日期获取方式

import java.text.ParseException;

import java.text.ParsePosition;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.Calendar;

import java.util.Date;

import java.util.GregorianCalendar;

import java.util.List;

import java.util.Locale;

/**

* @author cxn

* 2016年3月23日

日期工具类

*/

public class DateUtil {

private static final int FIRST_DAY = Calendar.MONDAY;

// 获取本月第一天日期

public static String getTimesMonthmorning() {

SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd");

Calendar calendar = Calendar.getInstance();

Date theDate = calendar.getTime();

GregorianCalendar gcLast = (GregorianCalendar) Calendar.getInstance();

gcLast.setTime(theDate);

// 设置为第一天

gcLast.set(Calendar.DAY_OF_MONTH, 1);

String day_first = sf.format(gcLast.getTime());

return day_first;

}

// 获取本月最后一天日期

public static String getTimesMonthLast() {

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");

Calendar ca = Calendar.getInstance();

ca.set(Calendar.DAY_OF_MONTH, ca.getActualMaximum(Calendar.DAY_OF_MONTH));

String last = format.format(ca.getTime());

return last;

}

// 获取本周的星期一的日期

public static String getTimesWeekfirst() {

Calendar cal = Calendar.getInstance();

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");

cal.setFirstDayOfWeek(Calendar.MONDAY);

cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY); // 获取本周一的日期

return df.format(cal.getTime());

}

// 获取本周星期天的日期

public static String getTimesWeeklast() {

Calendar cal = Calendar.getInstance();

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");

cal.setFirstDayOfWeek(Calendar.MONDAY);

cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);

return df.format(cal.getTime());

}

// 计算目前是一年中的第几周

public static int week() {

Calendar cal = Calendar.getInstance(Locale.CHINA); // 实例化cal

cal.setFirstDayOfWeek(Calendar.MONDAY);

int week = cal.get(Calendar.WEEK_OF_YEAR);

return week;

}

// 计算今年的年份

public static int year() {

Calendar cal = Calendar.getInstance(Locale.CHINA); // 实例化cal

cal.setFirstDayOfWeek(Calendar.MONDAY);

int year = cal.get(Calendar.YEAR);

return year;

}

// 计算当前的月份

public static int month() {

Calendar cal = Calendar.getInstance(Locale.CHINA); // 实例化cal

cal.setFirstDayOfWeek(Calendar.MONDAY);

return cal.get(Calendar.MONTH) + 1;

}

// 获取本周第星期一的日期 date 类型

public static Date convertWeekByDate(Date time) {

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); // 设置时间格式

Calendar cal = Calendar.getInstance();

cal.setTime(time);

// 判断要计算的日期是否是周日，如果是则减一天计算周六的，否则会出问题，计算到下一周去了

int dayWeek = cal.get(Calendar.DAY_OF_WEEK);// 获得当前日期是一个星期的第几天

if (1 == dayWeek) {

cal.add(Calendar.DAY_OF_MONTH, -1);

}

cal.setFirstDayOfWeek(Calendar.MONDAY);// 设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一

int day = cal.get(Calendar.DAY_OF_WEEK);// 获得当前日期是一个星期的第几天

cal.add(Calendar.DATE, cal.getFirstDayOfWeek() - day);// 根据日历的规则，给当前日期减去星期几与一个星期第一天的差值

String imptimeBegin = sdf.format(cal.getTime());

cal.add(Calendar.DATE, 6);

try {

Date date = sdf.parse(imptimeBegin);

return date;

} catch (ParseException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return null;

}

// 计算当前年的开始日期

public static String getCurrentYearStartTime() {

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar c = Calendar.getInstance();

String now = null;

try {

c.set(Calendar.MONTH, 0);

c.set(Calendar.DATE, 1);

now = sdf.format(c.getTime());

} catch (Exception e) {

e.printStackTrace();

}

return now;

}

// 计算当前年的结束日期

public static String getCurrentYearEndTime() {

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar c = Calendar.getInstance();

String now = null;

try {

c.set(Calendar.MONTH, 11);

c.set(Calendar.DATE, 31);

now = sdf.format(c.getTime());

} catch (Exception e) {

e.printStackTrace();

}

return now;

}

// 计算当前季度的开始日期

public static String getCurrentQuarterStartTime() {

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar c = Calendar.getInstance();

int currentMonth = c.get(Calendar.MONTH) + 1;

String now = null;

try {

if (currentMonth >= 1 && currentMonth <= 3)

c.set(Calendar.MONTH, 0);

else if (currentMonth >= 4 && currentMonth <= 6)

c.set(Calendar.MONTH, 3);

else if (currentMonth >= 7 && currentMonth <= 9)

c.set(Calendar.MONTH, 4);

else if (currentMonth >= 10 && currentMonth <= 12)

c.set(Calendar.MONTH, 9);

c.set(Calendar.DATE, 1);

now = sdf.format(c.getTime());

} catch (Exception e) {

e.printStackTrace();

}

return now;

}

//计算当前季度的結束日期

public static String getCurrentQuarterEndTime() {

Calendar c = Calendar.getInstance();

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

int currentMonth = c.get(Calendar.MONTH) + 1;

String now = null;

try {

if (currentMonth >= 1 && currentMonth <= 3) {

c.set(Calendar.MONTH, 2);

c.set(Calendar.DATE, 31);

} else if (currentMonth >= 4 && currentMonth <= 6) {

c.set(Calendar.MONTH, 5);

c.set(Calendar.DATE, 30);

} else if (currentMonth >= 7 && currentMonth <= 9) {

c.set(Calendar.MONTH, 8);

c.set(Calendar.DATE, 30);

} else if (currentMonth >= 10 && currentMonth <= 12) {

c.set(Calendar.MONTH, 11);

c.set(Calendar.DATE, 31);

}

now = sdf.format(c.getTime());

} catch (Exception e) {

e.printStackTrace();

}

return now;

}

// 获取任意一天的日期

public static Date getDate(Date date) {

Calendar calendar = Calendar.getInstance();

calendar.setTime(date);

calendar.add(Calendar.DAY_OF_MONTH, 1);

Date date1 = new Date(calendar.getTimeInMillis());

return date1;

}

//獲取當前日期季度

public static Integer getCurrentQuarter() {

Calendar c = Calendar.getInstance();

int currentMonth = c.get(Calendar.MONTH) + 1;

Integer now = 0;

if (currentMonth >= 1 && currentMonth <= 3) {

now = 1;

} else if (currentMonth >= 4 && currentMonth <= 6) {

now = 2;

} else if (currentMonth >= 7 && currentMonth <= 9) {

now = 3;

} else if (currentMonth >= 10 && currentMonth <= 12) {

now = 4;

}

return now;

}

//數字日期和月份的轉化

public static String getMonth(Integer month) {

String mon = null;

if (month == 1) {

mon = "一月份";

} else if (month == 2) {

mon = "二月份";

} else if (month == 3) {

mon = "三月份";

} else if (month == 4) {

mon = "四月份";

} else if (month == 5) {

mon = "五月份";

} else if (month == 6) {

mon = "六月份";

} else if (month == 7) {

mon = "七月份";

} else if (month == 8) {

mon = "八月份";

} else if (month == 9) {

mon = "九月份";

} else if (month == 10) {

mon = "十月份";

} else if (month == 11) {

mon = "十一月份";

} else if (month == 12) {

mon = "十二月份";

}

return mon;

}

//計算本週的週一到周七的所有日期時間

public static List<String> getWeekdays() {

Calendar calendar = Calendar.getInstance();

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");

while (calendar.get(Calendar.DAY_OF_WEEK) != FIRST_DAY) {

calendar.add(Calendar.DATE, -1);

}

List<String> list = new ArrayList<String>();

// setToFirstDay(calendar);

for (int i = 0; i < 7; i++) {

// System.out.println(df.format(calendar.getTime()));

list.add(df.format(calendar.getTime()));

calendar.add(Calendar.DATE, 1);

}

return list;

}

//傳進去的d的日期的後6天的日期

public static String getlast(String d) {

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Date dt = (Date) sdf.parse(d, new ParsePosition(0));

Calendar rightNow = Calendar.getInstance();

rightNow.setTime(dt);

rightNow.add(Calendar.DATE, 6);// 你要加减的日期

Date dt1 = (Date) rightNow.getTime();

String da = sdf.format(dt1);

return da;

}

// 计算2个日期之间相差的天数

public static int daysBetween(Date smdate, Date bdate) {

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

try {

smdate = sdf.parse(sdf.format(smdate));

bdate = sdf.parse(sdf.format(bdate));

} catch (ParseException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

Calendar cal = Calendar.getInstance();

cal.setTime(smdate);

long time1 = cal.getTimeInMillis();

cal.setTime(bdate);

long time2 = cal.getTimeInMillis();

long between_days = (time2 - time1) / (1000 * 3600 * 24);

return Integer.parseInt(String.valueOf(between_days));

}

}