calendar
获取当前天的前n天: getTodayPreNDay（int n） 取得月第一天：getFirstDateOfMonth(Date date) 取得月最后一天：getLastDateOfMonth(Date date) 获取当前的季度：getSeason(Date date) 当前季度都包含哪些月份：Date[] getSeasonDate(Date date) 月初1号 当前月有多少天：getDayOfMonth(Date date) 当前月已经过了多少天：getPassDayOfMonth(Date date) 当前月还剩多少天：getRemainDayOfMonth(Date date) 季度的第一天：getFirstDateOfSeason(Date date) 季度的最后一天：etLastDateOfSeason(Date date) 季度一共多少天：getDayOfSeason(Date date) 季度已经过了多少天：getPassDayOfSeason(Date date) 季度还剩下多少天：getRemainDayOfMonth(Date date)
public static void calendar() { Calendar calendar = Calendar.getinstance(); //calendar.add(Calendar.YEAR, 1); //一年后的今天为基准（add具有累加效果） //calendar.add(Calendar.MONTH, 1);// 同理换成下个月的今天（add具有累加效果） calendar.set(Calendar.YEAR, 2000); //直接覆盖年这个字段，其他的去默认值 System.out.println("现在是" + calendar.get(Calendar.YEAR) + "年"); calendar.set(2018, 7, 1);//直接覆盖年月日这个字段，其他的去默认值 int year = calendar.get(Calendar.YEAR); // 获取年 int month = calendar.get(Calendar.MONTH) + 1;// 获取月，这里需要需要月份的范围为0~11，因此获取月份的时候需要+1才是当前月份值 int day = calendar.get(Calendar.DAY_OF_MONTH); // 获取日 int hour = calendar.get(Calendar.HOUR); // 获取时 // int hour = calendar.get(Calendar.HOUR_OF_DAY); // 24小时表示 int minute = calendar.get(Calendar.MINUTE);// 获取分 int second = calendar.get(Calendar.SECOND);// 获取秒 int weekday = calendar.get(Calendar.DAY_OF_WEEK);// 星期，英语国家星期从星期日开始计算（从星期天开始算的,比如，今天是星期三，返回4） System.out.println("现在是" + year + "年" + month + "月" + day + "日" + hour + "时" + minute + "分" + second + "秒" + "星期" + weekday); }
public class TestCalendar {
public static final String YYYY_MM_DD = "yyyy-MM-dd";
public static final String YYYY_MM_DD_HH_MM_SS = "yyyy-MM-dd hh:mm:ss";
public static final String YYYYMMDD = "yyyyMMdd";
public static final String YYYY_MM = "yyyy_MM";
public static final String YYYYMM = "yyyyMM";
public static void main(String[] args) throws Exception{
System.out.println(formatDateToStr(getTodayPreNDay(0)));
System.out.println(formatDateToStr(getTodayPreNDay(1)));
System.out.println(formatDateToStr(getTodayPreNDay(31)));
System.out.println(getmonthInt(new Date()));
System.out.println(getYearInt(new Date()));
System.out.println(formatDateToStr(getFirstDateOfMonth(new Date())));//月初
System.out.println(formatDateToStr(getLastDateOfMonth(new Date())));//月末
}
/**
* 取得季度第一天
*
* @param date
* @return
*/
public static Date getFirstDateOfSeason(Date date) {
return getFirstDateOfMonth(getSeasonDate(date)[0]);
}
/**
* 取得季度最后一天
*
* @param date
* @return
*/
public static Date getLastDateOfSeason(Date date) {
return getLastDateOfMonth(getSeasonDate(date)[2]);
}
/**
* 取得季度天数
*
* @param date
* @return
*/
public static int getDayOfSeason(Date date) {
int day = 0;
Date[] seasonDates = getSeasonDate(date);
for (Date date2 : seasonDates) {
day += getDayOfMonth(date2);
}
return day;
}
/**
* 取得季度剩余天数
*
* @param date
* @return
*/
public static int getRemainDayOfSeason(Date date) {
return getDayOfSeason(date) - getPassDayOfSeason(date);
}
/**
* 取得季度已过天数
*
* @param date
* @return
*/
public static int getPassDayOfSeason(Date date) {
int day = 0;
Date[] seasonDates = getSeasonDate(date);
Calendar c = Calendar.getInstance();
c.setTime(date);
int month = c.get(Calendar.MONTH);
if (month == Calendar.JANUARY || month == Calendar.APRIL
|| month == Calendar.JULY || month == Calendar.OCTOBER) {// 季度第一个月
day = getPassDayOfMonth(seasonDates[0]);
} else if (month == Calendar.FEBRUARY || month == Calendar.MAY
|| month == Calendar.AUGUST || month == Calendar.NOVEMBER) {// 季度第二个月
day = getDayOfMonth(seasonDates[0])
+ getPassDayOfMonth(seasonDates[1]);
} else if (month == Calendar.MARCH || month == Calendar.JUNE
|| month == Calendar.SEPTEMBER || month == Calendar.DECEMBER) {// 季度第三个月
day = getDayOfMonth(seasonDates[0]) + getDayOfMonth(seasonDates[1])
+ getPassDayOfMonth(seasonDates[2]);
}
return day;
}
/**
* 取得月的剩余天数
*
* @param date
* @return
*/
public static int getRemainDayOfMonth(Date date) {
int dayOfMonth = getDayOfMonth(date);
int day = getPassDayOfMonth(date);
return dayOfMonth - day;
}
/**
* 取得月已经过的天数
*
* @param date
* @return
*/
public static int getPassDayOfMonth(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.DAY_OF_MONTH);
}
/**
* 取得月天数
*
* @param date
* @return
*/
public static int getDayOfMonth(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.getActualMaximum(Calendar.DAY_OF_MONTH);
}
/**
* 取得季度月
*
* @param date
* @return
*/
public static Date[] getSeasonDate(Date date) {
Date[] season = new Date[3];
Calendar c = Calendar.getInstance();
int nSeason = getSeason(date);
if (nSeason == 1) {// 第一季度
c.set(Calendar.MONTH, Calendar.JANUARY);
season[0] = c.getTime();
c.set(Calendar.MONTH, Calendar.FEBRUARY);
season[1] = c.getTime();
c.set(Calendar.MONTH, Calendar.MARCH);
season[2] = c.getTime();
} else if (nSeason == 2) {// 第二季度
c.set(Calendar.MONTH, Calendar.APRIL);
season[0] = c.getTime();
c.set(Calendar.MONTH, Calendar.MAY);
season[1] = c.getTime();
c.set(Calendar.MONTH, Calendar.JUNE);
season[2] = c.getTime();
} else if (nSeason == 3) {// 第三季度
c.set(Calendar.MONTH, Calendar.JULY);
season[0] = c.getTime();
c.set(Calendar.MONTH, Calendar.AUGUST);
season[1] = c.getTime();
c.set(Calendar.MONTH, Calendar.SEPTEMBER);
season[2] = c.getTime();
} else if (nSeason == 4) {// 第四季度
c.set(Calendar.MONTH, Calendar.OCTOBER);
season[0] = c.getTime();
c.set(Calendar.MONTH, Calendar.NOVEMBER);
season[1] = c.getTime();
c.set(Calendar.MONTH, Calendar.DECEMBER);
season[2] = c.getTime();
}
return season;
}
/**
* 获取当前季度
* 1 第一季度 2 第二季度 3 第三季度 4 第四季度
*
* @param date
* @return
*/
public static int getSeason(Date date) {
int season = 0;
Calendar c = Calendar.getInstance();
c.setTime(date);
int month = c.get(Calendar.MONTH);
switch (month) {
case Calendar.JANUARY:
case Calendar.FEBRUARY:
case Calendar.MARCH:
season = 1;
break;
case Calendar.APRIL:
case Calendar.MAY:
case Calendar.JUNE:
season = 2;
break;
case Calendar.JULY:
case Calendar.AUGUST:
case Calendar.SEPTEMBER:
season = 3;
break;
case Calendar.OCTOBER:
case Calendar.NOVEMBER:
case Calendar.DECEMBER:
season = 4;
break;
default:
break;
}
return season;
}
/**
* 取得月第一天
*
* @param date
* @return
*/
public static Date getFirstDateOfMonth(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
c.set(Calendar.DAY_OF_MONTH, c.getActualMinimum(Calendar.DAY_OF_MONTH));
return c.getTime();
}
/**
* 取得月最后一天
*
* @param date
* @return
*/
public static Date getLastDateOfMonth(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
c.set(Calendar.DAY_OF_MONTH, c.getActualMaximum(Calendar.DAY_OF_MONTH));
return c.getTime();
}
/**
* 获取指定日期所属的月份
* @param date
* @return
*/
public static int getMonthInt(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.MONTH) + 1;
}
/**
* 获取指定日期所属的年
* @param date
* @return
*/
public static int getYearInt(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.YEAR);
}
/**
* 获取当前天的前n天
* @param n
* @return
*/
public static Date getTodayPreNDay(int n) {
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.DATE, -n);
return calendar.getTime();
}
/**
* 通过Calendar获取今天的日期
* @return Date
*/
public static Date getTodayFromCalendar(){
Calendar calendar = Calendar.getInstance();
return calendar.getTime();
}
/**
* 通过pattern设定日期的格式
* @return
*/
public static String getTodayStr() { return getTodayStr(YYYYMMDD); }
public static String getTodayStr(String pattern) {
Date NowDate = new Date();
simpledateformat formatter = new SimpleDateFormat(pattern);
return formatter.format(NowDate);
}
/**
* 字符串转date
* 根据字符串格式的日期和期望要的格式生成date日期
* @param strDate
* @return
*/
public static Date parseStrToDate(String strDate) {
return parseStrToDate(strDate, null);
}
public static Date parseStrToDate(String strDate, String pattern) {
Date date = null;
try {
if (pattern == null) {
pattern = YYYYMMDD;
}
SimpleDateFormat format = new SimpleDateFormat(pattern);
date = format.parse(strDate);
} catch (Exception e) {
e.printstacktrace();
}
return date;
}
/**
* date转字符串
* @param date
* @return
*/
public static String formatDateToStr(Date date) {
return formatDateToStr(date, null);
}
public static String formatDateToStr(Date date, String pattern) {
String strDate = null;
try {
if (pattern == null) {
pattern = YYYYMMDD;
}
SimpleDateFormat format = new SimpleDateFormat(pattern);
strDate = format.format(date);
} catch (Exception e) {
e.printStackTrace();
}
return strDate;
}
}
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