日历工具CalendarUtil
==============================Calendar日历工具类
import java.math.BigDecimal; import java.util.ArrayList; import java.util.Calendar; import java.util.Date; import java.util.List; public class CalendarUtil { /** * 获取开始日和结束日之前的天数（保留2位小数，超过2位直接舍弃） * @param startDate * @param endDate * @return */ public static BigDecimal bigDeciBetweenDays(Date startDate, Date endDate){ BigDecimal startTime = new BigDecimal(startDate.getTime()); BigDecimal endTime = new BigDecimal(endDate.getTime()); BigDecimal subtract = endTime.subtract(startTime); //BigDecimal.ROUND_DOWN 直接截取，不进位 return subtract.divide(new BigDecimal(1000*60*60*24), 2, BigDecimal.ROUND_DOWN); } /** * 获取开始日和结束日之间的日期列表（包含开始和结束日） * @param startDate * @param endDate * @return */ public static List<Date> listBetweenDays(Date startDate, Date endDate){ List<Date> dayList = new ArrayList<>(); Calendar startCal = Calendar.getInstance(); startCal.setTime(startDate); Calendar endCal = Calendar.getInstance(); endCal.setTime(endDate); //包含开始日 dayList.add(startDate); while(startCal.before(endCal)) { startCal.add(Calendar.DAY_OF_YEAR, 1); dayList.add(startCal.getTime()); } return dayList; } /********************************************年&天yearDay***********************************************/ /** * 当年的开始和结束日 * @param date * @return */ public static List<Date> startAndEndForYear(Date date){ List<Date> dayList = new ArrayList<>(); dayList.add(startDayForYear(date)); dayList.add(endDayForYear(date)); return dayList; } /** * 当年的结束日 * @param date * @return */ public static Date endDayForYear(Date date) { Calendar instance = Calendar.getInstance(); instance.clear(); instance.setTime(date); instance.add(Calendar.YEAR, 1); instance.set(Calendar.DAY_OF_YEAR, 0);//设置前一年最后一天 return instance.getTime(); } /** * 当年的开始日 * @param date * @return */ public static Date startDayForYear(Date date) { Calendar instance = Calendar.getInstance(); instance.clear(); instance.setTime(date); instance.add(Calendar.YEAR, 0); instance.set(Calendar.DAY_OF_YEAR, 1);//设置当年第一天 return instance.getTime(); } /** * 当年的第几天 * @param date * @return */ public static int dayForYear(Date date) { Calendar instance = Calendar.getInstance(); instance.setTime(date); return instance.get(Calendar.DAY_OF_YEAR); } /********************************************季度&天quarterDay***********************************************/ /** * 当季度的开始和结束日 * @param date * @return */ public static List<Date> startAndEndForQuarter(Date date) { List<Date> dayList = new ArrayList<>(); dayList.add(startDayForQuarter(date)); dayList.add(endDayForQuarter(date)); return dayList; } /** * 当季度的结束日 * @param date * @return */ public static Date endDayForQuarter(Date date) { Calendar instance = Calendar.getInstance(); instance.clear(); instance.setTime(date); int intMonth = instance.get(Calendar.MONTH) + 1; if(intMonth>=1 && intMonth<=3) { instance.set(Calendar.MONTH, 3); }else if(intMonth>=4 && intMonth<=6) { instance.set(Calendar.MONTH, 6); }else if(intMonth>=7 && intMonth<=9) { instance.set(Calendar.MONTH, 9); }else if(intMonth>=10 && intMonth<=12) { instance.set(Calendar.MONTH, 12); } instance.set(Calendar.DAY_OF_MONTH, 0);//设置上季度最后一天 return instance.getTime(); } /** * 当季度的开始日 * @param date * @return */ public static Date startDayForQuarter(Date date) { Calendar instance = Calendar.getInstance(); instance.clear(); instance.setTime(date); int intMonth = instance.get(Calendar.MONTH) + 1; if(intMonth>=1 && intMonth<=3) { instance.set(Calendar.MONTH, 0); }else if(intMonth>=4 && intMonth<=6) { instance.set(Calendar.MONTH, 3); }else if(intMonth>=7 && intMonth<=9) { instance.set(Calendar.MONTH, 6); }else if(intMonth>=10 && intMonth<=12) { instance.set(Calendar.MONTH, 9); } instance.set(Calendar.DAY_OF_MONTH, 1);//设置当月第一天 return instance.getTime(); } /********************************************月&天monthDay***********************************************/ /** * 当月的开始和结束日 * @param date * @return */ public static List<Date> startAndEndForMonth(Date date){ List<Date> dayList = new ArrayList<>(); dayList.add(startDayForMonth(date)); dayList.add(endDayForMonth(date)); return dayList; } /** * 当月的结束日 * @param date * @return */ public static Date endDayForMonth(Date date) { Calendar instance = Calendar.getInstance(); instance.clear(); instance.setTime(date); instance.add(Calendar.MONTH, 1); instance.set(Calendar.DAY_OF_MONTH, 0);//设置上月最后一天 return instance.getTime(); } /** * 当月的开始日 * @param date * @return */ public static Date startDayForMonth(Date date) { Calendar instance = Calendar.getInstance(); instance.clear(); instance.setTime(date); instance.add(Calendar.MONTH, 0); instance.set(Calendar.DAY_OF_MONTH, 1);//设置当月第一天 return instance.getTime(); } /** * 当月的第几天 * @param date * @return */ public static int dayForMonth(Date date) { Calendar instance = Calendar.getInstance(); instance.setTime(date); return instance.get(Calendar.DAY_OF_MONTH); } /********************************************周&年weekDay***********************************************/ /** * 本周的开始和结束日 * @param date * @return */ public static List<Date> startAndEndForWeek(Date date){ List<Date> dayList = new ArrayList<>(); dayList.add(startDayForWeek(date)); dayList.add(endDayForWeek(date)); return dayList; } /** * 本周的结束日 * @param date * @return */ public static Date endDayForWeek(Date date) { Calendar instance = Calendar.getInstance(); instance.clear(); instance.setTime(date); int intWeek = dayForWeek(date); instance.add(Calendar.DAY_OF_WEEK, 7-intWeek); return instance.getTime(); } /** * 本周的开始日 * @param date * @return */ public static Date startDayForWeek(Date date) { Calendar instance = Calendar.getInstance(); instance.clear(); instance.setTime(date); int intWeek = dayForWeek(date); instance.add(Calendar.DAY_OF_WEEK, 1-intWeek); return instance.getTime(); } /** * 根据日期获取本周第几天 * @param date * @return */ public static int dayForWeek(Date date) { Calendar instance = Calendar.getInstance(); instance.setTime(date); //Week，从周日作为第一天，开始计算，因此需要减一 int intWeek = instance.get(Calendar.DAY_OF_WEEK)-1; return intWeek; } }
==============================Calendar日历工具测试类
/** * 获取开始日和结束日之前的天数（保留2位小数，超过2位直接舍弃） */ @Test public void test_bigDeciBetweenDays() { Date startDate = DateParseUtil.parseDate("20211226", DateParseUtil.DATE_PATTERN_yyyyMMdd); Date endDate = DateParseUtil.parseDate("20211227", DateParseUtil.DATE_PATTERN_yyyyMMdd); BigDecimal bigDeciBetweenDays = CalendarUtil.bigDeciBetweenDays(startDate, endDate); System.out.println(bigDeciBetweenDays); } /** * 获取开始日和结束日之间的日期列表（包含开始和结束日） */ @Test public void test_listBetweenDays() { Date startDate = DateParseUtil.parseDate("20211226", DateParseUtil.DATE_PATTERN_yyyyMMdd); Date endDate = DateParseUtil.parseDate("20211227", DateParseUtil.DATE_PATTERN_yyyyMMdd); List<Date> dayList = CalendarUtil.listBetweenDays(startDate, endDate); for(Date date : dayList) { System.out.println(DateFormatUtil.formatDate(date, DateFormatUtil.DATE_PATTERN_yyyyMMdd_HHmmss)); } } /********************************************年&天yearDay***********************************************/ /** * 指定日期的本年开始和结束日 */ @Test public void test_startAndEndForYear() { Date curDate = DateParseUtil.parseDate("20211227", DateParseUtil.DATE_PATTERN_yyyyMMdd); List<Date> dayList = CalendarUtil.startAndEndForYear(curDate); for(Date date : dayList) { System.out.println(DateFormatUtil.formatDate(date, DateFormatUtil.DATE_PATTERN_yyyyMMdd_HHmmss)); } } /** * 指定日期的本年最后一天 */ @Test public void test_endDayForYear() { Date curDate = DateParseUtil.parseDate("20211227", DateParseUtil.DATE_PATTERN_yyyyMMdd); Date startDay = CalendarUtil.endDayForYear(curDate); System.out.println(DateFormatUtil.formatDate(startDay, DateFormatUtil.DATE_PATTERN_yyyyMMdd_HHmmss)); } /** * 指定日期的本年第一天 */ @Test public void test_startDayForYear() { Date curDate = DateParseUtil.parseDate("20211224", DateParseUtil.DATE_PATTERN_yyyyMMdd); Date startDay = CalendarUtil.startDayForYear(curDate); System.out.println(DateFormatUtil.formatDate(startDay, DateFormatUtil.DATE_PATTERN_yyyyMMdd_HHmmss)); } /** * 根据日期获取本年第几天 */ @Test public void test_dayForYear() { Date curDate = new Date(); int intMonth = CalendarUtil.dayForYear(curDate); System.out.println(intMonth); } /********************************************季度&天quarterDay***********************************************/ /** * 指定日期的本季度开始和结束日 */ @Test public void test_startAndEndForQuarter() { Date curDate = DateParseUtil.parseDate("20211227", DateParseUtil.DATE_PATTERN_yyyyMMdd); List<Date> dayList = CalendarUtil.startAndEndForQuarter(curDate); for(Date date : dayList) { System.out.println(DateFormatUtil.formatDate(date, DateFormatUtil.DATE_PATTERN_yyyyMMdd_HHmmss)); } } /** * 指定日期的本季度最后一天 */ @Test public void test_endDayForQuarter() { Date curDate = DateParseUtil.parseDate("20211227", DateParseUtil.DATE_PATTERN_yyyyMMdd); Date startDay = CalendarUtil.endDayForQuarter(curDate); System.out.println(DateFormatUtil.formatDate(startDay, DateFormatUtil.DATE_PATTERN_yyyyMMdd_HHmmss)); } /** * 指定日期的本季度第一天 */ @Test public void test_startDayForQuarter() { Date curDate = DateParseUtil.parseDate("20211224", DateParseUtil.DATE_PATTERN_yyyyMMdd); Date startDay = CalendarUtil.startDayForQuarter(curDate); System.out.println(DateFormatUtil.formatDate(startDay, DateFormatUtil.DATE_PATTERN_yyyyMMdd_HHmmss)); } /********************************************月&天monthDay***********************************************/ /** * 指定日期的本月开始和结束日 */ @Test public void test_startAndEndForMonth() { Date curDate = DateParseUtil.parseDate("20211227", DateParseUtil.DATE_PATTERN_yyyyMMdd); List<Date> dayList = CalendarUtil.startAndEndForMonth(curDate); for(Date date : dayList) { System.out.println(DateFormatUtil.formatDate(date, DateFormatUtil.DATE_PATTERN_yyyyMMdd_HHmmss)); } } /** * 指定日期的本月最后一天 */ @Test public void test_endDayForMonth() { Date curDate = DateParseUtil.parseDate("20211227", DateParseUtil.DATE_PATTERN_yyyyMMdd); Date startDay = CalendarUtil.endDayForMonth(curDate); System.out.println(DateFormatUtil.formatDate(startDay, DateFormatUtil.DATE_PATTERN_yyyyMMdd_HHmmss)); } /** * 指定日期的本月第一天 */ @Test public void test_startDayForMonth() { Date curDate = DateParseUtil.parseDate("20211224", DateParseUtil.DATE_PATTERN_yyyyMMdd); Date startDay = CalendarUtil.startDayForMonth(curDate); System.out.println(DateFormatUtil.formatDate(startDay, DateFormatUtil.DATE_PATTERN_yyyyMMdd_HHmmss)); } /** * 根据日期获取本月第几天 */ @Test public void test_dayForMonth() { Date curDate = new Date(); int intMonth = CalendarUtil.dayForMonth(curDate); System.out.println(intMonth); } /********************************************周&年weekDay***********************************************/ /** * 指定日期的当周开始和结束日 */ @Test public void test_startAndEndForWeek() { Date curDate = DateParseUtil.parseDate("20211227", DateParseUtil.DATE_PATTERN_yyyyMMdd); List<Date> dayList = CalendarUtil.startAndEndForWeek(curDate); for(Date date : dayList) { System.out.println(DateFormatUtil.formatDate(date, DateFormatUtil.DATE_PATTERN_yyyyMMdd_HHmmss)); } } /** * 指定日期的当周最后一天 */ @Test public void test_endDayForWeek() { Date curDate = DateParseUtil.parseDate("20211227", DateParseUtil.DATE_PATTERN_yyyyMMdd); Date startDay = CalendarUtil.endDayForWeek(curDate); System.out.println(DateFormatUtil.formatDate(startDay, DateFormatUtil.DATE_PATTERN_yyyyMMdd_HHmmss)); } /** * 指定日期的当周第一天 */ @Test public void test_startDayForWeek() { Date curDate = DateParseUtil.parseDate("20211224", DateParseUtil.DATE_PATTERN_yyyyMMdd); Date startDay = CalendarUtil.startDayForWeek(curDate); System.out.println(DateFormatUtil.formatDate(startDay, DateFormatUtil.DATE_PATTERN_yyyyMMdd_HHmmss)); } /** * 根据日期获取周几 */ @Test public void test_dayForWeek() { Date curDate = new Date();//周一 int intWeek = CalendarUtil.dayForWeek(curDate); System.out.println(intWeek); //若 周一，则返回 1 }
