java时间函数代码

/**
* 将某个日期以固定格式转化成字符串
*
* @param date
* @return String
*/
public static String dateToStr(java.util.Date date)
{
SimpleDateFormat sdf = newSimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String str =sdf.format(date);
return str;
}

/**
* 格式化日期
*
* @param dateStr
* 字符型日期
* @param format
* 格式
* @return 返回日期
*/
public static java.util.Date parseDate(String dateStr, Stringformat)
{
java.util.Date date = null;
try
{
java.text.DateFormat df = newjava.text.SimpleDateFormat(format);
String dt =dateStr.replaceAll("-", "/");
if((!dt.equals("")) && (dt.length() <format.length()))
{
dt +=format.substring(dt.length()).replaceAll("[YyMmDdHhSs]","0");
}
date = (java.util.Date)df.parse(dt);
}
catch (Exception e)
{
}
return date;
}

/**
* @param dateStr
* @return Date
*/
public static java.util.Date parseDate(String dateStr)
{
return parseDate(dateStr, "yyyy/MM/dd");
}

/**
* 格式化输出日期
*
* @param date
* 日期
* @param format
* 格式
* @return 返回字符型日期
*/
public static String format(java.util.Date date, Stringformat)
{
String result ="";
try
{
if (date != null)
{
java.text.DateFormat df =newjava.text.SimpleDateFormat(format);
result =df.format(date);
}
}
catch (Exception e)
{
}
return result;
}

public static String format(java.util.Date date)
{
return format(date, "yyyy/MM/dd");
}

/**
* 返回年份
*
* @param date
* 日期
* @return 返回年份
*/
public static int getYear(java.util.Date date)
{
java.util.Calendar c =java.util.Calendar.getInstance();
c.setTime(date);
return c.get(java.util.Calendar.YEAR);
}

/**
* 返回月份
*
* @param date
* 日期
* @return 返回月份
*/
public static int getMonth(java.util.Date date)
{
java.util.Calendar c =java.util.Calendar.getInstance();
c.setTime(date);
return c.get(java.util.Calendar.MONTH) + 1;
}

/**
* 返回日份
*
* @param date
* 日期
* @return 返回日份
*/
public static int getDay(java.util.Date date)
{
java.util.Calendar c =java.util.Calendar.getInstance();
c.setTime(date);
return c.get(java.util.Calendar.DAY_OF_MONTH);
}

/**
* 返回小时
*
* @param date
* 日期
* @return 返回小时
*/
public static int getHour(java.util.Date date)
{
java.util.Calendar c =java.util.Calendar.getInstance();
c.setTime(date);
return c.get(java.util.Calendar.HOUR_OF_DAY);
}

/**
* 返回分钟
*
* @param date
* 日期
* @return 返回分钟
*/
public static int getMinute(java.util.Date date)
{
java.util.Calendar c =java.util.Calendar.getInstance();
c.setTime(date);
return c.get(java.util.Calendar.MINUTE);
}

/**
* 返回秒钟
*
* @param date
* 日期
* @return 返回秒钟
*/
public static int getSecond(java.util.Date date)
{
java.util.Calendar c =java.util.Calendar.getInstance();
c.setTime(date);
return c.get(java.util.Calendar.SECOND);
}

/**
* 返回毫秒
*
* @param date
* 日期
* @return 返回毫秒
*/
public static long getMillis(java.util.Date date)
{
java.util.Calendar c =java.util.Calendar.getInstance();
c.setTime(date);
return c.getTimeInMillis();
}

/**
* 返回字符型日期
*
* @param date
* 日期
* @return 返回字符型日期
*/
public static String getDate(java.util.Date date)
{
return format(date, "yyyy/MM/dd");
}

/**
* 返回字符型时间
*
* @param date
* 日期
* @return 返回字符型时间
*/
public static String getTime(java.util.Date date)
{
return format(date, "HH:mm:ss");
}

/**
* 返回字符型日期时间
*
* @param date
* 日期
* @return 返回字符型日期时间
*/
public static String getDateTime(java.util.Date date)
{
return format(date, "yyyy/MM/dd HH:mm:ss");
}

/**
* 日期相加
*
* @param date
* 日期
* @param day
* 天数
* @return 返回相加后的日期
*/
public static java.util.Date addDate(java.util.Date date, int day)
{
java.util.Calendar c =java.util.Calendar.getInstance();
c.setTimeInMillis(getMillis(date)+ ((long) day)* 24 * 3600 * 1000);
return c.getTime();
}

/**
* 日期相减
*
* @param date
* 日期
* @param date1
* 日期
* @return 返回相减后的日期
*/
public static int diffDate(java.util.Date date, java.util.Datedate1)
{
return (int) ((getMillis(date) - getMillis(date1)) / (24 * 3600 *1000));
}

/**
* 取得指定月份的第一天
*
* @param strdate
* String
* @return String
*/
public static String getMonthBegin(String strdate)
{
java.util.Date date =parseDate(strdate);
return format(date, "yyyy-MM") +"-01";
}

/**
* 取得指定月份的最后一天
*
* @param strdate
* String
* @return String
*/
public static String getMonthEnd(String strdate)
{
java.util.Date date =parseDate(getMonthBegin(strdate));
Calendar calendar =Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.MONTH,1);
calendar.add(Calendar.DAY_OF_YEAR,-1);
return formatDate(calendar.getTime());
}

/**
* 常用的格式化日期
*
* @param date
* Date
* @return String
*/
public static String formatDate(java.util.Date date)
{
return formatDateByFormat(date,"yyyy-MM-dd");
}

/**
* 以指定的格式来格式化日期
*
* @param date
* Date
* @param format
* String
* @return String
*/
public static String formatDateByFormat(java.util.Date date, Stringformat)
{
String result ="";
if (date != null)
{
try
{
SimpleDateFormat sdf = newSimpleDateFormat(format);
result =sdf.format(date);
}
catch (Exceptionex)
{
ex.printStackTrace();
}
}
return result;
}

/**
* Description: 获取GMT8时间
* @return 将当前时间转换为GMT8时区后的Date
*/
public static Date getGMT8Time(){
Date gmt8 = null;
try {
Calendar cal =Calendar.getInstance(TimeZone.getTimeZone("GMT+8"),Locale.CHINESE);
Calendar day =Calendar.getInstance();
day.set(Calendar.YEAR,cal.get(Calendar.YEAR));
day.set(Calendar.MONTH,cal.get(Calendar.MONTH));
day.set(Calendar.DATE,cal.get(Calendar.DATE));
day.set(Calendar.HOUR_OF_DAY,cal.get(Calendar.HOUR_OF_DAY));
day.set(Calendar.MINUTE, cal.get(Calendar.MINUTE));
day.set(Calendar.SECOND,cal.get(Calendar.SECOND));
gmt8 =day.getTime();
} catch (Exception e) {
System.out.println("获取GMT8时间 getGMT8Time() error!");
e.printStackTrace();
gmt8 = null;
}
return gmt8;
}

packagecom.sipgl.eam.utils;

importjava.text.SimpleDateFormat;
importjava.util.ArrayList;
importjava.util.Calendar;
importjava.util.Date;
importjava.util.GregorianCalendar;
importjava.util.LinkedHashMap;

/**
* 日期公用处理类
*
* @author SongJun
* @version 1.3
*/
public class DateUtil {
/**
* 解析一个日期之间的所有月份
*
* @param beginDateStr
* @param endDateStr
* @return
*/
public static ArrayList getMonthList(String beginDateStr, StringendDateStr) {
//指定要解析的时间格式
SimpleDateFormat f = new SimpleDateFormat("yyyy-MM");
//返回的月份列表
String sRet = "";

//定义一些变量
Date beginDate = null;
Date endDate = null;

GregorianCalendar beginGC = null;
GregorianCalendar endGC = null;
ArrayList list = newArrayList();

try {
// 将字符串parse成日期
beginDate = f.parse(beginDateStr);
endDate =f.parse(endDateStr);

// 设置日历
beginGC = new GregorianCalendar();
beginGC.setTime(beginDate);

endGC = newGregorianCalendar();
endGC.setTime(endDate);

// 直到两个时间相同
while(beginGC.getTime().compareTo(endGC.getTime()) <= 0) {
sRet =beginGC.get(Calendar.YEAR) + "-"
+(beginGC.get(Calendar.MONTH) + 1);
list.add(sRet);
// 以月为单位，增加时间
beginGC.add(Calendar.MONTH, 1);
}
return list;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

/**
* 解析一个日期段之间的所有日期
*
* @param beginDateStr
* 开始日期
* @param endDateStr
* 结束日期
* @return
*/
public static ArrayList getDayList(String beginDateStr, StringendDateStr) {
//指定要解析的时间格式
SimpleDateFormat f = new SimpleDateFormat("yyyy-MM-dd");

//定义一些变量
Date beginDate = null;
Date endDate = null;

Calendar beginGC = null;
Calendar endGC = null;
ArrayList list = newArrayList();

try {
// 将字符串parse成日期
beginDate = f.parse(beginDateStr);
endDate =f.parse(endDateStr);

// 设置日历
beginGC = Calendar.getInstance();
beginGC.setTime(beginDate);

endGC = Calendar.getInstance();
endGC.setTime(endDate);
SimpleDateFormat sdf = newSimpleDateFormat("yyyy-MM-dd");

// 直到两个时间相同
while(beginGC.getTime().compareTo(endGC.getTime()) <= 0) {

list.add(sdf.format(beginGC.getTime()));
// 以日为单位，增加时间
beginGC.add(Calendar.DAY_OF_MONTH, 1);
}
return list;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

public static ArrayList getYearList() {
ArrayList list = new ArrayList();
Calendar c = null;
c =Calendar.getInstance();
c.setTime(new Date());
int currYear =Calendar.getInstance().get(Calendar.YEAR);

int startYear = currYear - 5;
int endYear = currYear + 10;
for (int i = startYear; i < endYear; i++) {
list.add(new Integer(i));
}
return list;
}

public static int getCurrYear() {
return Calendar.getInstance().get(Calendar.YEAR);
}

/**
* 得到某一年周的总数
*
* @param year
* @return
*/
public static LinkedHashMap getWeekList(int year) {
LinkedHashMap map = newLinkedHashMap();
Calendar c = newGregorianCalendar();
c.set(year, Calendar.DECEMBER,31, 23, 59, 59);
int count = getWeekOfYear(c.getTime());

SimpleDateFormat sdf = newSimpleDateFormat("yyyy-MM-dd");
String dayOfWeekStart ="";
String dayOfWeekEnd ="";
for (int i = 1; i <= count; i++) {
dayOfWeekStart =sdf.format(getFirstDayOfWeek(year, i));
dayOfWeekEnd =sdf.format(getLastDayOfWeek(year, i));
map.put(new Integer(i),"第"+i+"周(从"+dayOfWeekStart + "至" +dayOfWeekEnd+")");
}
return map;

}

/**
* 得到一年的总周数
* @param year
* @return
*/
public static int getWeekCountInYear(int year){
Calendar c = newGregorianCalendar();
c.set(year, Calendar.DECEMBER,31, 23, 59, 59);
int count = getWeekOfYear(c.getTime());
return count;
}

/**
* 取得当前日期是多少周
*
* @param date
* @return
*/
public static int getWeekOfYear(Date date) {
Calendar c = newGregorianCalendar();
c.setFirstDayOfWeek(Calendar.MONDAY);
c.setMinimalDaysInFirstWeek(7);
c.setTime(date);

return c.get(Calendar.WEEK_OF_YEAR);
}

/**
* 得到某年某周的第一天
*
* @param year
* @param week
* @return
*/
public static Date getFirstDayOfWeek(int year, int week) {
Calendar c = newGregorianCalendar();
c.set(Calendar.YEAR,year);
c.set(Calendar.MONTH,Calendar.JANUARY);
c.set(Calendar.DATE,1);

Calendar cal =(GregorianCalendar) c.clone();
cal.add(Calendar.DATE, week *7);

return getFirstDayOfWeek(cal.getTime());
}

/**
* 得到某年某周的最后一天
*
* @param year
* @param week
* @return
*/
public static Date getLastDayOfWeek(int year, int week) {
Calendar c = newGregorianCalendar();
c.set(Calendar.YEAR,year);
c.set(Calendar.MONTH,Calendar.JANUARY);
c.set(Calendar.DATE,1);

Calendar cal =(GregorianCalendar) c.clone();
cal.add(Calendar.DATE, week *7);

return getLastDayOfWeek(cal.getTime());
}

/**
* 得到某年某月的第一天
* @param year
* @param month
* @return
*/
public static Date getFirestDayOfMonth(int year,int month){
month = month-1;
Calendar c= Calendar.getInstance();
c.set(Calendar.YEAR,year);
c.set(Calendar.MONTH,month);

int day = c.getActualMinimum(c.DAY_OF_MONTH);

c.set(Calendar.DAY_OF_MONTH,day);
return c.getTime();

}

/**
* 提到某年某月的最后一天
* @param year
* @param month
* @return
*/
public static Date getLastDayOfMonth(int year,int month){
month = month-1;
Calendar c= Calendar.getInstance();
c.set(Calendar.YEAR,year);
c.set(Calendar.MONTH,month);
int day = c.getActualMaximum(c.DAY_OF_MONTH);
c.set(Calendar.DAY_OF_MONTH,day);
return c.getTime();
}

/**
* 取得当前日期所在周的第一天
*
* @param date
* @return
*/
public static Date getFirstDayOfWeek(Date date) {
Calendar c = newGregorianCalendar();
c.setFirstDayOfWeek(Calendar.MONDAY);
c.setTime(date);
c.set(Calendar.DAY_OF_WEEK,c.getFirstDayOfWeek()); // Monday
returnc.getTime();
}

/**
* 取得当前日期所在周的最后一天
*
* @param date
* @return
*/
public static Date getLastDayOfWeek(Date date) {
Calendar c = newGregorianCalendar();
c.setFirstDayOfWeek(Calendar.MONDAY);
c.setTime(date);
c.set(Calendar.DAY_OF_WEEK,c.getFirstDayOfWeek() + 6); // Sunday
returnc.getTime();
}

}