---数据库中的Date类型有：
传入数据库中用作查询条件的date参数是String类型的
http://windshome.iteye.com/blog/1871058
http://blog.csdn.net/binbinxyz/article/details/8557558
---Java中的Date：
Java语言的Calendar(日历),Date(日期)和DateFormat(日期格式)组成了Java标准的一个基本但是非常重要的部分.
年：from 1900
月：from 0 to 11
周：起始为周日,0
--Date:
Date date = new Date();
System.out.println(date); // Fri Mar 02 22:38:41 CST 2012
System.out.println(date.getTime()); // getTime：毫秒数，1330699121772
--Calendar:
GregorianCalendar calendar = new GregorianCalendar();
//calendar.set(2012, Calendar.NOVEMBER, 15, 18, 23,55);
calendar.setTime(date);
Date curDay = calendar.getTime(); //Calendar转成Date：Thu May 08 11:55:38 CST 2014
--new Date()：从1970年1月1日开始经历的毫秒数:
System.currentTimeMillis();
--格式化显示日期：
// 采用SimpleDateFormat
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
sdf.format(new Date());//格式化显示日期
sdf.parse("2014-01-01");//将字符串解析化成Date
// 采用DateFormat
DateFormat.getDateInstance(int dateStyle).format(date);//Date
DateFormat.getDateTimeInstance(int dateStyle, int timeStyle).format(date);//DateTime
--处理Calendar的set(),get(),add(),roll()
//设置和获取日期数据的特定部分:
Calendar cal=Calendar.getInstance();
Integer y = cal.get(Calendar.YEAR);
//取值
Integer m = cal.get(Calendar.MONTH) + 1;
Integer d = cal.get(Calendar.DATE);
cal.set(Calendar.YEAR, 2006);
//设值
cal.set(Calendar.MONTH, 8);
cal.set(Calendar.DAY_OF_MONTH, 3);
GregorianCalendar calendar = new GregorianCalendar();
calendar.setTime(date);// 指定日期为当前日期
System.out.println("System Date: " + calendar.getTime()); //date:Thu May 08 13:50:32 CST 2014
calendar.clear();
//在使用set方法之前，必须先clear一下，否则很多信息会继承自系统当前时间
calendar.set(GregorianCalendar.DAY_OF_WEEK, GregorianCalendar.FRIDAY);// 指定日期为当前周的星期五
calendar.set(Calendar.DATE, 1);
// 设置当前月的1号
//calendar.add(Calendar.MONDAY, -1);
// 减一个月，变为上月的1号
calendar.add(Calendar.MONDAY, 1);
// 加一个月，变为下月的1号
calendar.add(Calendar.DATE, -1);
// 减去一天，变为当前月的最后一天
calendar.add(GregorianCalendar.DAY_OF_MONTH, 7);//add 方法让我们能够在日期上加减数值推进时间，润年的所有复杂的计算都由这个方法自动处理
//set(),add()方法中，YEAR,MONTH,DATE是可以分离开设置的，
calendar.set(Calendar.DAY_OF_YEAR, 1);
// 设置当年第一天
calendar.get(Calendar.YEAR) + "-12-31";
// 获取本年的最后一天
/* 本年的最后一天
or：
calendar.add(Calendar.YEAR, 1);//加一年
calendar.set(Calendar.DAY_OF_YEAR, 1);
//设置为年的第一天
calendar.add(Calendar.DAY_OF_YEAR, -1);//减一天
*/
(calendar.get(Calendar.YEAR) - 1) + "-01-01";
// 获取上年的第一天
calendar.roll(Calendar.DAY_OF_YEAR, -1);
// 把日期回滚一天
calendar.getTime(); //获取到日期
//计算两个日期的距离天数，分别通过date.getTime()并相减得出间隔毫秒数，再将毫秒数转换成天数
--Calendar和Date的转化
(1) Calendar转化为Date
Calendar cal=Calendar.getInstance();
Date date=cal.getTime();
(2) Date转化为Calendar
Date date=new Date();
Calendar cal=Calendar.getInstance();
cal.setTime(date);
--roll-链接：http://blog.sina.com.cn/s/blog_62c89b450100sau9.html
roll()函数处理，只会比相应的字段进行处理，不会智能的对其它字段也进行逻辑上的改变。但是add()函数会在逻辑上改变其它字段，使结果正确。
链接：http://www.iteye.com/topic/218271
public class DateCalendarStudyDemo {
/**
* 格式化显示日期、解析日期字符串成Date。
* SimpleDateFormat;
* DateFormat.getDateInstance(int dateStyle);
* DateFormat.getDateTimeInstance(int dateStyle, int timeStyle);
*
* @author mao
*/
public static void formatOrParseStringDate() throws Exception {
// 采用SimpleDateFormat
if (true) {
SimpleDateFormat sdf = new SimpleDateFormat("MM-dd-yyyy");
System.out.println("05-20-2014: " + sdf.format(new Date()));//格式化
Date date = sdf.parse("06-20-2014");//解析成Date
System.out.println("date: " + date.getTime());
}
// 采用DateFormat
if (true) {
String strDate = null;
Date date = new Date();
System.out.println("Tue May 20 00:24:28 CST 2014: " + date);
//Date DateFormat.getDateInstance(int dateStyle)
strDate = DateFormat.getDateInstance().format(date);
System.out.println("2014-5-8 : " + strDate);
strDate = DateFormat.getDateInstance(DateFormat.DEFAULT).format(date);
System.out.println("2014-5-8 : " + strDate);
strDate = DateFormat.getDateInstance(DateFormat.SHORT).format(date);
System.out.println("14-5-8 : " + strDate);
strDate = DateFormat.getDateInstance(DateFormat.MEDIUM).format(date);
System.out.println("2014-5-8 : " + strDate);
strDate = DateFormat.getDateInstance(DateFormat.LONG).format(date);
System.out.println("2014年5月8日 : " + strDate);
strDate = DateFormat.getDateInstance(DateFormat.FULL).format(date);
System.out.println("2014年5月8日 星期四: " + strDate);
//DateTime DateFormat.getDateTimeInstance(int dateStyle, int timeStyle)
strDate = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT).format(date);
System.out.println("2014-5-8 10:30:31: " + strDate);
strDate = DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT).format(date);
System.out.println("14-5-8 上午10:30: " + strDate);
strDate = DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.MEDIUM).format(date);
System.out.println("2014-5-8 10:30:31: " + strDate);
strDate = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.LONG).format(date);
System.out.println("2014年5月8日 上午10时30分31秒: " + strDate);
strDate = DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL).format(date);
System.out.println("2014年5月8日 星期四 上午10时30分31秒 CST: " + strDate);
}
}
/**
* 获取yyyy-MM-dd HH:mm:ss中的指定部分
*
* @author mao
*/
public static void getPartOfYYYYMMDD() throws Exception {
Calendar c = Calendar.getInstance();
System.out.println("年: " + c.get(Calendar.YEAR));
String m = (c.get(Calendar.MONTH) + 1)+"";//月份要加1; 5月份只会显示5，不会显示05，需手动加上
System.out.println("月(d): " + m );
SimpleDateFormat sdf = new SimpleDateFormat("dd");
Date month = sdf.parse(m);
System.out.println("月(dd): " + sdf.format(month));
System.out.println("日: " + c.get(Calendar.DAY_OF_MONTH));
System.out.println("时: " + c.get(Calendar.HOUR_OF_DAY));
System.out.println("分: " + c.get(Calendar.MINUTE));
System.out.println("秒: " + c.get(Calendar.SECOND));
System.out.println("当前时间毫秒数：" + c.getTimeInMillis());
System.out.println(c.getTime());
Date d = new Date();
System.out.println("Java Date： "+d);
SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
System.out.println("格式化后的日期：" + sdf2.format(d));//Date转String
String str = "2012-1-13 17:26:33";
System.out.println("字符串转成日期：" + sdf2.parse(str));//String解析成Date
}
/**
* 通过Calendar设置日期变动
* 主要API：set(),get(),add().
*
* @author mao
*/
public static void setCalendarTime() throws Exception {
Date date = new Date();
DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.FULL);
GregorianCalendar calendar = new GregorianCalendar();
calendar.setTime(date);// 设置为当前日期
System.out.println("System Date: " + calendar.getTime());
calendar.set(GregorianCalendar.DAY_OF_WEEK, GregorianCalendar.FRIDAY);// 设置为day_of_week的星期五，每周从周日开始算
System.out.println("Day of Week to Friday: " + dateFormat.format(calendar.getTime()));
int friday13Counter = 0;//计算接下来每月的13号是星期五的前十个日期
while (friday13Counter < 10) {
calendar.add(GregorianCalendar.DAY_OF_MONTH, 7);//add 方法让我们能够在日期上加上数值，润年的所有复杂的计算都由这个方法自动处理
//System.out.println(dateFormat.format(calendar.getTime()));
if (calendar.get(GregorianCalendar.DAY_OF_MONTH) == 13) {
friday13Counter++;
System.out.println(friday13Counter + " :" + dateFormat.format(calendar.getTime()));
}
}
}
/**
* 获取每月的第一天和最后一天的区域
*
* @author mao
*/
public static void getCurrentFirstAndLastDayOfMonth() throws Exception {
Calendar c = Calendar.getInstance();
Integer y = c.get(Calendar.YEAR);
Integer m = c.get(Calendar.MONTH) + 1;
Integer d = c.get(Calendar.DATE);
Integer d1 = c.get(Calendar.DAY_OF_MONTH);// 一个月的第几天
Integer d3 = c.get(Calendar.DAY_OF_WEEK);// 一周的星期几
Integer d2 = c.get(Calendar.DAY_OF_YEAR);// 一年的第几天
System.out.println(y);
System.out.println(m);
System.out.println(d);
// System.out.println(d1);
// System.out.println(d2);
// System.out.println(d3);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Calendar cal = Calendar.getInstance();//创建Calendar
cal.set(c.get(Calendar.YEAR), c.get(Calendar.MONTH), 1);//当前月的第一天
Date firstDayOfMonth = cal.getTime();//由Calendar转换成Date
System.out.println("first date: " + sdf.format(firstDayOfMonth));
cal.set(c.get(Calendar.YEAR), c.get(Calendar.MONTH)+1, 1, 0, 0, 0);//下个月的第一天
cal.add(Calendar.DAY_OF_MONTH, -1);//往前推一天，即本月最后一天
Date lastDayOfMonth = cal.getTime();
System.out.println("last date: " + sdf.format(lastDayOfMonth));
}
}
/**
*
* @author csdn
*
*/
public class DateCalendarUseDemo {
public static void main(String[] args) {
DateCalendarUseDemo tt = new DateCalendarUseDemo();
System.out.println("\n当前日期： ");
System.out.println(tt.getNowTime()); // 获取当前时间
System.out.println(tt.getNowTime2()); // 获取当前时间
System.out.println(tt.getNowTime3()); // 获取当前时间
System.out.println("\n计算周： ");
System.out.println(tt.getDaysOfNow2SundayInWeek()); // 获取当前日期与本周日的相差天数
System.out.println(tt.getDateOfMondayInWeek()); // 获取本周一的日期
System.out.println(tt.getDateOfSaturdayInWeek()); // 获取本周六的日期
System.out.println(tt.getDateOfSaturdayInNextWeek()); // 获取下周一的日期
System.out.println(tt.getDateOfSaturdayInLastWeek()); // 获取上周六的日期
System.out.println("\n计算月： ");
System.out.println(tt.getFirstDayOfMonth()); // 获取当月的第一天
System.out.println(tt.getLastDayOfMonth()); // 获取当月最后一天
System.out.println(tt.getFirstDayOfPreviousMonth()); // 获取上月第一天
System.out.println(tt.getLastDayOfPreviousMonth()); // 获取上月最后一天
System.out.println(tt.getFirstDayOfNextMonth()); // 获取下月第一天
System.out.println(tt.getLastDayOfNextMonth()); // 获取下月最后一天
System.out.println("\n计算年： ");
System.out.println(tt.getFirstDayOfYear()); // 获取本年的第一天
System.out.println(tt.getLastDayOfYear()); // 获取本年最后一天
System.out.println(tt.getFirstDayOfPreviousYear()); // 获取上年的第一天
System.out.println(tt.getLastDayOfPreviousYear()); // 获取上年最后一天
System.out.println(tt.getFirstDayOfNextYear()); // 获取下年的第一天
System.out.println(tt.getLastDayOfNextYear()); // 获取下年最后一天
System.out.println(tt.getDaysOfYear()); // 获取本年的天数
System.out.println("\n计算季度： ");
System.out.println(tt.getSeasonOfMonth()); // 获取当前月的季度
System.out.println(tt.getLastDayOfNow()); // 获取当前天所在月份的天数
System.out.println(tt.isLeapYear(2012)); // 判断是否是润年
System.out.println("\n日期格式转换与计算： ");
System.out.println(tt.getDateFromStr("2012-06-20")); // 将字符串时间格式 yyyy-MM-dd，转换成Date类型
System.out.println(tt.getWeek("2012-06-20")); // 根据一个日期，返回是星期几的字符串
System.out.print("2012-06-02 --> 2012-06-12 间隔天数: "); // 计算两个日期间的间隔天数
System.out.println(tt.getDaysFromTwoDate("2012-06-02", "2012-06-12"));
}
// 获取当前时间
public String getNowTime() {
SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Date now = new Date();
return sDateFormat.format(now);
}
public String getNowTime2() {
SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date now = new Date(System.currentTimeMillis());
return sDateFormat.format(now);
}
public String getNowTime3() {
StringBuilder strBuildNow = new StringBuilder();
Calendar calendar = Calendar.getInstance();
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH) + 1;
int day = calendar.get(Calendar.DAY_OF_MONTH);
int hour = calendar.get(Calendar.HOUR_OF_DAY);
int minute = calendar.get(Calendar.MINUTE);
int second = calendar.get(Calendar.SECOND);
int millissecond = calendar.get(Calendar.MILLISECOND);
strBuildNow.append(year + "-");
strBuildNow.append(month + "-");
strBuildNow.append(day + " ");
strBuildNow.append(hour + ":");
strBuildNow.append(minute + ":");
strBuildNow.append(second + ".");
strBuildNow.append(millissecond);
return strBuildNow.toString();
}
// 获取当前日期与本周日的相差天数
public int getDaysOfNow2SundayInWeek() {
Calendar calendar = Calendar.getInstance();
int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK) - 1; // 减一天，周一为1，符合中国人习惯。Sunday - 1; Monday - 2; Saturday - 7
if(dayOfWeek == 0) { // 周日
return 0;
} else {
return 0 - dayOfWeek;
}
}
// 获取本周一的日期
public String getDateOfMondayInWeek(){
int day = this.getDaysOfNow2SundayInWeek() + 1; // 加1，即当前日期与本周一的间隔天数
GregorianCalendar gCalendar = new GregorianCalendar();
gCalendar.add(GregorianCalendar.DATE, day); // 计算与本周一相差的时间间隔
Date curDay = gCalendar.getTime();
DateFormat dateFormat = DateFormat.getInstance();
String dateOfMonday = dateFormat.format(curDay);
return dateOfMonday;
}
// 获取本周六的日期
public String getDateOfSaturdayInWeek(){
int day = this.getDaysOfNow2SundayInWeek() + 6; // 加6，即当前日期与本周六的间隔天数
GregorianCalendar gCalendar = new GregorianCalendar();
gCalendar.add(GregorianCalendar.DATE, day); // 计算与本周六相差的时间间隔
Date curDay = gCalendar.getTime();
DateFormat dateFormat = DateFormat.getInstance();
String dateOfMonday = dateFormat.format(curDay);
return dateOfMonday;
}
// 获取上周六的日期
public String getDateOfSaturdayInLastWeek(){
int day = this.getDaysOfNow2SundayInWeek() - 1; // 减1，即当前日期与上周六的间隔天数
GregorianCalendar gCalendar = new GregorianCalendar();
gCalendar.add(GregorianCalendar.DATE, day); // 计算与上周一相差的时间间隔
Date curDay = gCalendar.getTime();
DateFormat dateFormat = DateFormat.getInstance();
String dateOfMonday = dateFormat.format(curDay);
return dateOfMonday;
}
// 获取下周一的日期
public String getDateOfSaturdayInNextWeek(){
int day = this.getDaysOfNow2SundayInWeek() + 8; // 加8，即当前日期与下周一的间隔天数
GregorianCalendar gCalendar = new GregorianCalendar();
gCalendar.add(GregorianCalendar.DATE, day); // 计算与下周一相差的时间间隔
Date curDay = gCalendar.getTime();
DateFormat dateFormat = DateFormat.getInstance();
String dateOfMonday = dateFormat.format(curDay);
return dateOfMonday;
}
// 获取当月第一天
public String getFirstDayOfMonth() {
String strFirstDay = "";
SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DATE, 1); // 设置当前月的1号
strFirstDay = sDateFormat.format(calendar.getTime());
return strFirstDay;
}
// 获取当月最后一天
public String getLastDayOfMonth() {
String strLastDay = "";
SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DATE, 1); // 设置当前月的1号
calendar.add(Calendar.MONDAY, 1); // 加一个月，变为下月的1号
calendar.add(Calendar.DATE, -1); // 减去一天，变为当前月的最后一天
strLastDay = sDateFormat.format(calendar.getTime());
return strLastDay;
}
// 获取上月第一天
public String getFirstDayOfPreviousMonth() {
String strFirstDay = "";
SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DATE, 1); // 设置当前月的1号
calendar.add(Calendar.MONDAY, -1); // 减一个月，变为上月的1号
strFirstDay = sDateFormat.format(calendar.getTime());
return strFirstDay;
}
// 获取上月最后一天
public String getLastDayOfPreviousMonth() {
String strLastDay = "";
SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DATE, 1); // 设置当前月的1号
calendar.add(Calendar.DATE, -1); // 减一天，变为上月的1号
strLastDay = sDateFormat.format(calendar.getTime());
return strLastDay;
}
public String getLastDayOfPreviousMonth2() {
String strLastDay = "";
SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.MONDAY, -1); // 减一个月
calendar.set(Calendar.DATE, 1); // 设置当前月的1号
calendar.roll(Calendar.DATE, -1); // 把日期回滚一天，也就是本月最后一天
strLastDay = sDateFormat.format(calendar.getTime());
return strLastDay;
}
// 获取下月第一天
public String getFirstDayOfNextMonth() {
String strFirstDay = "";
SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.MONTH, 1); // 加一个月
calendar.set(Calendar.DATE, 1); // 设置当前月第一天
strFirstDay = sDateFormat.format(calendar.getTime());
return strFirstDay;
}
// 获取下月最后一天
public String getLastDayOfNextMonth() {
String strLastDay = "";
SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DATE, 1); // 设置当前月的1号
calendar.add(Calendar.MONDAY, 2); // 加两个月，变为下下月的1号
calendar.add(Calendar.DATE, -1); // 减一天，变为下月的最后一天
strLastDay = sDateFormat.format(calendar.getTime());
return strLastDay;
}
public String getLastDayOfNextMonth2(){
String strLastDay = "";
SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.MONTH, 1); // 加1个月
calendar.set(Calendar.DATE, 1); // 把日期设置为当月第1天
calendar.roll(Calendar.DATE, -1); // 日期回滚1天，也就是本月最后1天
strLastDay = sDateFormat.format(calendar.getTime());
return strLastDay;
}
// 获取本年的第一天
public String getFirstDayOfYear(){
String strFirstDay = "";
SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DAY_OF_YEAR, 1); // 设置当年第一天
strFirstDay = sDateFormat.format(calendar.getTime());
return strFirstDay;
}
// 获取本年的最后一天
public String getLastDayOfYear(){
String strLastDay = "";
SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
// strLastDay = calendar.get(Calendar.YEAR) + "-12-31";
calendar.set(Calendar.DAY_OF_YEAR, 1);
calendar.add(Calendar.YEAR, 1);
calendar.add(Calendar.DAY_OF_YEAR, -1);
strLastDay = sDateFormat.format(calendar.getTime());
return strLastDay;
}
// 获取上年的第一天
public String getFirstDayOfPreviousYear(){
String strFirstDay = "";
Calendar calendar = Calendar.getInstance();
strFirstDay = (calendar.get(Calendar.YEAR) - 1) + "-01-01";
return strFirstDay;
}
// 获取上年的最后一天
public String getLastDayOfPreviousYear(){
String strLastDay = "";
Calendar calendar = Calendar.getInstance();
strLastDay = (calendar.get(Calendar.YEAR) - 1) + "-12-31";
return strLastDay;
}
// 获取下年的第一天
public String getFirstDayOfNextYear(){
String strFirstDay = "";
SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.YEAR, 1); // 加一年
calendar.set(Calendar.DAY_OF_YEAR, 1); // 设置当年第一天
strFirstDay = sDateFormat.format(calendar.getTime());
return strFirstDay;
}
// 获取下年的最后一天
public String getLastDayOfNextYear(){
String strLastDay = "";
SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.YEAR, 1); // 加一年
calendar.set(Calendar.DAY_OF_YEAR, 1); // 设置当年第一天
calendar.roll(Calendar.DAY_OF_YEAR, -1); // 回滚到当年最后一天
strLastDay = sDateFormat.format(calendar.getTime());
return strLastDay;
}
// 获取本年的天数
public String getDaysOfYear(){
int year = 0;
int days = 0;
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DAY_OF_YEAR, 1); // 设置日期为当年第一天
calendar.roll(Calendar.DAY_OF_YEAR, -1); // 把日期回滚一天
year = calendar.get(Calendar.YEAR);
days = calendar.get(Calendar.DAY_OF_YEAR);
return (days + " in " + year);
}
// 获取当前月的季度
public String getSeasonOfMonth(){
String strSeason = "";
int year, month, day;
int season = 1;
int array[][] = new int[][]{ {1,2,3}, {4,5,6}, {7,8,9}, {10,11,12} };
Calendar calendar = Calendar.getInstance();
year = calendar.get(Calendar.YEAR);
month = calendar.get(Calendar.MONDAY) + 1;
day = calendar.get(Calendar.DAY_OF_MONTH);
switch (month) {
case 1:
case 2:
case 3:
season = 1;
break;
case 4:
case 5:
case 6:
season = 2;
break;
case 7:
case 8:
case 9:
season = 3;
break;
case 10:
case 11:
case 12:
season = 4;
break;
default:
season = 1;
break;
}
int start_month = array[season-1][0];
int end_month = array[season-1][2];
strSeason = year + "-" + month + "-" +day;
strSeason += " in [ " + year + "-" + start_month + " : " + year + "-" + end_month + " ]";
return strSeason;
}
// 获取当前天所在月份的天数
public String getLastDayOfNow(){
String strLastDay = "";
int year, month, day;
int days = 0;
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DAY_OF_MONTH,1);
calendar.add(Calendar.MONTH, 1);
calendar.add(Calendar.DAY_OF_MONTH, -1);
int daysOfMonth = calendar.get(Calendar.DAY_OF_MONTH);
strLastDay = daysOfMonth + "";
// year = calendar.get(Calendar.YEAR);
// month = calendar.get(Calendar.MONTH) + 1;
// day = calendar.get(Calendar.DAY_OF_MONTH);
//
// switch (month) {
// case 1:
// case 3:
// case 5:
// case 7:
// case 8:
// case 10:
// case 12:
// days = 31;
// break;
// case 4:
// case 6:
// case 9:
// case 11:
// days = 30;
// break;
// case 2:
// if (isLeapYear(year)) {
// days = 29;
// } else {
// days = 28;
// }
// break;
// default:
// days = 0;
// break;
// }
//
// strLastDay = days + " in [ " + year + "-" + month + "-" + day + " ]";
return strLastDay;
}
// 判断是否是润年
public boolean isLeapYear(int year){
return (year%4 == 0 && year%100 != 0) || (year%400 == 0);
}
// 将字符串时间格式 yyyy-MM-dd，转换成Date类型
public Date getDateFromStr(String txtDate) {
SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");
ParsePosition pos = new ParsePosition(0);
Date date = sDateFormat.parse(txtDate, pos);
return date;
}
// 根据一个日期，返回是星期几的字符串
public String getWeek(String txtDate) {
Date date = getDateFromStr(txtDate);
// Calendar calendar = Calendar.getInstance();
// calendar.setTime(date);
String week = new SimpleDateFormat("EEEE").format(date);
return week;
}
// 计算两个日期间的间隔天数
public long getDaysFromTwoDate(String txtDate1, String txtDate2) {
if(txtDate1 == null || txtDate1.equals("")) {
return 0;
}
if(txtDate2 == null || txtDate2.equals("")) {
return 0;
}
SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");
long days = 0;
try {
Date date1 = sDateFormat.parse(txtDate1);
Date date2 = sDateFormat.parse(txtDate2);
days = (date2.getTime() - date1.getTime())/(24*60*60*1000); // 通过getTime()方法，把时间Date转换成毫秒格式Long类型，进行计算
} catch (Exception e) {
System.out.println(e.getMessage());
}
return days;
}
}