Java获取各种常用时间

package com.utils.date;import java.text.ParsePosition;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;public class TimeTest {private static int weeks = 0; // 用来全局控制，上一周，本周，下一周的周数变化private static int MaxDate; // 一个月最大天数/*       字母    含义                            示例y   Year                1996;96             哪一年M   Month in year  July;Jul;07           一年中的哪一月m   Minute in hour      30                  一个小时中的第几分钟w   Week in year        27                 一年中的第几个星期W   Week in month       2                    一个月中的第几个星期D   Day in year         189               一年中的第几天d   Day in month        10                  一个月中的第几天H   Hour in day (0-23)0                    一天中的第几个小时（24小时制）h   Hour in am/pm (1-12)    12                  一天中上午、下午的第几个小时（12小时制）S   Millisecond             978                毫秒数s   Second in minute        55                  一分钟的第几秒 * */public static void main(String[] args) {System.out.println("当前日期： " + getNowDate());System.out.println("本周一日期： " + getMondayOfCurrentWeek());System.out.println("本周日日期： " + getSundayOfCurrentWeek());System.out.println("上周一日期： " + getMondayOfPreviousWeek());System.out.println("上周日日期： " + getSundayOfPreviousWeek());System.out.println("下周一日期： " + getMondayOfNextWeek());System.out.println("下周日日期： " + getSundayOfNextWeek());System.out.println("当月第一天： " + getFirstDayOfCurrentMonth());System.out.println("当月最后一天： " + getLastDayOfCurrentMonth());System.out.println("上月第一天： " + getFirstDayOfPreviousMonth());System.out.println("上月最后一天：" + getLastDayOfpreviousMonth());System.out.println("下月第一天：" + getFirstDayOfNextMonth());System.out.println("下月最后一天：" + getLastDayOfNextMonth());System.out.println("获得本季度： " + getThisSeasonTime(2));System.out.println("获得某年某月的最后一天： " + getLastDayOfMonth(2014, 2));System.out.println("获得两个日期间的间隔天数: "+ getTwoDay("2014-2-14", "2014-2-12"));System.out.println("根据一个日期，返回当天是星期几: " + getWeek("2014-2-20"));}/** * 将短时间格式字符串转换为时间类型 *  * @return */public static Date str2Date(String str) {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Date date = sdf.parse(str, new ParsePosition(0));return date;}/** * 将时间类型转换为短时间格式字符串 *  * @return */public static String date2Str(Date date) {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");String str = sdf.format(date);return str;}// 获取当天日期public static String getNowDate() {Date date = new Date();return date2Str(date);}// 当前日期与本周日相差天数public static int getMondayPlus() {Calendar c = Calendar.getInstance();// 今天是本周的第几天，星期日为第一天// 若星期一为第一天则减去1int dayOfWeek = c.get(Calendar.DAY_OF_WEEK) - 1;if (dayOfWeek == 0) {return 0;} else {return 1 - dayOfWeek;}}// 本周一日期public static String getMondayOfCurrentWeek() {int mondayPlus = getMondayPlus();Calendar c = Calendar.getInstance();c.add(Calendar.DATE, mondayPlus);return date2Str(c.getTime());}// 本周日日期public static String getSundayOfCurrentWeek() {int mondayPlus = getMondayPlus();Calendar c = Calendar.getInstance();c.add(Calendar.DATE, mondayPlus + 6);return date2Str(c.getTime());}// 上周一日期public static String getMondayOfPreviousWeek() {weeks = -1;int mondayPlus = getMondayPlus();Calendar c = Calendar.getInstance();c.add(Calendar.DATE, mondayPlus + weeks * 7);return date2Str(c.getTime());}// 上周日日期public static String getSundayOfPreviousWeek() {weeks = -1;int mondayPlus = getMondayPlus();Calendar c = Calendar.getInstance();c.add(Calendar.DATE, mondayPlus + weeks);return date2Str(c.getTime());}// 下周一日期public static String getMondayOfNextWeek() {weeks = 1;int mondayPlus = getMondayPlus();Calendar c = Calendar.getInstance();c.add(Calendar.DATE, mondayPlus + weeks + 6);return date2Str(c.getTime());}// 下周日日期public static String getSundayOfNextWeek() {weeks = 1;int mondayPlus = getMondayPlus();Calendar c = Calendar.getInstance();c.add(Calendar.DATE, mondayPlus + weeks * 7 + 6);return date2Str(c.getTime());}// 与本月最后一天相差天数public static int getMonthPlus() {Calendar c = Calendar.getInstance();// 当前月份中的第几天int dayOfMonth = c.get(Calendar.DAY_OF_MONTH);c.set(Calendar.DATE, 1); // 日期设置为当月第一天c.roll(Calendar.DATE, -1); // 日期回滚一天为本月最后一天MaxDate = c.get(Calendar.DATE);if (dayOfMonth == 1) {return -MaxDate;} else {return dayOfMonth - MaxDate;}}// 当月第一天public static String getFirstDayOfCurrentMonth() {Calendar c = Calendar.getInstance();c.set(Calendar.DATE, 1); // 设为当前月的1号String str = date2Str(c.getTime());return str;}// 计算当月最后一天public static String getLastDayOfCurrentMonth() {Calendar c = Calendar.getInstance();c.set(Calendar.DATE, 1); // 设为当前月的1号c.add(Calendar.MONTH, 1); // 加一个月，变为下月的1号c.add(Calendar.DATE, -1); // 减去一天，变为当月最后一天String str = date2Str(c.getTime());return str;}// 上月第一天public static String getFirstDayOfPreviousMonth() {Calendar c = Calendar.getInstance();c.set(Calendar.DATE, 1); // 设为当前月的1号c.add(Calendar.MONTH, -1); // 减一个月，变为上月的1号String str = date2Str(c.getTime());return str;}// 上月最后一天public static String getLastDayOfpreviousMonth() {Calendar c = Calendar.getInstance();c.set(Calendar.DATE, 1);c.add(Calendar.DATE, -1);String str = date2Str(c.getTime());return str;}// 下月第一天public static String getFirstDayOfNextMonth() {Calendar c = Calendar.getInstance();c.set(Calendar.DATE, 1);c.add(Calendar.MONTH, 1);String str = date2Str(c.getTime());return str;}// 下月最后一天public static String getLastDayOfNextMonth() {Calendar c = Calendar.getInstance();c.set(Calendar.DATE, 1);// c.add(Calendar.MONTH, 1);// c.roll(Calendar.DATE, -1);c.add(Calendar.MONTH, 2);c.add(Calendar.DATE, -1);String str = date2Str(c.getTime());return str;}// 获得本季度public static String getThisSeasonTime(int month) {int array[][] = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 }, { 10, 11, 12 } };int season = 1;if (month >= 1 && month <= 3) {season = 1;}if (month >= 4 && month <= 6) {season = 2;}if (month >= 7 && month <= 9) {season = 3;}if (month >= 10 && month <= 12) {season = 4;}int start_month = array[season - 1][0];int end_month = array[season - 1][2];Date date = new Date();SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式String years = dateFormat.format(date);int years_value = Integer.parseInt(years);int start_days = 1;int end_days = getLastDayOfMonth(years_value, end_month);String seasonDate = years_value + "-" + start_month + "-" + start_days+ "----" + years_value + "-" + end_month + "-" + end_days;return seasonDate;}/** * 获取某年某月的最后一天 *  * @param year *            年 * @param month *            月 * @return 天 */public static int getLastDayOfMonth(int year, int month) {if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8|| month == 10 || month == 12) {return 31;}if (month == 4 || month == 6 || month == 9 || month == 11) {return 30;}if (month == 2) {if (isLeapYear(year)) {return 29;} else {return 28;}}return 0;}// 是否为闰年public static boolean isLeapYear(int year) {return (year % 4 == 0 && year % 100 != 0) || year % 400 == 0;}// 获得两个日期间的间隔天数public static String getTwoDay(String sj1, String sj2) {Date date1 = str2Date(sj1);Date date2 = str2Date(sj2);long day = (date1.getTime() - date2.getTime()) / (24 * 60 * 60 * 1000);return day + "";}// 根据一个日期，返回当天是星期几public static String getWeek(String dateStr) {Date date = str2Date(dateStr);// Calendar c = Calendar.getInstance();// c.setTime(date);// week取值1-7，1为星期日// int week = c.get(Calendar.DAY_OF_WEEK);String s = new SimpleDateFormat("EEEE").format(date);return s;}}