
if (strMonth.equals("03") || strMonth.equals("3"))
tempstrMonth = "Mar";
if (strMonth.equals("04") || strMonth.equals("4"))
tempstrMonth = "Apr";
if (strMonth.equals("05") || strMonth.equals("5"))
tempstrMonth = "May";
if (strMonth.equals("06") || strMonth.equals("6"))
tempstrMonth = "Jun";
if (strMonth.equals("07") || strMonth.equals("7"))
tempstrMonth = "Jul";
if (strMonth.equals("08") || strMonth.equals("8"))
tempstrMonth = "Aug";
if (strMonth.equals("09") || strMonth.equals("9"))
tempstrMonth = "Sep";
if (strMonth.equals("10"))
tempstrMonth = "Oct";
if (strMonth.equals("11"))
tempstrMonth = "Nov";
if (strMonth.equals("12"))
tempstrMonth = "Dec";
}
if (strMonth.length() == 3 && rtnType.equalsIgnoreCase("MM")) {
if (strMonth.equalsIgnoreCase("Jan"))
tempstrMonth = "01";
if (strMonth.equalsIgnoreCase("Feb"))
tempstrMonth = "02";
if (strMonth.equalsIgnoreCase("Mar"))
tempstrMonth = "03";
if (strMonth.equalsIgnoreCase("Apr"))
tempstrMonth = "04";
if (strMonth.equalsIgnoreCase("May"))
tempstrMonth = "05";
if (strMonth.equalsIgnoreCase("Jun"))
tempstrMonth = "06";
if (strMonth.equalsIgnoreCase("Jul"))
tempstrMonth = "07";
if (strMonth.equalsIgnoreCase("Aug"))
tempstrMonth = "08";
if (strMonth.equalsIgnoreCase("Sep"))
tempstrMonth = "09";
if (strMonth.equalsIgnoreCase("Oct"))
tempstrMonth = "10";
if (strMonth.equalsIgnoreCase("Nov"))
tempstrMonth = "11";
if (strMonth.equalsIgnoreCase("Dec"))
tempstrMonth = "12";
}
}
return tempstrMonth.toUpperCase();
}
// 获取相隔时间
static public long getDistinceTime(String beforeDateTime)
throws ParseException {
return getDistinceTime(beforeDateTime,
new Timestamp(System.currentTimeMillis()).toLocaleString());
}
/**
*
* @param date
* 传入时间
* @param pattern
* 时间格式
* @return
*/
/** 获得中文格式的时间字符串 */
public static String getDateFormatCnStr(Date date, String pattern) {
if (date == null)
return "";
String result = null;
try {
SimpleDateFormat sdf = new SimpleDateFormat(pattern, Locale.SIMPLIFIED_CHINESE);
result = sdf.format(date);
} catch (Exception e) {
System.out.println("时间转换出错：Date" + date.toString() + ",pattern" + pattern);
e.printStackTrace();
}
if (!isNull(result))
return result;
return "";
}
/** 判断字符串是否为null */
public static boolean isNull(String value) {
return (value == null || value.trim().length() == 0);
}
public static final String dateToString(Date date, String s) {
if (date == null || s == null)
return "";
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return calendarToString(calendar, s);
}
public static final String calendarToString(Calendar calendar, String s) {
if (s == null || calendar == null)
return "";
String s1 = s.toUpperCase();
String as[] = { "SUNDAY", "MONDAY", "TUESDAY", "WEDNESDAY", "THURSDAY",
"FRIDAY", "SATURDAY" };
int i = calendar.get(1);
int j = calendar.get(2);
int k = calendar.get(5);
int l = calendar.get(11);
int i1 = calendar.get(12);
int j1 = calendar.get(13);
int k1 = calendar.get(7) - 1;
int l1 = s1.indexOf("YYYY");
if (l1 != -1) {
s1 = s1.substring(0, l1) + i + s1.substring(l1 + 4);
} else {
l1 = s1.indexOf("YY");
if (l1 != -1) {
// add by WYT
// 修改年份为"00"是判断出错的情况
// int j2 = i <= 2000 ? i - 1900 : i - 2000;
int j2 = i % 100;
// end
s1 = s1.substring(0, l1)
+ (j2 >= 10 ? String.valueOf(j2) : "0" + j2)
+ s1.substring(l1 + 2);
} else {
l1 = s1.indexOf("Y");
if (l1 != -1) {
// add by WYT
// 修改年份为"00"是判断出错的情况
// int j2 = i <= 2000 ? i - 1900 : i - 2000;
int j2 = i % 10;
// end
s1 = s1.substring(0, l1) + j2 + s1.substring(l1 + 1);
}
}
}
l1 = s1.indexOf("HH");
if (l1 != -1) {
s1 = s1.substring(0, l1) + (l >= 10 ? String.valueOf(l) : "0" + l)
+ s1.substring(l1 + 2);
} else {
l1 = s1.indexOf("H");
if (l1 != -1)
s1 = s1.substring(0, l1) + l + s1.substring(l1 + 1);
}
l1 = s1.indexOf("MI");
if (l1 != -1)
s1 = s1.substring(0, l1)
+ (i1 >= 10 ? String.valueOf(i1) : "0" + i1)
+ s1.substring(l1 + 2);
l1 = s1.indexOf("SS");
if (l1 != -1)
s1 = s1.substring(0, l1)
+ (j1 >= 10 ? String.valueOf(j1) : "0" + j1)
+ s1.substring(l1 + 2);
l1 = s1.indexOf("DD");
if (l1 != -1) {
s1 = s1.substring(0, l1) + (k >= 10 ? String.valueOf(k) : "0" + k)
+ s1.substring(l1 + 2);
} else {
l1 = s1.indexOf("D");
if (l1 != -1)
s1 = s1.substring(0, l1) + k + s1.substring(l1 + 1);
}
l1 = s1.indexOf("MMM");
if (l1 != -1) {
s1 = s1.substring(0, l1) + encodeMonth(j) + s1.substring(l1 + 3);
} else {
l1 = s1.indexOf("MM");
if (l1 != -1) {
s1 = s1.substring(0, l1)
+ (j >= 9 ? String.valueOf(j + 1) : "0" + (j + 1))
+ s1.substring(l1 + 2);
} else {
l1 = s1.indexOf("M");
if (l1 != -1)
s1 = s1.substring(0, l1) + (j + 1) + s1.substring(l1 + 1);
}
}
l1 = s1.indexOf("WWW");
if (l1 != -1) {
s1 = s1.substring(0, l1) + as[k1].substring(0, 3)
+ s1.substring(l1 + 3);
} else {
int i2 = s1.indexOf("WW");
if (i2 != -1)
s1 = s1.substring(0, i2) + as[k1].substring(0, 2)
+ s1.substring(i2 + 2);
}
return s1;
}
private static final String encodeMonth(int i) {
String as[] = { "JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG",
"SEP", "OCT", "NOV", "DEC" };
if (i >= 0 && i < 12)
return as[i];
else
return "";
}
/**
* 根据主机日期字符串格式转化成Date格式的日期
*
* @param hostdate
* 21APR11
* @return Date
* @throws ParseException
*/
public static Date hostDateStr2Date(String hostdate) throws ParseException {
return parseDate(getCommonFormateDate(hostdate));
}
/**
* 获得date的前days的日期
*
* @param date
* Date
* @param days
* int 天数
* @return String yyyy-MM-dd
*/
public static Date getBeforeDate(Date date, int days) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(Calendar.DAY_OF_YEAR, calendar.get(Calendar.DAY_OF_YEAR)
- days);
return calendar.getTime();
}
/**
* 获得date的后days的日期
*
* @param date
* Date
* @param days
* int 天数
* @return String yyyy-MM-dd
*/
public static Date getAfterDate(Date date, int days) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(Calendar.DAY_OF_YEAR, calendar.get(Calendar.DAY_OF_YEAR)
+ days);
return calendar.getTime();
}
/**
* 获得date的前days的日期
*
* @param date
* String yyyy-MM-dd形式的字符串
* @param days
* int 天数
* @return String yyyy-MM-dd
*/
public static String getBeforeDate(String date, int days) {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
try {
Date d = df.parse(date);
Calendar calendar = Calendar.getInstance();
calendar.setTime(d);
calendar.set(Calendar.DAY_OF_YEAR,
calendar.get(Calendar.DAY_OF_YEAR) - days);
return df.format(calendar.getTime());
} catch (ParseException e) {
e.printStackTrace();
return "";
}
}
/**
* 获得date的前days的日期
*
* @param date
* String yyyyMMdd形式的字符串
* @param days
* int 天数
* @return String yyyy-MM-dd
*/
public static String getBeforeDateStr(String date, int days) {
SimpleDateFormat df = new SimpleDateFormat("yyyyMMdd");
try {
Date d = df.parse(date);
Calendar calendar = Calendar.getInstance();
calendar.setTime(d);
calendar.set(Calendar.DAY_OF_YEAR,
calendar.get(Calendar.DAY_OF_YEAR) - days);
return df.format(calendar.getTime());
} catch (ParseException e) {
e.printStackTrace();
return "";
}
}
/**
* 获得date的后days的日期
*
* @param date
* String yyyy-MM-dd形式的字符串
* @param days
* int 天数
* @return String yyyy-MM-dd
*/
public static String getAfterDate(String date, int days) {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
try {
Date d = df.parse(date);
Calendar calendar = Calendar.getInstance();
calendar.setTime(d);
calendar.set(Calendar.DAY_OF_YEAR,
calendar.get(Calendar.DAY_OF_YEAR) + days);
return df.format(calendar.getTime());
} catch (ParseException e) {
e.printStackTrace();
return "";
}
}
/**
* 通过DATE获得Week
* @param datDate Date
* @return
*/
public static String getDayOfWeek(Date datDate,Locale mylocale){
Calendar calendar = Calendar.getInstance();
calendar.setTime(datDate);
int iWeek = calendar.get(Calendar.DAY_OF_WEEK)-1;
if(mylocale == null) {
mylocale = Locale.SIMPLIFIED_CHINESE;
}
String strWeek = "";
if(mylocale.getCountry().equalsIgnoreCase("CN")){
String[] sWeek = {"日","一","二","三","四","五","六"};
strWeek = sWeek[iWeek];
}else if(mylocale.getCountry().equalsIgnoreCase("TW")){
String[] sWeek = {"日","壹","二","三","四","五","六"};
strWeek = sWeek[iWeek];
}else{
String as[] = { "SUNDAY", "MONDAY", "TUESDAY", "WEDNESDAY", "THURSDAY",
"FRIDAY", "SATURDAY" };
strWeek = as[iWeek];
}
return strWeek;
}
/**
* 获取两个日期之间相差多少天
* @param c1 日期1
* @param c2 日期2
* @return 天数，日期1和日期2的顺序不影响结果，结果始终为整数
*/
public static int getDays(Calendar c1, Calendar c2) {
if (c1.after(c2)) {
Calendar swap = c1;
c1 = c2;
c2 = swap;
}
int days = c2.get(Calendar.DAY_OF_YEAR) - c1.get(Calendar.DAY_OF_YEAR);
int y2 = c2.get(Calendar.YEAR);
while (c1.get(Calendar.YEAR) != y2) {
days = days + c1.getActualMaximum(Calendar.DAY_OF_YEAR);
c1.add(Calendar.YEAR, 1);
}
return days;
}
}
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