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 = ();
//(, 1); //一年后的今天为基准（add具有累加效果）
//(, 1);// 同理换成下个月的今天（add具有累加效果）
(, 2000); //直接覆盖年这个字段，其他的去默认值
("现在是" + () + "年");
(2018, 7, 1);//直接覆盖年月日这个字段，其他的去默认值
int year = (); // 获取年
int 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.DAY_OF_MONTH); // 获取日
int hour = (); // 获取时
// int hour = (Calendar.HOUR_OF_DAY); // 24小时表示
int minute = ();// 获取分
int second = ();// 获取秒
int weekday = (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）
("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{
(formatDateToStr(getTodayPreNDay(0)));
(formatDateToStr(getTodayPreNDay(1)));
(formatDateToStr(getTodayPreNDay(31)));
(getMonthInt(new Date()));
(getYearInt(new Date()));
(formatDateToStr(getFirstDateOfMonth(new Date())));//月初
(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 = ();
(date);
int month = ();
if (month == || month ==
|| month == || month == ) {// 季度第一个月
day = getPassDayOfMonth(seasonDates[0]);
} else if (month == || month ==
|| month == || month == ) {// 季度第二个月
day = getDayOfMonth(seasonDates[0])
+ getPassDayOfMonth(seasonDates[1]);
} else if (month == || month ==
|| month == || month == ) {// 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 = ();
(date);
return (Calendar.DAY_OF_MONTH);
}
/**
* 取得月天数
*
* @param date
* @return
*/
public static int getDayOfMonth(Date date) {
Calendar c = ();
(date);
return (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 = ();
int nSeason = getSeason(date);
if (nSeason == 1) {// 第一季度
(, );
season[0] = ();
(, );
season[1] = ();
(, );
season[2] = ();
} else if (nSeason == 2) {// 第二季度
(, );
season[0] = ();
(, );
season[1] = ();
(, );
season[2] = ();
} else if (nSeason == 3) {// 第三季度
(, );
season[0] = ();
(, );
season[1] = ();
(, );
season[2] = ();
} else if (nSeason == 4) {// 第四季度
(, );
season[0] = ();
(, );
season[1] = ();
(, );
season[2] = ();
}
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 = ();
(date);
int month = ();
switch (month) {
case :
case :
case :
season = 1;
break;
case :
case :
case :
season = 2;
break;
case :
case :
case :
season = 3;
break;
case :
case :
case :
season = 4;
break;
default:
break;
}
return season;
}
/**
* 取得月第一天
*
* @param date
* @return
*/
public static Date getFirstDateOfMonth(Date date) {
Calendar c = ();
(date);
(Calendar.DAY_OF_MONTH, (Calendar.DAY_OF_MONTH));
return ();
}
/**
* 取得月最后一天
*
* @param date
* @return
*/
public static Date getLastDateOfMonth(Date date) {
Calendar c = ();
(date);
(Calendar.DAY_OF_MONTH, (Calendar.DAY_OF_MONTH));
return ();
}
/**
* 获取指定日期所属的月份
* @param date
* @return
*/
public static int getMonthInt(Date date) {
Calendar c = ();
(date);
return () + 1;
}
/**
* 获取指定日期所属的年
* @param date
* @return
*/
public static int getYearInt(Date date) {
Calendar c = ();
(date);
return ();
}
/**
* 获取当前天的前n天
* @param n
* @return
*/
public static Date getTodayPreNDay(int n) {
Calendar calendar = ();
(, -n);
return ();
}
/**
* 通过Calendar获取今天的日期
* @return Date
*/
public static Date getTodayFromCalendar(){
Calendar calendar = ();
return ();
}
/**
* 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 (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 = (strDate);
} catch (Exception e) {
();
}
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 = (date);
} catch (Exception e) {
();
}
return strDate;
}
}
