Android Calendar的学习与运用
[java]
mport java.text.DateFormat;
import
java.text.ParsePosition;
import java.text.SimpleDateFormat;
import
java.util.Calendar;
import java.util.Date;
import
java.util.GregorianCalendar;
/**
* Android Calendar的运用
* @author
Administrator
*
*/
public class CalendarUtil {
private
int weeks = 0;// 用来全局控制 上一周，本周，下一周的周数变化
private int MaxDate; //
一月最大天数
private int MaxYear; // 一年最大天数
public static
void main(String[] args) {
CalendarUtil tt = new
CalendarUtil();
System.out.println("获取当天日期:" +
tt.getNowTime("yyyy-MM-dd"));
System.out.println("获取本周一日期:" +
tt.getMondayOFWeek());
System.out.println("获取本周日的日期:" +
tt.getCurrentWeekday());
System.out.println("获取上周一日期:" +
tt.getPreviousWeekday());
System.out.println("获取上周日日期:" +
tt.getPreviousWeekSunday());
System.out.println("获取下周一日期:" +
tt.getNextMonday());
System.out.println("获取下周日日期:" +
tt.getNextSunday());
System.out.println("获得相应周的周六的日期:" +
tt.getNowTime("yyyy-MM-dd"));
System.out.println("获取本月第一天日期:" +
tt.getFirstDayOfMonth());
System.out.println("获取本月最后一天日期:" +
tt.getDefaultDay());
System.out.println("获取上月第一天日期:" +
tt.getPreviousMonthFirst());
System.out.println("获取上月最后一天的日期:" +
tt.getPreviousMonthEnd());
System.out.println("获取下月第一天日期:" +
tt.getNextMonthFirst());
System.out.println("获取下月最后一天日期:" +
tt.getNextMonthEnd());
System.out.println("获取本年的第一天日期:" +
tt.getCurrentYearFirst());
System.out.println("获取本年最后一天日期:" +
tt.getCurrentYearEnd());
System.out.println("获取去年的第一天日期:" +
tt.getPreviousYearFirst());
System.out.println("获取去年的最后一天日期:" +
tt.getPreviousYearEnd());
System.out.println("获取明年第一天日期:" +
tt.getNextYearFirst());
System.out.println("获取明年最后一天日期:" +
tt.getNextYearEnd());
System.out.println("获取本季度第一天:" +
tt.getThisSeasonFirstTime(11));
System.out.println("获取本季度最后一天:" +
tt.getThisSeasonFinallyTime(11));
System.out.println("获取两个日期之间间隔天数2008-12-1~2008-9.29:"
+
CalendarUtil.getTwoDay("2008-12-1", "2008-9-29"));
System.out.println("获取当前月的第几周：" + tt.getWeekOfMonth());
System.out.println("获取当前年份：" + tt.getYear());
System.out.println("获取当前月份：" + tt.getMonth());
System.out.println("获取今天在本年的第几天：" + tt.getDayOfYear());
System.out.println("获得今天在本月的第几天(获得当前日)：" + tt.getDayOfMonth());
System.out.println("获得今天在本周的第几天：" + tt.getDayOfWeek());
System.out.println("获得半年后的日期："
+
tt.convertDateToString(tt.getTimeYearNext()));
}
public static int getYear() {
return
Calendar.getInstance().get(Calendar.YEAR);
}
public static int getMonth() {
return
Calendar.getInstance().get(Calendar.MONTH) + 1;
}
public static int getDayOfYear() {
return
Calendar.getInstance().get(Calendar.DAY_OF_YEAR);
}
public static int getDayOfMonth() {
return
Calendar.getInstance().get(Calendar.DAY_OF_MONTH);
}
public static int getDayOfWeek() {
return
Calendar.getInstance().get(Calendar.DAY_OF_WEEK);
}
public static int getWeekOfMonth() {
return
Calendar.getInstance().get(Calendar.DAY_OF_WEEK_IN_MONTH);
}
public static Date getTimeYearNext() {
Calendar.getInstance().add(Calendar.DAY_OF_YEAR, 183);
return
Calendar.getInstance().getTime();
}
public static
String convertDateToString(Date dateTime) {
SimpleDateFormat df =
new SimpleDateFormat("yyyy-MM-dd");
return
df.format(dateTime);
}
public static String
getTwoDay(String sj1, String sj2) {
SimpleDateFormat myFormatter =
new SimpleDateFormat("yyyy-MM-dd");
long day = 0;
try
{
java.util.Date date = myFormatter.parse(sj1);
java.util.Date mydate = myFormatter.parse(sj2);
day =
(date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
} catch
(Exception e) {
return "";
}
return day
+ "";
}
public static String getWeek(String sdate)
{
// 再转换为时间
Date date =
CalendarUtil.strToDate(sdate);
Calendar c =
Calendar.getInstance();
c.setTime(date);
// int
hour=c.get(Calendar.DAY_OF_WEEK);
// hour中存的就是星期几了，其范围
1~7
// 1=星期日 7=星期六，其他类推
return new
SimpleDateFormat("EEEE").format(c.getTime());
}
public static Date strToDate(String strDate) {
SimpleDateFormat
formatter = new SimpleDateFormat("yyyy-MM-dd");
ParsePosition pos =
new ParsePosition(0);
Date strtodate = formatter.parse(strDate,
pos);
return strtodate;
}
public
static long getDays(String date1, String date2) {
if (date1 == null
|| date1.equals(""))
return 0;
if (date2 == null ||
date2.equals(""))
return 0;
// 转换为标准时间
SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
java.util.Date date = null;
java.util.Date mydate =
null;
try {
date =
myFormatter.parse(date1);
mydate =
myFormatter.parse(date2);
} catch (Exception e) {
}
long day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 *
1000);
return day;
}
public String
getDefaultDay() {
String str = "";
SimpleDateFormat sdf
= new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate =
Calendar.getInstance();
lastDate.set(Calendar.DATE, 1);//
设为当前月的1号
lastDate.add(Calendar.MONTH, 1);//
加一个月，变为下月的1号
lastDate.add(Calendar.DATE, -1);//
减去一天，变为当月最后一天
str =
sdf.format(lastDate.getTime());
return str;
}
public String getPreviousMonthFirst() {
String str = "";
SimpleDateFormat sdf = new
SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate =
Calendar.getInstance();
lastDate.set(Calendar.DATE, 1);//
设为当前月的1号
lastDate.add(Calendar.MONTH, -1);//
减一个月，变为下月的1号
//
lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天
str =
sdf.format(lastDate.getTime());
return str;
}
public String getFirstDayOfMonth() {
String
str = "";
SimpleDateFormat sdf = new
SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate =
Calendar.getInstance();
lastDate.set(Calendar.DATE, 1);//
设为当前月的1号
str = sdf.format(lastDate.getTime());
return
str;
}
public String getCurrentWeekday()
{
weeks = 0;
int mondayPlus =
this.getMondayPlus();
GregorianCalendar currentDate = new
GregorianCalendar();
currentDate.add(GregorianCalendar.DATE,
mondayPlus + 6);
Date monday =
currentDate.getTime();
DateFormat df =
DateFormat.getDateInstance();
String preMonday =
df.format(monday);
return preMonday;
}
public String getNowTime(String dateformat) {
Date now = new
Date();
SimpleDateFormat dateFormat = new
SimpleDateFormat(dateformat);// 可以方便地修改日期格式
String hehe =
dateFormat.format(now);
return hehe;
}
private int getMondayPlus() {
Calendar cd =
Calendar.getInstance();
//
获得今天是一周的第几天，星期日是第一天，星期二是第二天......
int dayOfWeek =
cd.get(Calendar.DAY_OF_WEEK) - 1; // 因为按中国礼拜一作为第一天所以这里减1
if
(dayOfWeek == 1) {
return 0;
} else
{
return 1 - dayOfWeek;
}
}
public String getMondayOFWeek() {
weeks =
0;
int mondayPlus = this.getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus);
Date monday =
currentDate.getTime();
DateFormat df =
DateFormat.getDateInstance();
String preMonday =
df.format(monday);
return preMonday;
}
public String getSaturday() {
int mondayPlus =
this.getMondayPlus();
GregorianCalendar currentDate = new
GregorianCalendar();
currentDate.add(GregorianCalendar.DATE,
mondayPlus + 7 * weeks + 6);
Date monday =
currentDate.getTime();
DateFormat df =
DateFormat.getDateInstance();
String preMonday =
df.format(monday);
return preMonday;
}
public String getPreviousWeekSunday() {
weeks = 0;
weeks--;
int mondayPlus = this.getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus + weeks);
Date
monday = currentDate.getTime();
DateFormat df =
DateFormat.getDateInstance();
String preMonday =
df.format(monday);
return preMonday;
}
public String getPreviousWeekday() {
weeks--;
int
mondayPlus = this.getMondayPlus();
GregorianCalendar currentDate =
new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE,
mondayPlus + 7 * weeks);
Date monday =
currentDate.getTime();
DateFormat df =
DateFormat.getDateInstance();
String preMonday =
df.format(monday);
return preMonday;
}
public String getNextMonday() {
weeks++;
int mondayPlus
= this.getMondayPlus();
GregorianCalendar currentDate = new
GregorianCalendar();
currentDate.add(GregorianCalendar.DATE,
mondayPlus + 7);
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday =
df.format(monday);
return preMonday;
}
public String getNextSunday() {
int mondayPlus =
this.getMondayPlus();
GregorianCalendar currentDate = new
GregorianCalendar();
currentDate.add(GregorianCalendar.DATE,
mondayPlus + 7 + 6);
Date monday =
currentDate.getTime();
DateFormat df =
DateFormat.getDateInstance();
String preMonday =
df.format(monday);
return preMonday;
}
private
int getMonthPlus() {
Calendar cd =
Calendar.getInstance();
int monthOfNumber =
cd.get(Calendar.DAY_OF_MONTH);
cd.set(Calendar.DATE, 1);//
把日期设置为当月第一天
cd.roll(Calendar.DATE, -1);//
日期回滚一天，也就是最后一天
MaxDate = cd.get(Calendar.DATE);
if
(monthOfNumber == 1) {
return -MaxDate;
} else
{
return 1 - monthOfNumber;
}
}
public String getPreviousMonthEnd() {
String
str = "";
SimpleDateFormat sdf = new
SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate =
Calendar.getInstance();
lastDate.add(Calendar.MONTH, -1);//
减一个月
lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天
lastDate.roll(Calendar.DATE, -1);// 日期回滚一天，也就是本月最后一天
str =
sdf.format(lastDate.getTime());
return str;
}
public String getNextMonthFirst() {
String
str = "";
SimpleDateFormat sdf = new
SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate =
Calendar.getInstance();
lastDate.add(Calendar.MONTH, 1);//
减一个月
lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天
str
= sdf.format(lastDate.getTime());
return str;
}
public String getNextMonthEnd() {
String str
= "";
SimpleDateFormat sdf = new
SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate =
Calendar.getInstance();
lastDate.add(Calendar.MONTH, 1);//
加一个月
lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天
lastDate.roll(Calendar.DATE, -1);// 日期回滚一天，也就是本月最后一天
str =
sdf.format(lastDate.getTime());
return str;
}
public String getNextYearEnd() {
String str
= "";
SimpleDateFormat sdf = new
SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate =
Calendar.getInstance();
lastDate.add(Calendar.YEAR, 1);//
加一个年
lastDate.set(Calendar.DAY_OF_YEAR, 1);
lastDate.roll(Calendar.DAY_OF_YEAR, -1);
str =
sdf.format(lastDate.getTime());
return str;
}
public String getNextYearFirst() {
String
str = "";
SimpleDateFormat sdf = new
SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate =
Calendar.getInstance();
lastDate.add(Calendar.YEAR, 1);//
加一个年
lastDate.set(Calendar.DAY_OF_YEAR, 1);
str =
sdf.format(lastDate.getTime());
return str;
}
private int getMaxYear() {
Calendar cd =
Calendar.getInstance();
cd.set(Calendar.DAY_OF_YEAR, 1);//
把日期设为当年第一天
cd.roll(Calendar.DAY_OF_YEAR, -1);//
把日期回滚一天。
int MaxYear = cd.get(Calendar.DAY_OF_YEAR);
return MaxYear;
}
private int getYearPlus() {
Calendar cd = Calendar.getInstance();
int yearOfNumber =
cd.get(Calendar.DAY_OF_YEAR);// 获得当天是一年中的第几天
cd.set(Calendar.DAY_OF_YEAR, 1);// 把日期设为当年第一天
cd.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滚一天。
int MaxYear =
cd.get(Calendar.DAY_OF_YEAR);
if (yearOfNumber == 1)
{
return -MaxYear;
} else {
return 1
- yearOfNumber;
}
}
public String
getCurrentYearFirst() {
int yearPlus =
this.getYearPlus();
GregorianCalendar currentDate = new
GregorianCalendar();
currentDate.add(GregorianCalendar.DATE,
yearPlus);
Date yearDay = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preYearDay =
df.format(yearDay);
return preYearDay;
}
//
获得本年最后一天的日期 *
public String getCurrentYearEnd() {
Date date
= new Date();
SimpleDateFormat dateFormat = new
SimpleDateFormat("yyyy");// 可以方便地修改日期格式
String years =
dateFormat.format(date);
return years + "-12-31";
}
// 获得上年第一天的日期 *
public String getPreviousYearFirst()
{
Date date = new Date();
SimpleDateFormat dateFormat =
new SimpleDateFormat("yyyy");// 可以方便地修改日期格式
String years =
dateFormat.format(date);
int years_value =
Integer.parseInt(years);
years_value--;
return
years_value + "-1-1";
}
// 获得上年最后一天的日期
public
String getPreviousYearEnd() {
weeks--;
int yearPlus =
this.getYearPlus();
GregorianCalendar currentDate = new
GregorianCalendar();
currentDate.add(GregorianCalendar.DATE,
yearPlus + MaxYear * weeks
+ (MaxYear - 1));
Date yearDay = currentDate.getTime();
DateFormat df =
DateFormat.getDateInstance();
String preYearDay =
df.format(yearDay);
return preYearDay;
}
public String getThisSeasonFirstTime(int month)
{
int array[][] = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 }, { 10, 11,
12 } };
int season = 1;
if (month >= 1 &&
month <= 3) {
season = 1;
}
if (month
>= 4 && month <= 6) {
season = 2;
}
if (month >= 7 && month <= 9) {
season = 3;
}
if (month >= 10 && month <=
12) {
season = 4;
}
int start_month =
array[season - 1][0];
int end_month = array[season -
1][2];
Date date = new Date();
SimpleDateFormat
dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式
String
years = dateFormat.format(date);
int years_value =
Integer.parseInt(years);
int start_days = 1;//
years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month);
int end_days = getLastDayOfMonth(years_value, end_month);
String
seasonDate = years_value + "-" + start_month + "-" + start_days;
return seasonDate;
}
public String
getThisSeasonFinallyTime(int month) {
int array[][] = { { 1, 2, 3 },
{ 4, 5, 6 }, { 7, 8, 9 }, { 10, 11, 12 } };
int season =
1;
if (month >= 1 && month <= 3) {
season = 1;
}
if (month >= 4 && month <=
6) {
season = 2;
}
if (month >= 7
&& month <= 9) {
season = 3;
}
if (month >= 10 && month <= 12) {
season = 4;
}
int start_month = array[season -
1][0];
int end_month = array[season - 1][2];
Date
date = new Date();
SimpleDateFormat dateFormat = new
SimpleDateFormat("yyyy");// 可以方便地修改日期格式
String years =
dateFormat.format(date);
int years_value =
Integer.parseInt(years);
int start_days = 1;//
years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month);
int end_days = getLastDayOfMonth(years_value, end_month);
String
seasonDate = years_value + "-" + end_month + "-" + end_days;
return
seasonDate;
}
private int getLastDayOfMonth(int year, int month) {
if (month == 1
|| month == 3 || month == 5 || month == 7 || month == 8
||
month == 10 || month == 12) {
return 31;
}
if (month == 4 || month == 6 || month == 9 || month == 11)
{
return 30;
}
if (month == 2)
{
if (isLeapYear(year)) {
return
29;
} else {
return 28;
}
}
return 0;
}
public
boolean isLeapYear(int year) {
return (year % 4 == 0 && year
% 100 != 0) || (year % 400 == 0);
}
public boolean
isLeapYear2(int year) {
return new
GregorianCalendar().isLeapYear(year);
}
}
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